我已经创建了一个自定义的静态窗口,它显示一个位图图像,这个窗口是其他窗口的子窗口。现在我想为这个窗口捕获鼠标事件,以便我可以提供裁剪图像的功能。
但问题是鼠标事件没有传递到这个子窗口......以下是子窗口的 WndProc
代码片段:
WNDPROC origStatProc;
// Variable which stores the handle of BITMAP image
HBITMAP hBitmap=NULL;
LRESULT CALLBACK dispWndProc(HWND hwnd,UINT msg, WPARAM wParam, LPARAM lParam)
{
static HDC hdc;
static PAINTSTRUCT paintSt;
static RECT aRect;
switch(msg)
{
case WM_PAINT:
{
hdc = BeginPaint(hwnd,&paintSt);
GetClientRect(hwnd,&aRect);
if(hBitmap!=NULL)
{
HDC memDC = CreateCompatibleDC(hdc);
if(memDC!=NULL)
{
BITMAP bmp;
GetObject(hBitmap,sizeof(bmp),&bmp);
SelectObject(memDC,hBitmap);
SetStretchBltMode(hdc,HALFTONE);
StretchBlt(hdc,0,0,aRect.right,aRect.bottom,
memDC,0,0,bmp.bmWidth,bmp.bmHeight,
SRCCOPY);
DeleteObject(&bmp);
ReleaseDC(hwnd,memDC);
}
}
// the code for painting
EndPaint(hwnd,&paintSt);
}
break;
case STM_SETIMAGE:
{
InvalidateRect(hwnd,&aRect,true);
}
break;
case WM_LBUTTONDOWN:
{
int xPos = GET_X_LPARAM(lParam);
int yPos = GET_Y_LPARAM(lParam);
char xstr[10];
_itoa(xPos,xstr,10);
MessageBox(NULL,xstr,"X Value ",MB_OK);
}
break;
default:
return origStatProc(hwnd,msg,wParam,lParam);
}
return 0;
}
请问还需要哪些内容才能在这个子窗口内捕获鼠标事件...