windows API(VC++编程 中IsRectEmpty(&llpRect)的问题

myselfdragon 2009-08-30 08:26:52
int xPos, yPos;

int xp,yp;
POINT pt;

HBITMAP hBitmap;
LPCSTR lpszFileName;
int saxp;
int sayp;

int flag=0;//用于鼠标弹起
int tag=0;

//int savexpos;
//int saveypos;
RECT llpRect;
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;


//////////////////////////////////////

case WM_LBUTTONDOWN:
{

if(!tag)
{

xPos = LOWORD(lParam);
yPos = HIWORD(lParam);


tag=1;
llpRect.left=xPos;
llpRect.top=yPos;

}



//flag=1;
}
break;


//框没的时候，有的时候就是不操作即可
case WM_LBUTTONUP:
{
saxp=xp;
sayp=yp;
flag=1;
InvalidateRect(hWnd,NULL,true);
//Rectangle(hdc,xPos,yPos,xp,yp);

}
break;



case WM_MOUSEMOVE:
{


{
if(flag)
{
xp=saxp;
yp=sayp;
llpRect.right=xp;
llpRect.bottom=yp;

}

else
{

xp=LOWORD(lParam);
yp=HIWORD(lParam);
InvalidateRect(hWnd,NULL,true);

}

}


//InvalidateRect(hWnd,NULL,true);

}

break;

case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
RECT rt;
GetClientRect(hWnd, &rt);





if(xPos&&yPos)

Rectangle(hdc,xPos,yPos,xp,yp);

DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);


EndPaint(hWnd, &ps);
break;

case WM_LBUTTONDBLCLK:
{

if (IsRectEmpty(&llpRect))
return NULL;

请注意问题我在执行if (IsRectEmpty(&llpRect))，怎么走了return NULL;不应该走啊，请高手帮调试一下

int a=5;
a=a+5;
printf("%d",a);


}

break;





//////////////////////////////////////////////////////////////////

case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
...全文
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schlafenhamster 2009-08-31
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已改好，请告诉如何给你？
schlafenhamster 2009-08-31
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问题：
1.不要用“dblclick”，用right button down，否则选择的rect会变。
2.“dblclick”，用做选择区清除。
3.HBITMAP CopyScreenToBitmap(CRect &Rect,HWND hwnd)中要坐标变换：//去const
MapWindowPoints(hwnd,NULL,(POINT *)&Rect,2);

myselfdragon 2009-08-31
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RECT llpRect;



LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

	int wmId, wmEvent;

	PAINTSTRUCT ps;

	HDC hdc;

	TCHAR szHello[MAX_LOADSTRING];

	LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);



	switch (message) 

	{

		case WM_COMMAND:

			wmId    = LOWORD(wParam); 

			wmEvent = HIWORD(wParam); 

			// Parse the menu selections:

			switch (wmId)

			{

				case IDM_ABOUT:

				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);

				   break;

				case IDM_EXIT:

				   DestroyWindow(hWnd);

				   break;

				default:

				   return DefWindowProc(hWnd, message, wParam, lParam);

			}

			break;

	



 //////////////////////////////////////

	

		case  WM_LBUTTONDOWN:

				{

				

				   if(!tag)

				   {

				    

					xPos = LOWORD(lParam); 

					yPos = HIWORD(lParam);

                   // savexpos=



                    tag=1;

					//llpRect->left=xPos;

					//llpRect->top=yPos;



                    llpRect.left=xPos;

                    //llpRect.right=xPos;

				    llpRect.top=yPos;

					

				   }



					



	                //flag=1;

				}

				break;

	

       

       //框没的时候，有的时候就是不操作即可

        case WM_LBUTTONUP:

			{           

				        //xPos=xp=0;

						//yPos=yp=0;

				        saxp=xp;

                        sayp=yp;

						flag=1;

					    InvalidateRect(hWnd,NULL,true);

                        //Rectangle(hdc,xPos,yPos,xp,yp);

              		

            }

            break;

       

       



        case WM_MOUSEMOVE:

			{

			   

	      

			  {	  

				if(flag)

				{

				   xp=saxp;

				   yp=sayp;

				  // llpRect->right=xp;

				 //  llpRect->bottom=yp;

				  llpRect.right=xp;

