我对 WM_PAINT 有疑问。基本上我希望在用户 WM_COMMAND 之后调用 WM_PAINT,但由于某种原因,它无论如何都会在主函数中调用。
case WM_PAINT:
{
createFont();
PAINTSTRUCT ps;
HBRUSH hbruzh = CreateSolidBrush(RGB(0,0,0));
HDC hdz = BeginPaint(hWnd,&ps);
string s = "Memory Address";
SelectBrush(hdz,hbruzh);
SelectFont(hdz,hf);
TextOut(hdz,0,0,s.c_str(),s.length());
EndPaint(hWnd,&ps);
DeleteObject(hbruzh);
DeleteObject(hdz);
break;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
HWND hWnd;
WNDCLASSEX wc;
ZeroMemory(&wc, sizeof(WNDCLASSEX));
hThisInstance = hInstance;
LoadLibrary("Riched20.dll");
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszMenuName = MAKEINTRESOURCE(IDR_MYMENU);
if(!(wc.hIcon = LoadIcon(hInstance,MAKEINTRESOURCE(IDI_MYICON)))) {
HRESULT res = GetLastError();
}
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
wc.lpszClassName = TEXT("Testcpp");
RegisterClassEx(&wc);
hWnd = CreateWindowEx(NULL,
wc.lpszClassName,
TEXT("uTest"),
WS_OVERLAPPEDWINDOW,
300,
200,
450,
300,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hWnd,nCmdShow);
MSG msg;
while (GetMessage(&msg, NULL,0,0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
根据 MSDN,WM_PAINT 仅在 UpdateWindow() 或 ReDrawWindow() 之后,或者当您将其作为消息 SendMessage 时才会自动调用。然而,我什么都不做。我基本上只想在用户交互之后调用 WM_PAINT,而不是之前......有什么办法可以解决这个问题吗?这是什么原因造成的?(我想这是一些奇怪的副作用,我找不到 >.< 的文档)