当我在windows API代码中使用SetWindowRgn函数时,创建的windows样式从Modern变为Classic。
在此处重现问题的最小代码:
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
hwnd = CreateWindowEx(
WS_EX_TOPMOST | WS_EX_CLIENTEDGE,
g_szClassName,
"Capture Screen",
WS_OVERLAPPEDWINDOW,
10, 100, 800, 600,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, SW_NORMAL);
UpdateWindow(hwnd);
HRGN WindowRgn = CreateRectRgn(0,0,800,600);
SetWindowRgn(hwnd,WindowRgn,TRUE); // <===== comment, uncomment this line to observe difference
MSG Msg;
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
注解和取消注解下面的行将演示问题
SetWindowRgn(hwnd,WindowRgn,TRUE); // <===== comment, uncomment this line to observe difference
现代(注解行):
经典(取消注解行):
你知道函数中到底是什么导致了这个问题吗?有什么解决方法吗?
1条答案
按热度按时间vi4fp9gy1#
当使用
SetWindowRgn
时,* 系统假设具有非NULL区域的窗口是不使用视觉样式的专用窗口 *。请选中“未应用视觉样式时”。