                 // llpRect.left=xp;

				  llpRect.bottom=yp;

                   /*

				  int saveleft;

				  int savetop;



				  if(llpRect.left>llpRect.right)

				  {

				      saveleft=llpRect.left;

					  llpRect.left=llpRect.right;



				      llpRect.right=saveleft;

				  }





				  if(llpRect.top>llpRect.bottom)

				  {

				      savetop=llpRect.top;

					  llpRect.top=llpRect.bottom;



				      llpRect.bottom=savetop;

				  }*/













				

				}

                

				else

				{



					xp=LOWORD(lParam); 

					yp=HIWORD(lParam);

				}



			  }



				 

				InvalidateRect(hWnd,NULL,true);

			

			}

			

			break;



       case WM_PAINT:

			hdc = BeginPaint(hWnd, &ps);

			// TODO: Add any drawing code here...

			RECT rt;

			GetClientRect(hWnd, &rt);



		  

			

			

			

            if(xPos&&yPos)



            Rectangle(hdc,xPos,yPos,xp,yp);

            

			DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);

			

			

			EndPaint(hWnd, &ps);

			break;

			

	   case WM_LBUTTONDBLCLK:

		   {

            // int i=1;//CopyScreenToBitmap(lpRect);

		          int saveleft;

				  int savetop;

                  

				  if(llpRect.left>llpRect.right)

				  {

				      saveleft=llpRect.left;

					  llpRect.left=llpRect.right;



				      llpRect.right=saveleft;

				  }





				 if(llpRect.top>llpRect.bottom)

				  {

				      savetop=llpRect.top;

					  llpRect.top=llpRect.bottom;



				      llpRect.bottom=savetop;

				  }

               

				  

				  

				  

			    /*int savebottom;

                

                if(llpRect.bottom>llpRect.top)

				{

				        savebottom=llpRect.bottom;

						llpRect.bottom=llpRect.top;

                        llpRect.top=savebottom;

				

				}*/

             ////////////////////////////////////////  

             

             //llpRect.top=llpRect.bottom;

             

            // llpRect.bottom=llpRect.bottom-(savetop-llpRect.bottom);

			 ////////////////////////////////////////









                                          

             hbitmap=CopyScreenToBitmap(llpRect,hWnd);

		                               

            // SaveBitmapToFile(CopyScreenToBitmap(llpRect,hWnd),"temp.bmp"); 

			 SaveBitmapToFile(hbitmap,"temp.bmp"); 

			 CloseWindow(hWnd);

			  

		   }

     





		    break;

		

	   case WM_RBUTTONDOWN:

		    CloseWindow(hWnd);

			break;





		

//////////////////////////////////////////////////////////////////



		case WM_DESTROY:

			PostQuitMessage(0);

			break;

		default:

			return DefWindowProc(hWnd, message, wParam, lParam);

   }

   return 0;

}



// Mesage handler for about box.

LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)

{

	switch (message)

	{

		case WM_INITDIALOG:

				return TRUE;



		case WM_COMMAND:

			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 

			{

				EndDialog(hDlg, LOWORD(wParam));

				return TRUE;

			}

			break;

	}

    return FALSE;

}
myselfdragon 2009-08-31
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HBITMAP CopyScreenToBitmap(const RECT lpRect,HWND hWnd)

{   

	//HWND hWnd;

	HDC        hScrDC, hMemDC;      

	HBITMAP   hOldBitmap,hBitmap;   

	int        nX, nY, nX2, nY2;      

	int        nWidth, nHeight;      

	int        xScrn, yScrn;         

	if (IsRectEmpty(&lpRect))

		return NULL;

	hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);

	hMemDC = CreateCompatibleDC(hScrDC);

	nX = lpRect.left;

	nY = lpRect.top;

	nX2 = lpRect.right;

	nY2 = lpRect.bottom;

	xScrn = GetDeviceCaps(hScrDC, HORZRES);

	yScrn = GetDeviceCaps(hScrDC, VERTRES);

	if (nX < 0)    nX = 0;

	if (nY < 0)   nY = 0;

	if (nX2 > xScrn)  nX2 = xScrn;

	if (nY2 > yScrn)  nY2 = yScrn;

	nWidth = nX2 - nX;

	nHeight = nY2 - nY;

	hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);

	hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);

