InvalidateRect 更新无效问题

qq_26540489 2016-07-22 10:02:19
是这样，我在做一个钟表的程序，把钟表的指针用子窗口来刷新，父窗口刷新表盘和中上部文字，其中：drawClock（）函数是画表盘； drawHand（）函数是画表针；drawLine（）是画一条横向的线，画在父子窗口的交界处
PS:这是win32的程序。。。不是MFC


*******************************************************************************************************************/



#include <windows.h>

#include <math.h>



#define ID_TIMER 1 

static TCHAR szChild[] = TEXT("test1Child");



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

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

void drawClock(HDC hdc, RECT rect);

void drawHand(HDC hdc, RECT rect);

void drawLine(HDC hdc, int x, int y);



double hour, minute, second;

double tem_h, tem_m, tem_s;

int add_h, add_m, add_s;



HPEN hNewPen_h, hNewPen_m, hNewPen_s, hOldPen;

HPEN hRoll, hBlod;

int mid_y, line_y, mouse_y;

bool isPitch = false;



HWND hwndChild;



int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

{

	static TCHAR szAppName[] = TEXT("test1");

	HWND hwnd;

	MSG msg;

	WNDCLASS wndclass;



	wndclass.style = CS_HREDRAW | CS_VREDRAW;

	wndclass.lpfnWndProc = WndProc;

	wndclass.cbClsExtra = 0;

	wndclass.cbWndExtra = 0;

	wndclass.hInstance = hInstance;

	wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

	wndclass.lpszMenuName = NULL;

	wndclass.lpszClassName = szAppName;

	if (!RegisterClass(&wndclass))

	{

		int i = GetLastError();

		MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);



		return 0;

	}

	wndclass.lpszClassName = szChild;

	wndclass.lpfnWndProc = ChildWndProc;

	wndclass.cbWndExtra = sizeof(long);

	wndclass.hIcon = NULL;

	wndclass.hbrBackground = (HBRUSH)GetStockObject(HOLLOW_BRUSH);

	RegisterClass(&wndclass);

	hwnd = CreateWindow(szAppName,

		TEXT("The Hello Program"),

		WS_OVERLAPPEDWINDOW,

		CW_USEDEFAULT,

		CW_USEDEFAULT,

		CW_USEDEFAULT,

		CW_USEDEFAULT,

		NULL,

		NULL,

		hInstance,

		NULL);

	ShowWindow(hwnd, iCmdShow);

	UpdateWindow(hwnd);

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

	{

		TranslateMessage(&msg);

		DispatchMessage(&msg);

	}

	return msg.wParam;

}



LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lPARAM)

{

	SYSTEMTIME Time = { 0 };

	HDC hdc;

	PAINTSTRUCT ps;

	static RECT rect;

	switch (message)

	{

	case WM_CREATE:

		//		PlaySound(TEXT("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC);

		GetLocalTime(&Time);//获得当前本地时间

		tem_s = Time.wSecond;

		tem_m = Time.wMinute;

		tem_h = Time.wHour;

		second = Time.wSecond * 2 * 3.14 / 60;

		minute = Time.wMinute * 2 * 3.14 / 60 + second / 60;

		hour = Time.wHour * 2 * 3.14 / 12 + minute / 60;

		add_h = 0;

		add_m = 0;

		add_s = 0;

		hdc = GetDC(hwnd);

		GetClientRect(hwnd, &rect);

		mid_y = rect.bottom / 2;

		line_y = mid_y;



		hwndChild = CreateWindow(szChild, NULL,	WS_CHILDWINDOW | WS_VISIBLE,rect.left, line_y, rect.right-rect.left, rect.bottom-line_y,hwnd, (HMENU)(001),	(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);

		ReleaseDC(hwnd, hdc);

		return 0;

	case WM_MOUSEMOVE:

		if (isPitch)

		{

			if (wParam & MK_LBUTTON)

			{

				line_y = HIWORD(lPARAM);

