建立子窗口并处理其反馈的消息

在一个窗口上建立两个按钮，并分别处理每个按钮的消息，程序代码如下：
Code
#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK _procWinMain(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
HWND hWinMain,hButton1,hButton2;
MSG stMsg;
WNDCLASSEX stWndClass;
RtlZeroMemory(&stWndClass,sizeof(stWndClass));//WNDCLASSEX结构置零
//注册窗口类
stWndClass.hCursor=::LoadCursor(0,IDC_ARROW);
stWndClass.hInstance=hInstance;
stWndClass.cbSize=sizeof(WNDCLASSEX);
stWndClass.style=CS_HREDRAW||CS_VREDRAW;
stWndClass.lpfnWndProc=_procWinMain;
stWndClass.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
stWndClass.lpszClassName="myclass";
::RegisterClassEx(&stWndClass);
//建立并显示窗口
hWinMain=::CreateWindowEx(WS_EX_CLIENTEDGE,"myclass","firstwindow",WS_OVERLAPPEDWINDOW,100,100,600,400,NULL,NULL,hInstance,NULL);
//建立按钮
hButton1=::CreateWindowEx(NULL,"BUTTON","button1",WS_VISIBLE|WS_CHILD,300,200,60,20,hWinMain,(HMENU)1,hInstance,NULL);
hButton2=::CreateWindowEx(NULL,"BUTTON","button2",WS_VISIBLE|WS_CHILD,100,200,60,20,hWinMain,(HMENU)2,hInstance,NULL);

::ShowWindow(hWinMain,SW_SHOWNORMAL);
::UpdateWindow(hWinMain);
while(1)
{
if(::GetMessage(&stMsg,NULL,0,0)==0)//消息为WM_QUIT
break;
else
{
::TranslateMessage(&stMsg);
::DispatchMessage(&stMsg);
}
}
return 0;
}
LRESULT CALLBACK _procWinMain(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
if(uMsg==WM_CLOSE)
{
::DestroyWindow(hWnd);
}
else if(uMsg==WM_DESTROY)
{
::PostQuitMessage(NULL);
}
else if(uMsg==WM_COMMAND)
{
char temp1[256],temp2[256];
::itoa((int)wParam,temp1,10);
::strcpy(temp2,"wParam: ");
::strcat(temp2,temp1);
::strcat(temp2," lParam: ");
::itoa((int)lParam,temp1,10);
::strcat(temp2,temp1);
::MessageBox(NULL,temp2,"command",MB_OK);
}
else
{
return ::DefWindowProc(hWnd,uMsg,wParam,lParam);
}
return 0;
}

代码中需要注意的是
hButton1=::CreateWindowEx(NULL,"BUTTON","button1",WS_VISIBLE|WS_CHILD,300,200,60,20,hWinMain,(HMENU)1,hInstance,NULL);
hButton2=::CreateWindowEx(NULL,"BUTTON","button2",WS_VISIBLE|WS_CHILD,100,200,60,20,hWinMain,(HMENU)2,hInstance,NULL);
CreateWindowEx函数的倒数第三个参数在创建的窗口为子窗口时代表的是子窗口的ID，这个ID可以任意指定，只要不重复即可。程序的功能是当点击第一个按钮时显示第一个按钮的ID和lParam参数，当点击第二个按钮时显示第二个按钮的ID和lParam参数。