非主线程创建窗口也能工作正常,只要我们注意一点:消息循环必须要和创建窗口在同一线程!

#include "stdafx.h"
#include "win32.h"
#include "windows.h"
#include

#define MAX_LOADSTRING 100

HWND g_hWnd = NULL;
HINSTANCE g_hInst;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

void CreateWnd(void)
{

WNDCLASS wc = {0};
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = g_hInst;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetSysColorBrush(COLOR_WINDOW);
wc.lpszMenuName = NULL;
wc.lpszClassName = TEXT("SimpleWindow");

RegisterClass(&wc);

g_hWnd = CreateWindowEx(0,
TEXT("SimpleWindow"),
TEXT("SimpleWindow"),
WS_VISIBLE,
0,
0,
200,
200,
NULL,
NULL,
g_hInst,
0);
}

DWORD ThreadBaseFunc(LPVOID lpParam)
{
CreateWnd();
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return 0;
}

int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
g_hInst = hInstance;
HANDLE hThrd =(HANDLE)_beginthreadex( NULL,0,(unsigned int (__stdcall*)(void*))ThreadBaseFunc,NULL,0,NULL);
CloseHandle(hThrd);
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return 0;
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT wMsg,WPARAM wParam,LPARAM lParam)
{
return DefWindowProc(hWnd,wMsg,wParam,lParam);
}