创建了一个非模态对话框，却无法拖动，求解

[IT保安]

代码:

// 标准的32位程序模板.cpp : Defines the entry point for the application.
//

// 滚动条设计.cpp : Defines the entry point for the application.
//


#include "stdafx.h"
#include <TCHAR.H>
#include <stdio.h>
#include "resource.h"

HWND hDlgModeless;
TCHAR* AppName = TEXT("MyWin");

LRESULT CALLBACK myWndproc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);
bool CALLBACK ColorScrDlg(HWND,UINT,WPARAM,LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	WNDCLASSEX wndclassex;
	wndclassex.cbClsExtra = 0;
	wndclassex.cbSize = sizeof(wndclassex);
	wndclassex.cbWndExtra = 0;
	wndclassex.hbrBackground = CreateSolidBrush(0L);
	wndclassex.hCursor = NULL;
	wndclassex.hIcon = NULL;
	wndclassex.hIconSm = NULL;
	wndclassex.hInstance = hInstance;
	wndclassex.lpfnWndProc = myWndproc;
	wndclassex.lpszClassName = AppName;
	wndclassex.lpszMenuName = NULL;
	wndclassex.style = CS_VREDRAW | CS_HREDRAW;

	if(!RegisterClassEx(&wndclassex))
	{
		MessageBox(NULL,TEXT("RegisterClassEx Fails"),TEXT("Warning"),0);
	}

	HWND hWnd = CreateWindow(AppName,TEXT("Mywindow"),WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
				CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
   
	ShowWindow(hWnd,nCmdShow);
	UpdateWindow(hWnd);
	hDlgModeless = CreateDialog(hInstance,MAKEINTRESOURCE(COLORSCRDLG),hWnd,(DLGPROC)ColorScrDlg);
	
	MSG uMsg;
	while(GetMessage(&uMsg,NULL,0,0))
	{
		if(hDlgModeless == 0 || !IsDialogMessage(hDlgModeless,&uMsg))
		{
			TranslateMessage(&uMsg);
			DispatchMessage(&uMsg);
		}
	}

	return 0;
}

LRESULT CALLBACK myWndproc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
	int wId,wEvent;//WM_COMMAND的控件ID和通知码
	static HINSTANCE hInstance;
	switch(uMsg)
	{
	case WM_CREATE:	
	//	hInstance = ((LPCREATESTRUCT)lParam)->hInstance;
	//	hDlgModeless = CreateDialog(hInstance,TEXT("ColorScrDlg"),hwnd,(DLGPROC)ColorScrDlg);
		return 0;
	case WM_DESTROY:
		DeleteObject((HGDIOBJ)SetClassLong(hwnd,GCL_HBRBACKGROUND,(LONG)GetStockObject(WHITE_BRUSH)));
		PostQuitMessage(0);
		return 0;
	case WM_CLOSE:
		DestroyWindow(hwnd);
		return 0;		
	case WM_PAINT:		
		return 0;
	case WM_SIZE:		
		return 0;							
	case WM_VSCROLL:	
		return 0;
	case WM_COMMAND:
		wId = LOWORD(wParam);
		wEvent = HIWORD(wParam);
		return 0;
	}
	return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
bool CALLBACK ColorScrDlg(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	static int iColor[3];
	int* p = iColor;
	HWND hwndParent,hCtrl;
	int iCtrlID,iIndex;
	switch(uMsg)
	{
	case WM_INITDIALOG:
		for(iCtrlID = 10;iCtrlID < 13;iCtrlID++)
		{
			hCtrl = GetDlgItem(hwnd,iCtrlID);
			SetScrollRange(hCtrl,SB_CTL,0,255,false);
			SetScrollPos(hCtrl,SB_CTL,0,false);
		}
		return true;
	case WM_SYSCOMMAND: 
		switch(wParam)
		{
		case SC_CLOSE://关闭对话框
			DestroyWindow(hwnd);
			break;
		}
		return true;
	case WM_VSCROLL:
		hCtrl = (HWND)lParam;
		iCtrlID = GetWindowLong(hCtrl,GWL_ID);
		iIndex = iCtrlID - 10;
		hwndParent = GetParent(hwnd);
		switch(LOWORD(wParam))
		{
		case SB_PAGEDOWN:
			iColor[iIndex] = min(iColor[iIndex] + 15,255);
			break;
		case SB_PAGEUP:
			iColor[iIndex] = max(iColor[iIndex] - 15,0);
			break;
		case SB_LINEUP:
			iColor[iIndex] = max(iColor[iIndex] - 1,0);
			break;
		case SB_LINEDOWN:
			iColor[iIndex] = min(iColor[iIndex] + 1,255);
			break;
		case SB_TOP:
			iColor[iIndex] = 0;
			break;
		case SB_BOTTOM:
			iColor[iIndex] = 255;
			break;
		case SB_THUMBPOSITION:
		case SB_THUMBTRACK:
			iColor[iIndex] = HIWORD(wParam);
			break;	
		default:
			return false;
		}
		SetScrollPos(hCtrl,SB_CTL,iColor[iIndex],true);
		SetDlgItemInt(hwnd,iCtrlID + 3,iColor[iIndex],false);
		DeleteObject((HGDIOBJ)SetClassLong(hwndParent,GCL_HBRBACKGROUND,(LONG)CreateSolidBrush(
																RGB(iColor[0],
																iColor[1],
																iColor[2]))));
		InvalidateRect(hwndParent,NULL,true);
		//UpdateWindow(hwndParent);

