创建单独的MFC GUI线程，无法移动/调整大小/最大化CWnd

Question

我正在创建一个CWinThread，它将拥有自己的GUI。当我在该线程上创建CWnd时，它会显示，但我无法移动窗口。我确信消息泵正在运行，因为我可以从另一个线程执行MoveWindow，并且窗口会移动。

UIThread.h

#pragma once

class CUIThread : public CWinThread
{
public:
    DECLARE_DYNCREATE(CUIThread)
    CUIThread();

    // Attributes
public:
    HWND hwnd;
    // Operations
public:
    void KillThread();

    // Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CGDIThread)
    //}}AFX_VIRTUAL

    // Implementation
public:
    virtual ~CUIThread();

protected:
    virtual BOOL InitInstance();

    // Generated message map functions
    //{{AFX_MSG(CUIThread)
    // NOTE - the ClassWizard will add and remove member functions here.
    //}}AFX_MSG

    DECLARE_MESSAGE_MAP()
};

UIThread.cpp

#include "stdafx.h"
#include "UIThread.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CUIThread

IMPLEMENT_DYNCREATE(CUIThread, CWinThread)

BEGIN_MESSAGE_MAP(CUIThread, CWinThread)
    //{{AFX_MSG_MAP(CUIThread)
    // NOTE - the ClassWizard will add and remove mapping macros here.
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

CUIThread::CUIThread() : hwnd(NULL)
{
    m_bAutoDelete = FALSE;
}

BOOL CUIThread::InitInstance()
{
    this->m_pMainWnd = new CWnd;
    m_pMainWnd->Create(_T("STATIC"), _T("Hi"), WS_VISIBLE | WS_OVERLAPPEDWINDOW,
        CRect(0, 0, 500, 500), CWnd::GetDesktopWindow(), 1234);

    this->hwnd = m_pMainWnd->GetSafeHwnd();

    return TRUE;
}

CUIThread::~CUIThread()
{

}

void CUIThread::KillThread()
{
    // Note: this function is called in the context of 
    // other threads, not the thread itself.
    this->PostThreadMessage(WM_QUIT, 0, 0);

    // allow thread to run at higher priority during 
    // kill process
    SetThreadPriority(THREAD_PRIORITY_ABOVE_NORMAL);
    WaitForSingleObject(m_hThread, INFINITE);
}

的main.cpp

...
CUIThread* pUIThread = static_cast< CUIThread*>(AfxBeginThread(RUNTIME_CLASS(CUIThread)));
getchar();
MoveWindow(pUIThread->hwnd, 100, 100, 500, 500, true); // works
getchar();
CloseWindow(pUIThread->hwnd); // works
getchar();
pUIThread->KillThread(); // works
delete pUIThread;
getchar();
...

我可以看到窗口，我无法移动/最大化/调整窗口大小。

Answer 1

我相信你正在以错误的方式创建窗口。您正在创建一个子窗口，桌面作为父窗口。这应该有效：

LPCSTR strClass = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW | CS_NOCLOSE);
VERIFY(m_pMainWnd->CreateEx(0, strClass, _T("title"), WS_OVERLAPPEDWINDOW | WS_VISIBLE, CRect(0, 0, 500, 500), NULL, 0));