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。