		return true;

	}
	return false;
}

rc:

//Microsoft Developer Studio generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// Chinese (中国) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)
#ifdef _WIN32
LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
#pragma code_page(936)
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE DISCARDABLE 
BEGIN
    "resource.h\0"
END

2 TEXTINCLUDE DISCARDABLE 
BEGIN
    "#include ""afxres.h""\r\n"
    "\0"
END

3 TEXTINCLUDE DISCARDABLE 
BEGIN
    "\r\n"
    "\0"
END

#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

COLORSCRDLG DIALOG DISCARDABLE  32, 32, 162, 162
STYLE WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
FONT 10, "System"
BEGIN
    LTEXT           "&Red",IDC_STATIC,29,16,14,8
    LTEXT           "&Green",IDC_STATIC,72,16,21,8
    LTEXT           "&Blue",IDC_STATIC,115,16,14,8
    SCROLLBAR       IDC_SCROLLBAR1,27,30,18,97,SBS_VERT
    SCROLLBAR       IDC_SCROLLBAR2,70,30,18,97,SBS_VERT
    SCROLLBAR       IDC_SCROLLBAR3,113,30,18,97,SBS_VERT
    LTEXT           "0",IDC_STATIC1,29,133,14,8
    LTEXT           "0",IDC_STATIC2,72,133,14,8
    LTEXT           "0",IDC_STATIC3,115,133,14,8
END


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO DISCARDABLE 
BEGIN
    COLORSCRDLG, DIALOG
    BEGIN
        LEFTMARGIN, 7
        RIGHTMARGIN, 155
        TOPMARGIN, 7
        BOTTOMMARGIN, 155
    END
END
#endif    // APSTUDIO_INVOKED

#endif    // Chinese (中国) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

#define IDC_SCROLLBAR1                  10
#define IDC_SCROLLBAR2                  11
#define IDC_SCROLLBAR3                  12
#define IDC_STATIC1                     13
#define IDC_STATIC2                     14
#define IDC_STATIC3                     15
#define COLORSCRDLG                     102

// Next default values for new objects
// 
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        103
#define _APS_NEXT_COMMAND_VALUE         40001
#define _APS_NEXT_CONTROL_VALUE         1006
#define _APS_NEXT_SYMED_VALUE           101
#endif
#endif

[beautyangus]

我花了 10s，找到两个重要的问题。 1.WM_PAINT 不应该直接就 return 掉，必须在处理 WM_PAINT 的时候进行 BeginPaint。 2.WM_SYSCOMMAND 是处理标题栏拖动等操作的，楼主直接 return true; 没有传递给 DefWndProc，标题栏当然无法拖动了。 ^_^

[IT保安]

谢谢回复啦，我把 WM_SYSCOMMAND都给注释掉，对话框过程的结尾 return DefWindowProc(hwnd,uMsg,wParam,lParam);好像就解决了问题了！ 现在对话框可以拖动了，但是一旦拖动，就会将其他的程序最小化，这是为什么？

[beautyangus]

在 Windows 7 以及后面的操作系统里，拖动标题栏晃动窗口，会最小化其他窗口，这不是你代码的问题。