在另一个线程（不是主线程）中创建窗口

我有一个功能：

HWND createMainWindow(P2p_Socket_Machine * toSend){

    HWND hMainWnd = CreateWindow( 
        L"Class",/*(LPCWSTR) nameOfConference.c_str()*/L"Chat",  WS_OVERLAPPED | WS_MINIMIZEBOX | WS_SYSMENU, 
    CW_USEDEFAULT, 0, 600,400, 
    (HWND)NULL, (HMENU)NULL, 
    /*(HINSTANCE)hlnstance*/NULL, NULL 
    ); 

    if (!hMainWnd) { 
        MessageBox(NULL, L"Cannot create main window", L"Error", MB_OK); 
        return 0; 
    }

    CreateWindowA("LISTBOX",NULL, WS_CHILD|WS_VISIBLE|WS_BORDER|WS_VSCROLL|LBS_NOTIFY|LBS_MULTIPLESEL,310,30,255,275,hMainWnd,(HMENU)List_Box,NULL,NULL);

    CreateWindowExA(NULL,"BUTTON", "Refresh", WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,385,310,100,24,hMainWnd,(HMENU)Button_Refresh, NULL ,NULL);

    CreateWindowExA(NULL,"BUTTON", "Send", WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,385,334,100,24,hMainWnd,(HMENU)Button_Send, NULL ,NULL);

    CreateWindowExA(NULL,"BUTTON", "New", WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,385,354,100,24,hMainWnd,(HMENU)Button_New, NULL ,NULL);

    CreateWindowA("EDIT",0,WS_BORDER|WS_VISIBLE|WS_CHILD|ES_LEFT|ES_MULTILINE|WS_VSCROLL|WS_DISABLED,
    10,30,265,275,hMainWnd,(HMENU)Text_Box_Get,NULL,NULL);

    CreateWindowA("EDIT",0,WS_BORDER|WS_VISIBLE|WS_CHILD|ES_LEFT|ES_MULTILINE|WS_VSCROLL,
    10,320,265,45,hMainWnd,(HMENU)Text_Box_Send,NULL,NULL);

    SetWindowLongPtr(hMainWnd,GWLP_USERDATA,(LONG_PTR)toSend);

    ShowWindow(hMainWnd, SW_SHOW); 
    //UpdateWindow(hMainWnd);

    return hMainWnd;

}

这是我的程序的主要部分：

int WINAPI WinMain(HINSTANCE hlnstance, HINSTANCE hPrevInstance, LPSTR IpCmdLine, int 
nCmdShow) 
{
WNDCLASSEX wc; 
    wc.cbSize = sizeof(wc); 
    wc.style = CS_HREDRAW | CS_VREDRAW; 
    wc.lpfnWndProc = MyFunc; 
    wc.cbClsExtra = 0; 
    wc.cbWndExtra = 0; 
    wc.hInstance = hlnstance; 
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
    wc.hCursor = LoadCursor(NULL, IDC_ARROW); 
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName = NULL; 
    wc.lpszClassName = L"Class"; 
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
HWND toSend = createMainWindow(P2pSocket);

//some code

hThread = CreateThread(NULL, 0, ClientThread, 
            Message2, 0, &dwThreadId);

        if (hThread == NULL)
        {
            cout<<"Create thread filed";
            exit(10);
        }


    while (GetMessage(&msg, NULL, 0, 0)) { 

        TranslateMessage(&msg); 
        DispatchMessage(&msg);

    }

    return msg.wParam;   

当我在程序的主要部分调用函数 createMainWindow() 时 它按预期工作，但是当我运行它时 我的线程（ClientThread）不起作用。我读过我应该只在主线程中创建窗口。这是真的吗？如果这是真的，那么从另一个线程调用这个函数并在主线程中完成的最简单的方法是什么？

感谢大家。现在我知道了问题所在，但我坚持解决方案。 我的客户端线程代码是：

while(1){

    vector<HWND> AllHandlers;

    pair<string,string> Answer = Pointer->receiveMsgByUdp();

    if(!Pointer->isMyLocalAddress(Answer.first)){

        int type = messageUdpContentType(Answer.second);

        switch(type){

        case 0 :