				MoveWindow(hwndChild, 0, line_y, rect.right, rect.bottom-line_y, TRUE);

				InvalidateRect(hwnd, NULL, TRUE);

			}

		}

		return 0;

	case WM_LBUTTONUP:

		InvalidateRect(hwnd, NULL, TRUE);

		isPitch = false;

		return 0;

	case WM_LBUTTONDOWN:

		mouse_y = HIWORD(lPARAM);

		if ((mouse_y >= line_y - 10) && (mouse_y <= line_y + 40))

		{

			isPitch = true;

		}

		InvalidateRect(hwnd, NULL, TRUE);

		return 0;

	case WM_PAINT:

		hdc = BeginPaint(hwnd, &ps);

		GetClientRect(hwnd, &rect);

		rect.bottom = line_y;

		DrawText(hdc, TEXT("Hello Word!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);

		GetClientRect(hwnd, &rect);

		drawLine(hdc, rect.right, line_y);

		drawClock(hdc, rect);

		EndPaint(hwnd, &ps);

		return 0;



	case WM_DESTROY:

		KillTimer(hwnd, ID_TIMER);



		DeleteObject(hNewPen_h);

		DeleteObject(hNewPen_m);

		DeleteObject(hNewPen_s);

		DeleteObject(hOldPen);

		DeleteObject(hRoll);

		DeleteObject(hBlod);

		PostQuitMessage(0);

		return 0;

	default:

		break;

	}

	return DefWindowProc(hwnd, message, wParam, lPARAM);

}



LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){

	HDC hdc;

	PAINTSTRUCT ps;

	static RECT rect;



	switch (message)

	{

	case WM_CREATE:

		SetTimer(hwnd, ID_TIMER, 1000, NULL);

		return 0;



	case WM_PAINT:

		hdc = BeginPaint(hwnd, &ps);

		GetClientRect(hwnd, &rect);

		drawHand(hdc, rect);

		EndPaint(hwnd, &ps);

		return 0;

	case WM_TIMER:

		add_s++;

		if (add_s == 60)

		{

			add_m++;

			add_s = 0;

		}

		if (add_m == 60)

		{

			add_h++;

			add_m = 0;

		}if (add_h == 12)

			add_h = 0;

		second = (tem_s + add_s) * 2 * 3.14 / 60;

		minute = (tem_m + add_m) * 2 * 3.14 / 60 + second / 60;

		hour = (tem_h + add_h) * 2 * 3.14 / 12 + minute / 60;

		InvalidateRect(hwnd, NULL, TRUE);

		return 0;

	default:

		break;

	}

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

}



void drawClock(HDC hdc, RECT rect)

{

	hBlod = CreatePen(PS_SOLID, 3, RGB(30, 30, 30));

	double tem_s;

	int point_x, point_y, r;

	int h_x, h_y;

	if (rect.right>(rect.bottom - line_y))

	{

		r = (rect.bottom - line_y)*0.4;

	}

	else

	{

		r = rect.right * 0.4;

	}

	point_x = rect.right / 2;

	point_y = (rect.bottom - line_y) / 2 + line_y;



	hOldPen = (HPEN)SelectObject(hdc, hBlod);

	Ellipse(hdc, point_x - r, point_y - r, point_x + r, point_y + r);

	for (int i = 0; i<12; i++)

	{

		if (i == 0 || i == 3 || i == 6 || i == 9)

		{



			tem_s = i*3.14 * 2 / 12;

			h_x = sin(tem_s)*r;

			h_y = cos(tem_s)*r;

			MoveToEx(hdc, h_x + point_x, h_y + point_y, NULL);

			h_x = sin(tem_s)*(r*0.75);

			h_y = cos(tem_s)*(r*0.75);

			LineTo(hdc, h_x + point_x, h_y + point_y);

			continue;

		}

		tem_s = i*3.14 * 2 / 12;

		h_x = sin(tem_s)*r;

		h_y = cos(tem_s)*r;

