UC知道PostMessage 和DispatchMessage问题
来源：百度知道 编辑：UC知道 时间：2024/05/24 11:08:49
#include <windows.h>
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
static TCHAR szAppName[]=TEXT("Hello Win");
static TCHAR szClassName[]=TEXT("HelloWinClass");
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=szClassName;
if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("This Program requires Windows NT"),szAppName,MB_ICONERROR);
return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
static TCHAR szAppName[]=TEXT("Hello Win");
static TCHAR szClassName[]=TEXT("HelloWinClass");
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=szClassName;
if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("This Program requires Windows NT"),szAppName,MB_ICONERROR);
return 0;
}
那个……我想我要解释一下重要的事……
MessageBox调用前它会先执行完当前线程的消息队列上所有消息的，因为要防止这些消息传递给MessageBox这个窗口
所以就看到你那个结果了，你把MessageBox注释掉，全部换成OutputDebugString，然后以DEBUG模式运行一次，你就会看到结果是
WM_LBUTTONDOWN，然后才到WM_DESTROY
这种解释可以解释前一个你问的问题