            Pointer->sendMsgToIpUdp(Answer.first,"<?xml version='1.0'?><accepted/>");
            AllHandlers = getAllHandlersOfElementsOnWindowsByIdentityCode(Pointer->getAllHandlers(),List_Box);
            for(vector<HWND>::iterator j = AllHandlers.begin();j!=AllHandlers.end();j++)
                if(SendMessageA(*j, LB_FINDSTRINGEXACT, 0, (LPARAM)Answer.first.c_str())==LB_ERR)
                    SendMessageA(*j, LB_ADDSTRING, 0, (LPARAM)Answer.first.c_str());

            break;

        case 1 :
            AllHandlers = getAllHandlersOfElementsOnWindowsByIdentityCode(Pointer->getAllHandlers(),List_Box);
            for(vector<HWND>::iterator j = AllHandlers.begin();j!=AllHandlers.end();j++)
                if(SendMessageA(*j, LB_FINDSTRINGEXACT, 0, (LPARAM)Answer.first.c_str())==LB_ERR)
                    SendMessageA(*j, LB_ADDSTRING, 0, (LPARAM)Answer.first.c_str());

            break;

        case 2 :
            AllHandlers = getAllHandlersOfElementsOnWindowsByIdentityCode(Pointer->getAllHandlers(),List_Box);
            for(vector<HWND>::iterator j = AllHandlers.begin();j!=AllHandlers.end();j++)
                if((i = SendMessageA(*j, LB_FINDSTRINGEXACT, 0, (LPARAM)Answer.first.c_str()))!=LB_ERR)
                    SendMessageA(*j,LB_DELETESTRING, 0, (LPARAM)Answer.first.c_str());

            break;

        case 3 :

            userReply = MessageBoxW(NULL, L"Принять приглашение на конференцию?",
                    L"", MB_YESNO | MB_ICONQUESTION); 
            if (userReply==IDYES){

                //todo: Проверка на создание встречи, в которой уже состоишь
                string nameOfConf = fetchNameOfInviteConf(Answer.second);
                Pointer->createConference(nameOfConf);
                HWND toSendTo = createMainWindow(Pointer);
                Pointer->setHandlerInfo(nameOfConf,toSendTo);               
                Pointer->addNewMemberToConference_ServerType(nameOfConf,Answer.first);
                string toSend = string("<?xml version='1.0'?><inviteAccepted>") + nameOfConf + string("</inviteAccepted>");
                Pointer->sendMsgToIpUdp(Answer.first,toSend);

            }
            break;

        case 4 :

            string nameOfConf = fetchNameOfInviteAcceptConf(Answer.second);

            toSend.clear();
            Participants.clear();
            Participants = Pointer->getCurrentParticipants(nameOfConf);
            toSend+="<?xml version='1.0'?>";
            toSend+="<conference>";
            toSend+="<nameOfConference>";
            toSend+=nameOfConf;
            toSend+="</nameOfConference>";
            for(vector<string>::iterator i = Participants.begin();i!=Participants.end();i++){
                toSend+="<participant>" + *i + "</participant>";
            }
            toSend+="</conference>";



            Pointer->addNewMemberToConference_ClientType(nameOfConf,Answer.first);

            Pointer->sendToIpTcp(Answer.first,toSend);

            break;

    }

函数 receiveMsgByUdp() 停止该线程直到收到消息。对于缺乏知识，我深表歉意，但是我可以使用哪些功能或其他东西来解决这个问题。我应该重写我的方法 receiveMsgByUdp() 为异步方法还是如何调用函数 createMainWindow() 在主线程上运行？关于最后一个变体：我如何在纯 winapi 中执行此操作，我找不到任何简单的示例。有人可以给出代码片段吗。再次感谢）

您确实可以在主 UI 线程以外的线程中创建窗口。但是，这些窗口将与创建它们的线程具有亲和力，并且您将需要在创建窗口的每个线程中运行消息泵。

因此，虽然您可以按照您的要求进行操作，但 Win32 确实设计用于与同一线程具有亲和力的进程中的所有窗口一起工作。创建多个 UI 线程确实没有任何好处。你所要做的就是让你的生活变得异常且不必要的复杂。