		MoveToEx(hdc, h_x + point_x, h_y + point_y, NULL);

		h_x = sin(tem_s)*(r*0.9);

		h_y = cos(tem_s)*(r*0.9);

		LineTo(hdc, h_x + point_x, h_y + point_y);

	}

}



void drawHand(HDC hdc, RECT rect)

{

	hNewPen_h = CreatePen(PS_SOLID, 8, RGB(50, 70, 83));

	hNewPen_m = CreatePen(PS_SOLID, 4, RGB(192, 192, 192));

	hNewPen_s = CreatePen(PS_SOLID, 1, RGB(118, 128, 105));

	int hx, hy, mx, my, sx, sy;

	int point_x, point_y, r;

	if (rect.right>(rect.bottom - rect.top))

	{

		r = (rect.bottom - rect.top)*0.4;

	}

	else

	{

		r = rect.right * 0.4;

	}

	point_x = rect.right / 2;

	point_y = (rect.bottom - rect.top) / 2 ;

	MoveToEx(hdc, point_x, point_y, NULL);

	hx = sin(hour)*(r / 5);

	hy = -cos(hour)*(r / 5);

	mx = sin(minute)*(r / 2);

	my = -cos(minute)*(r / 2);

	sx = sin(second)*r;

	sy = -cos(second)*r;



	hOldPen = (HPEN)SelectObject(hdc, hNewPen_h);

	LineTo(hdc, hx + point_x, hy + point_y);



	SelectObject(hdc, hNewPen_m);

	MoveToEx(hdc, point_x, point_y, NULL);

	LineTo(hdc, mx + point_x, my + point_y);



	SelectObject(hdc, hNewPen_s);

	MoveToEx(hdc, point_x, point_y, NULL);

	LineTo(hdc, sx + point_x, sy + point_y);



	SelectObject(hdc, hOldPen);

}



void drawLine(HDC hdc, int x, int y)

{

	HPEN hNewPen, hOldPen;

	hNewPen = CreatePen(PS_SOLID, 3, RGB(255, 0, 0));

	hOldPen = (HPEN)SelectObject(hdc, hNewPen);

	MoveToEx(hdc, 0, y, NULL);

	LineTo(hdc, x, y);

	SelectObject(hdc, hOldPen);

	DeleteObject(hNewPen);

}

现在问题如下：子视窗新的表针不断地再画但是之前旧的表针还存在着，而计时器WM_TIMMER中也写了可是不起作用
怀疑可能导致的因素：
（1） UpdateWindow(hwnd);只在主函数写了，更新的是父窗口的句柄，是不是写个子窗口的更新，可是写在哪里？父窗口的WM_CREATE?
( 2 ) InvalidateRect(hwnd, NULL, TRUE);中的hwnd是子窗口的形参，真的实参我不大清楚在哪里赋值的，会不会是这个句柄是父窗口的句柄导致一直更新的是父窗口，但是修改哪里呢？
（3） 虽然可能性不大，但是不会是需要多线程来轮流调度父子窗口吧
...全文
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schlafenhamster 2016-07-23
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// 不使用 SetROP2(hdc,R2_NOT); 的
void drawHand(HDC hdc, RECT rect,BOOL erase)
{
	if(erase)
	{// 背景色 白色
		hNewPen_h = CreatePen(PS_SOLID, 1, RGB(255, 255, 255));
		hNewPen_m = CreatePen(PS_SOLID, 1, RGB(255, 255, 255));
		hNewPen_s = CreatePen(PS_SOLID, 1, RGB(255, 255, 255));
	}
	else
	{
		hNewPen_h = CreatePen(PS_SOLID, 8, RGB(50, 70, 83));
		hNewPen_m = CreatePen(PS_SOLID, 4, RGB(192, 192, 192));
		hNewPen_s = CreatePen(PS_SOLID, 1, RGB(118, 128, 105));
	}
	int hx, hy, mx, my, sx, sy;
	int point_x, point_y, r;
	if (rect.right>(rect.bottom - rect.top))
	{
		r = (int)((rect.bottom - rect.top)*0.4);
	}
	else
	{
		r = (int)(rect.right * 0.4);
	}
	point_x = rect.right / 2;
	point_y = (rect.bottom - rect.top) / 2 ;
	hx = (int)(sin(hour)*(r / 5));
	hy = (int)(-cos(hour)*(r / 5));

