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如果您还记得我们如何通过拦截WM_SYSKEYDOWN消息来停用所有的系统键盘功能,
那么您可能会想我们可否通过拦截鼠标消息完成类似的事情。
完全可以!只要您在窗口消息处理程序中包含以下几条叙述:
case WM_NCHITTEST:
return (LRESULT) HTNOWHERE ;
就可以有效地禁用您窗口中的所有显示区域和非显示区域鼠标消息。
这样一来,当鼠标在您的窗口(包括系统菜单图标、缩放按钮以及关闭按钮)中时,
鼠标按键将会失效。
#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Program");
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;
RegisterClass(&wndclass);
hwnd = CreateWindow(szAppName, TEXT("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)
{
switch (message)
{
case WM_NCHITTEST:
return (LRESULT)HTNOWHERE;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}