	ShowWindow(hWnd,SW_HIDE);

	//BitBlt(hMemDC, 0, 0, nWidth, nHeight,hScrDC, nX, nY, SRCCOPY);

    BitBlt(hMemDC, 0,0, nWidth, nHeight,hScrDC,nX, nY, SRCCOPY);

	hBitmap =(HBITMAP)SelectObject(hMemDC, hOldBitmap);

	DeleteDC(hScrDC);

	DeleteDC(hMemDC);

	ShowWindow(hWnd,SW_SHOW);

	return hBitmap;

}      







///////



BOOL SaveBitmapToFile(HBITMAP hBitmap, LPCSTR lpszFileName)

{

HDC hDC; 

//设备描述表

int iBits; 

//当前显示分辨率下每个像素所占字节数

WORD wBitCount; 

//位图中每个像素所占字节数

//定义调色板大小， 位图中像素字节大小 ， 位图文件大小 ， 写入文件字节数

DWORD dwPaletteSize=0,dwBmBitsSize,dwDIBSize, dwWritten;

BITMAP Bitmap; 

//位图属性结构

BITMAPFILEHEADER bmfHdr; 

//位图文件头结构

BITMAPINFOHEADER bi; 

//位图信息头结构 

//LPBITMAPINFOHEADER lpbi; 

BITMAPINFOHEADER  *lpbi;



//指向位图信息头结构

HANDLE fh, hDib, hPal;

HPALETTE hOldPal=NULL;

//定义文件，分配内存句柄，调色板句柄



//计算位图文件每个像素所占字节数

hDC = CreateDC("DISPLAY",NULL,NULL,NULL);

iBits = GetDeviceCaps(hDC, BITSPIXEL) * 

GetDeviceCaps(hDC, PLANES);

DeleteDC(hDC);

if (iBits <= 1)

wBitCount = 1;

else if (iBits <= 4)

wBitCount = 4;

else if (iBits <= 8)

wBitCount = 8;

else if (iBits <= 24)

wBitCount = 24;

else

wBitCount = 32;

//计算调色板大小

if (wBitCount <= 8)

dwPaletteSize=(1<<wBitCount)*sizeof(RGBQUAD);



//设置位图信息头结构

GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);



//hBitmap=CreateBitmapIndirect(&Bitmap);

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = Bitmap.bmWidth;

bi.biHeight = Bitmap.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = wBitCount;

bi.biCompression = BI_RGB;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrUsed = 0;

bi.biClrImportant = 0;



dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;

						//为位图内容分配内存



						/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx 

						//每个扫描行所占的字节数应该为4的整数倍，具体算法为:

						int biWidth = (Bitmap.bmWidth*wBitCount) / 32;

						if((Bitmap.bmWidth*wBitCount) % 32)

						biWidth++; //不是整数倍的加1

						biWidth *= 4;//到这里，计算得到的为每个扫描行的字节数。

						dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小

						xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/





hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));

lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);

//先不要

         //有问题*lpbi = bi;

//先不写，因为上面的那就话已经对其赋值了lpbi=new( BITMAPINFOHEADER);

*lpbi =  bi;

//lpbi=&bi;

// 处理调色板 

hPal = GetStockObject(DEFAULT_PALETTE);

if (hPal)

{

hDC = ::GetDC(NULL);

hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE);

RealizePalette(hDC);

}

// 获取该调色板下新的像素值

        //有问题GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);

GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);

//恢复调色板 

if (hOldPal)

{

SelectPalette(hDC, hOldPal, TRUE);

RealizePalette(hDC);

::ReleaseDC(NULL, hDC);

}

//创建位图文件 

fh=CreateFile(lpszFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);

if (fh==INVALID_HANDLE_VALUE)

return FALSE;

// 设置位图文件头

bmfHdr.bfType = 0x4D42; // "BM"

dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize; 

bmfHdr.bfSize = dwDIBSize;

bmfHdr.bfReserved1 = 0;

bmfHdr.bfReserved2 = 0;

bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;

// 写入位图文件头

WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);

// 写入位图文件其余内容

WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize , &dwWritten, NULL); 

//清除 

GlobalUnlock(hDib);