	mx = (int)(sin(minute)*(r / 2));
	my = (int)(-cos(minute)*(r / 2));

	sx = (int)(sin(second)*r);
	sy = (int)(-cos(second)*r);

	hOldPen = (HPEN)SelectObject(hdc, hNewPen_h);
	MoveToEx(hdc, point_x, point_y, NULL);
	LineTo(hdc, hx + point_x, hy + point_y);

	SelectObject(hdc, hNewPen_m);
	MoveToEx(hdc, point_x, point_y, NULL);
	LineTo(hdc, mx + point_x, my + point_y);

	SelectObject(hdc, hNewPen_s);
	MoveToEx(hdc, point_x, point_y, NULL);
	LineTo(hdc, sx + point_x, sy + point_y);

	SelectObject(hdc, hOldPen);
}
schlafenhamster 2016-07-22
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1. void drawHand(HDC hdc, RECT rect) { SetROP2(hdc,R2_NOT); 2. 画2次 case WM_TIMER: // 擦除 原来的 hdc=GetDC(hwnd); GetClientRect(hwnd, &rect); drawHand(hdc, rect); // 改变时间 add_s++; if (add_s == 60) { add_m++; add_s = 0; } if (add_m == 60) { add_h++; add_m = 0; }if (add_h == 12) add_h = 0; second = (tem_s + add_s) * 2 * 3.14 / 60; minute = (tem_m + add_m) * 2 * 3.14 / 60 + second / 60; hour = (tem_h + add_h) * 2 * 3.14 / 12 + minute / 60; // 画新的 hdc=GetDC(hwnd); GetClientRect(hwnd, &rect); drawHand(hdc, rect); // InvalidateRect(hwnd, NULL, TRUE); return 0;
qq_26540489 2016-07-22
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引用 2 楼 VisualEleven 的回复:
InvalidateRect(hwnd, NULL, TRUE); ---》 InvalidateRect(GetParent(hwnd), NULL, TRUE);
您好，这样是可以的，但是不就是没有了子视窗的意义了嘛。我做子视窗是想只刷新子视窗的东西，不用连带父视窗一起重绘
qq_26540489 2016-07-22
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引用 1 楼 lx624909677 的回复:
InvalidateRect的调用里，rect呢？
为空的话不是就刷新整个客户区么。。？
lx624909677 2016-07-22
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BOOL InvalidateRect( HWND hWnd, // handle of window with changed update region CONST RECT *lpRect, // address of rectangle coordinates BOOL bErase // erase-background flag ); 第二个参数表示要重绘的区域坐标，如果调用不好用，试试Invalidate(TRUE);如果这个可以，那就是坐标计算错了
Eleven 2016-07-22
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InvalidateRect(hwnd, NULL, TRUE); ---》 InvalidateRect(GetParent(hwnd), NULL, TRUE);
lx624909677 2016-07-22
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InvalidateRect的调用里，rect呢？
InvalidateRect,Invalidate,UpdateWindow区别
在编程的时候经常把UpdateData、Invalidate、InvalidateRect和UpdateWindow四个函数混淆，在这里将简单介绍它们的区别
vc++使控件无效的例子.rar
vc++使控件无效的例子.rar visual c++使控件无效的例子.rar
Invalidate()函数[参考].pdf
Invalidate()函数[参考].pdf
ClipPaint.rar
说明如何使用InvalidateRect(&rc); CPaintDC; m_ps.rcPaint。 同时包括CWnd的ScrollWindow(delta,0);
裁剪区绘制.zip
1. Use InvalidateRect(&rc;); 2. Use "window's scrollbar which is not a controler" 3. Use WM_KICKIDLE
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