WindowsAPI小程序

#include<windows.h>
#include<tchar.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

INT WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpszCmdParam,INT nCmdShow)
{
	HWND hMainWnd;
	MSG msg;
	WNDCLASS myWC;
	if(!hPrevInstance)
	{
		myWC.style=CS_VREDRAW|CS_HREDRAW;
		myWC.lpfnWndProc=WndProc;
		myWC.cbClsExtra=0;
		myWC.cbWndExtra=0;
		myWC.hInstance=hInstance;
		myWC.hIcon=LoadIcon(NULL,IDI_APPLICATION);
		myWC.hCursor=LoadCursor(NULL,IDC_ARROW);
		myWC.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
		myWC.lpszMenuName=NULL;
		myWC.lpszClassName=_T("MyWindowClass");
		RegisterClass(&myWC);
	}
	hMainWnd=CreateWindow(_T("MyWindowClass"),_T("MyWindowAPItitle"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
		NULL,NULL,hInstance,NULL);
	ShowWindow(hMainWnd,SW_SHOWMAXIMIZED);
	UpdateWindow(hMainWnd);
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hMainwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
	char messageleft[]="the left button have been pushed";
	char messageright[]="the right button have pushed";
	switch(message)
	{
	case WM_RBUTTONDOWN:
		{
			MessageBox(GetFocus(),_T("messageright"),_T("RButtonPushDown"),MB_OK|MB_ICONINFORMATION);
			break;
		}
	case WM_LBUTTONDOWN:
		{
			MessageBox(GetFocus(),_T("messageleft"),_T("LButtonPushDown"),MB_OK|MB_ICONINFORMATION);
			break;
		}
	case WM_DESTROY:
		{
			PostQuitMessage(0);
			return 0;
		}
	default:break;
	}
	return DefWindowProc(hMainwnd,message,wParam,lParam);
}

1.注册窗口类

2.创建窗口

3.消息循环

4.编写窗口消息处理函数