GlobalFree(hDib);

CloseHandle(fh);

return TRUE;



}









///////













//1         ////////////////////



int xPos, yPos;



int xp,yp;

POINT pt;

//LPRECT lpRect;

HBITMAP hbitmap;



LPCSTR lpszFileName;

int saxp;

int sayp;



int flag=0;//用于鼠标弹起

int tag=0;
myselfdragon 2009-08-31
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#include "stdafx.h"

#include "resource.h"

#include<stdio.h>

#include<WINGDI.h>

#define MAX_LOADSTRING 100



// Global Variables:

HINSTANCE hInst;								// current instance

TCHAR szTitle[MAX_LOADSTRING];								// The title bar text

TCHAR szWindowClass[MAX_LOADSTRING];								// The title bar text



// Foward declarations of functions included in this code module:

ATOM				MyRegisterClass(HINSTANCE hInstance);

BOOL				InitInstance(HINSTANCE, int);

LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);

LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);



int APIENTRY WinMain(HINSTANCE hInstance,

                     HINSTANCE hPrevInstance,

                     LPSTR     lpCmdLine,

                     int       nCmdShow)

{

 	// TODO: Place code here.

	MSG msg;

	HACCEL hAccelTable;



	// Initialize global strings

	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);

	LoadString(hInstance, IDC_MOUSEMOVE, szWindowClass, MAX_LOADSTRING);

	MyRegisterClass(hInstance);



	// Perform application initialization:

	if (!InitInstance (hInstance, nCmdShow)) 

	{

		return FALSE;

	}



	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_MOUSEMOVE);



	// Main message loop:

	while (GetMessage(&msg, NULL, 0, 0)) 

	{

		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 

		{

			TranslateMessage(&msg);

			DispatchMessage(&msg);

		}

	}



	return msg.wParam;

}







//

//  FUNCTION: MyRegisterClass()

//

//  PURPOSE: Registers the window class.

//

//  COMMENTS:

//

//    This function and its usage is only necessary if you want this code

//    to be compatible with Win32 systems prior to the 'RegisterClassEx'

//    function that was added to Windows 95. It is important to call this function

//    so that the application will get 'well formed' small icons associated

//    with it.

//

ATOM MyRegisterClass(HINSTANCE hInstance)

{

	WNDCLASSEX wcex;



	wcex.cbSize = sizeof(WNDCLASSEX); 



//	wcex.style			= CS_HREDRAW | CS_VREDRAW;

    wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;

	wcex.lpfnWndProc	= (WNDPROC)WndProc;

	wcex.cbClsExtra		= 0;

	wcex.cbWndExtra		= 0;

	wcex.hInstance		= hInstance;

	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_MOUSEMOVE);

	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);

	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);

	wcex.lpszMenuName	= (LPCSTR)IDC_MOUSEMOVE;

	wcex.lpszClassName	= szWindowClass;

	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);



	return RegisterClassEx(&wcex);

}



//

//   FUNCTION: InitInstance(HANDLE, int)

//

//   PURPOSE: Saves instance handle and creates main window

//

//   COMMENTS:

//

//        In this function, we save the instance handle in a global variable and

//        create and display the main program window.

//

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)

{

   HWND hWnd;



   hInst = hInstance; // Store instance handle in our global variable



   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,

      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);







      ShowWindow(hWnd,SW_SHOWMAXIMIZED);

      SetWindowLong(hWnd,GWL_EXSTYLE,GetWindowLong(hWnd,GWL_EXSTYLE)^0x80000);

      HINSTANCE hInst = LoadLibrary("User32.DLL"); 

      if(hInst) 

      { 

   	   typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD); 

   	   MYFUNC fun = NULL;

   	   //取得SetLayeredWindowAttributes函数指针 

   	   fun=(MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");

   	   if(fun)fun(hWnd,0,30,2); 	//参数1 窗体句柄 参数2 颜色值 参数3透明度 参数4 透明方式 一般用2

   	   FreeLibrary(hInst); 

      }

      

   







   if (!hWnd)

   {

      return FALSE;

   }



   ShowWindow(hWnd, nCmdShow);

   UpdateWindow(hWnd);



   return TRUE;

