怎样在多线程中创建控件？

Question

问题：在 vc 中创建 Win32 Application，通过 SDK 创建窗口并添加控件，这些代码是比较容易的。在这个代码的基础上，将创建控件的代码放到另一个线程中却不能实现。以下代码创建了一个文本框和一个按钮，按钮就是在原线程中创建的，没有问题；文本框是在另一个线程中创建的，不能显示。请问该怎样做？
#include <windows.h>HINSTANCE g_hInstance;
HWND hEdit, hButton;
HWND g_hwnd;
DWORD WINAPI ThreadFunc(LPVOID para)
{
hEdit = CreateWindow("Edit","Edit",WS_BORDER | WS_VISIBLE | WS_CHILD,
10,10,50,20,g_hwnd,NULL,g_hInstance,NULL);
return 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
g_hwnd = hwnd; switch (uMsg)
{
case WM_CREATE:
hButton = CreateWindow("Button","Button",WS_VISIBLE | WS_CHILD,
15,30,55,20,g_hwnd,NULL,g_hInstance,NULL);
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunc, 0, 0, 0);
break; case WM_DESTROY:
PostQuitMessage(0);
break; default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
g_hInstance = hInstance; WNDCLASS ws;
ws.cbClsExtra=0;
ws.cbWndExtra=0;
ws.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
ws.hCursor=LoadCursor(NULL,IDC_ARROW);
ws.hIcon=LoadIcon(NULL,IDI_APPLICATION);
ws.hInstance=hInstance;
ws.lpszClassName="学习";
ws.lpszMenuName=NULL;
ws.style=CS_HREDRAW|CS_VREDRAW;
ws.lpfnWndProc=WindowProc;
RegisterClass(&ws);

HWND hwnd=CreateWindow("学习","hello word!",WS_OVERLAPPEDWINDOW&~WS_MAXIMIZEBOX,150,10,200,100,0,0,hInstance,0);
ShowWindow(hwnd,SW_NORMAL);
UpdateWindow(hwnd); MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
} return 0;
}

Answer 1

user32 中的对象只属于创建她的那个线程.你不要这么做.

Answer 2

把你的线程函数改成这样看看DWORD WINAPI ThreadFunc(LPVOID para)
{
    hEdit = CreateWindow("Edit","Edit",WS_BORDER | WS_VISIBLE | WS_CHILD,
        10,10,50,20,g_hwnd,(HMENU)0x11,g_hInstance,NULL);
MSG msg;
    while (GetMessage(&msg,NULL,0,0);)
    {

        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}