Question

window api创建一个子窗口

怎样在一个创建好的窗口里再创建一个子窗口，一运行两个都出现 还需要再注册一下吗 ，能不能给出代码

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Answer 1

没有关联的代码，可直接编译

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK ChildProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
static TCHAR szAppName[]=TEXT("test");
static TCHAR szChild[]=TEXT("child");
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(hInstance,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=szAppName;

if(!RegisterClass(&wndclass))
{
return 0;
}

wndclass.lpfnWndProc=ChildProc;
wndclass.lpszClassName=szChild;
if(!RegisterClass(&wndclass))
{
return 0;
}

hwnd = CreateWindow(szAppName,TEXT("Test Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);

ShowWindow(hwnd,nShowCmd);
UpdateWindow(hwnd);

hwnd = CreateWindow(szChild,TEXT("Child Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);

ShowWindow(hwnd,nShowCmd);
UpdateWindow(hwnd);

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

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{

switch(message)
{
case WM_CREATE:
return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}

LRESULT CALLBACK ChildProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{

switch(message)
{
case WM_CREATE:
return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}