}
myselfdragon 2009-08-30
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[Quote=引用 15 楼 conry 的回复:]
你把llpRect的值打出来就知道了
你在down的时候llpRect.left=xPos; llpRect.top=yPos;并且设置了标志，就是以后llpRect的左上角坐标不变了，
而在mousemove的时候并且鼠标弹起状态 才给llpRect,right,bottom赋值，那么以后你只要移动鼠标
llpRect,right,bottom就会改变，你双击的时候正好right <=left或者bottom <=top,IsRectEmpty就返回true了
[/Quote]

请问程序中应该怎样改
schlafenhamster 2009-08-30
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这是鼠标移动的方法不一样造成的，当鼠标从右下移到左上时，就会有这个问题，一般可以用NormalizeRect 把它转换过来。
你也可以不用IsRectEmpty，直接判断高和宽。只要高和宽不为0就可以了。
Conry 2009-08-30
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你把llpRect的值打出来就知道了
你在down的时候llpRect.left=xPos; llpRect.top=yPos;并且设置了标志，就是以后llpRect的左上角坐标不变了，
而在mousemove的时候并且鼠标弹起状态 才给llpRect,right,bottom赋值，那么以后你只要移动鼠标
llpRect,right,bottom就会改变，你双击的时候正好right<=left或者bottom<=top,IsRectEmpty就返回true了
myselfdragon 2009-08-30
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我感觉是IsRectEmpty既然返回了Return NULL，则程序中存在问题，要是不写了，也依然有问题啊
schlafenhamster 2009-08-30
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你的llpRect不是正常的RECT是反向的即bottom < top,right<left?如果是CRect可以使用：
NormalizeRect
你也可以不用IsRectEmpty，直接判断高和宽。
myselfdragon 2009-08-30
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up
myselfdragon 2009-08-30
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哦，多谢帮忙
schlafenhamster 2009-08-30
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代码复制了。
myselfdragon 2009-08-30
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UP
MoXiaoRab 2009-08-30
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LZ你贴代码累不累啊
myselfdragon 2009-08-30
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int xPos, yPos;

int xp,yp;
POINT pt;
//LPRECT lpRect;
HBITMAP hBitmap;
LPCSTR lpszFileName;
int saxp;
int sayp;

int flag=0;//用于鼠标弹起
int tag=0;

//int savexpos;
//int saveypos;
//RECT llpRect;

//LPRECT llpRect;
RECT llpRect;
//llpRect=new LPRECT;
//llpRect=new RECT;
//llpRect=malloc(sizeof(RECT));
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;


//////////////////////////////////////

case WM_LBUTTONDOWN:
{

if(!tag)
{

xPos = LOWORD(lParam);
yPos = HIWORD(lParam);
// savexpos=

tag=1;
llpRect.left=xPos;
llpRect.top=yPos;

/*llpRect->left=xPos;
llpRect->top=yPos;*/

}



//flag=1;
}
break;


//框没的时候，有的时候就是不操作即可
case WM_LBUTTONUP:
{
//xPos=xp=0;
//yPos=yp=0;
saxp=xp;
sayp=yp;
flag=1;
InvalidateRect(hWnd,NULL,true);
//Rectangle(hdc,xPos,yPos,xp,yp);

}
break;



case WM_MOUSEMOVE:
{


{
if(flag)
{
xp=saxp;
yp=sayp;
llpRect.right=xp;
llpRect.bottom=yp;
/*
llpRect->right=xp;
llpRect->bottom=yp;*/
}

else
{

xp=LOWORD(lParam);
yp=HIWORD(lParam);
InvalidateRect(hWnd,NULL,true);

}

}


//InvalidateRect(hWnd,NULL,true);

}

break;

case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
RECT rt;
GetClientRect(hWnd, &rt);





if(xPos&&yPos)

Rectangle(hdc,xPos,yPos,xp,yp);

DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);


EndPaint(hWnd, &ps);
break;

case WM_LBUTTONDBLCLK:
{
// int i=1;//CopyScreenToBitmap(lpRect);
//if (IsRectEmpty(&llpRect))
if (IsRectEmpty(&llpRect)){

return NULL;
}

int a=5;
a=a+5;
printf("%d",&a);
// CopyScreenToBitmap(llpRect,hWnd);
SaveBitmapToFile(hBitmap,"lpszFileName");



