windows编程--第一个WinMain程序

#include <Windows.h>
#include <stdio.h>
#include <tchar.h>
#include <iostream>

LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);

int WINAPI WinMain(
HINSTANCE hInstance, // handle to current instance
HINSTANCE hPrevInstance, // handle to previous instance
LPSTR lpCmdLine, // command line
int nCmdShow // show state
)
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WindowProc;
wndcls.lpszClassName=_T("MyWndClass");
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW | CS_VREDRAW;

RegisterClass(&wndcls);

HWND hwnd;
hwnd=CreateWindow(_T("MyWndClass"),_T("MyWnd"),WS_OVERLAPPEDWINDOW,0,0,400,600,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);

MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}

LRESULT CALLBACK WindowProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
)
{
HDC hdc;
switch(uMsg)
{
case WM_CHAR:
char szChar[20];
sprintf(szChar,"char is %d",wParam);
MessageBoxA(hwnd,szChar,"MyMessageBox",0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,_T("mouse clicked"),_T("MyMessageBox"),0);
hdc=GetDC(hwnd);
TextOut(hdc,0,50,_T("mouse clicked"),strlen(("mouse clicked")));
ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
PAINTSTRUCT ps;
hdc=BeginPaint(hwnd,&ps);
TextOut(hdc,0,0,_T("mouse clicked"),strlen(("mouse clicked")));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,_T("exit or not?"),_T("MyMessageBox"),MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}

P.S.
1.GetMessage(&msg,NULL,0,0)
NULL GetMessage retrieves messages for any window that belongs to the calling thread and
thread messages posted to the calling thread using the PostThreadMessage function.
2.MessageBoxA and MessageBox