}

break;





//////////////////////////////////////////////////////////////////

case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}
myselfdragon 2009-08-30
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BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);



ShowWindow(hWnd,SW_SHOWMAXIMIZED);
SetWindowLong(hWnd,GWL_EXSTYLE,GetWindowLong(hWnd,GWL_EXSTYLE)^0x80000);
HINSTANCE hInst = LoadLibrary("User32.DLL");
if(hInst)
{
typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD);
MYFUNC fun = NULL;
//取得SetLayeredWindowAttributes函数指针
fun=(MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");
if(fun)fun(hWnd,0,30,2); //参数1 窗体句柄 参数2 颜色值 参数3透明度 参数4 透明方式 一般用2
FreeLibrary(hInst);
}





if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return

HBITMAP CopyScreenToBitmap( const RECT lpRect,HWND &hWnd1)
{
//HWND hWnd;
HDC hScrDC, hMemDC;
HBITMAP hOldBitmap,hBitmap;
int nX, nY, nX2, nY2;
int nWidth, nHeight;
int xScrn, yScrn;
if (IsRectEmpty(&lpRect))
return NULL;
hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);
hMemDC = CreateCompatibleDC(hScrDC);
nX = lpRect.left;
nY = lpRect.top;
nX2 = lpRect.right;
nY2 = lpRect.bottom;
xScrn = GetDeviceCaps(hScrDC, HORZRES);
yScrn = GetDeviceCaps(hScrDC, VERTRES);
if (nX < 0) nX = 0;
if (nY < 0) nY = 0;
if (nX2 > xScrn) nX2 = xScrn;
if (nY2 > yScrn) nY2 = yScrn;
nWidth = nX2 - nX;
nHeight = nY2 - nY;
hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
ShowWindow(hWnd1,SW_HIDE);
BitBlt(hMemDC, 0, 0, nWidth, nHeight,hScrDC, nX, nY, SRCCOPY);
hBitmap =(HBITMAP)SelectObject(hMemDC, hOldBitmap);
DeleteDC(hScrDC);
DeleteDC(hMemDC);
ShowWindow(hWnd1,SW_SHOW);
return hBitmap;
}

///////

BOOL SaveBitmapToFile(HBITMAP hBitmap, LPCSTR lpszFileName)
{
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
WORD wBitCount;
//位图中每个像素所占字节数
//定义调色板大小， 位图中像素字节大小 ， 位图文件大小 ， 写入文件字节数
DWORD dwPaletteSize=0,dwBmBitsSize,dwDIBSize, dwWritten;
BITMAP Bitmap;
//位图属性结构
BITMAPFILEHEADER bmfHdr;
//位图文件头结构
BITMAPINFOHEADER bi;
//位图信息头结构
LPBITMAPINFOHEADER lpbi;
//指向位图信息头结构
HANDLE fh, hDib, hPal;
HPALETTE hOldPal=NULL;
//定义文件，分配内存句柄，调色板句柄

//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize=(1<<wBitCount)*sizeof(RGBQUAD);

//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;

dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存

/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx
//每个扫描行所占的字节数应该为4的整数倍，具体算法为:
int biWidth = (Bitmap.bmWidth*wBitCount) / 32;
if((Bitmap.bmWidth*wBitCount) % 32)
biWidth++; //不是整数倍的加1
biWidth *= 4;//到这里，计算得到的为每个扫描行的字节数。
dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/


hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
//先不要
lpbi=new BITMAPINFOHEADER;
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh=CreateFile(lpszFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh==INVALID_HANDLE_VALUE)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize , &dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;

}

myselfdragon 2009-08-30
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#include "stdafx.h"
#include "resource.h"
#include<stdio.h>
#define MAX_LOADSTRING 100
#include<stdlib.h>
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text

// Foward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;

// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_MOUSEMOVE, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_MOUSEMOVE);

// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return msg.wParam;
}



//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage is only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

// wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_MOUSEMOVE);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_MOUSEMOVE;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

return RegisterClassEx(&wcex);
}
schlafenhamster 2009-08-30
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Nonzero if CRect is empty; 0 if CRect is not empty
myselfdragon 2009-08-30
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