从 DLL 向 Vista 中另一个进程的窗口发送消息

发布于 2024-07-23 02:54:40 字数 1212 浏览 8 评论 0原文

我正在为这件事抓狂。我正在尝试向另一个进程中的窗口发送消息。调用 SendMessage 或 PostMessage 或 PostThreadMessage 后，我不断收到来自 GetLastError() 的访问被拒绝 (0x5) 的消息。我试过关闭UAC。我还通过确保完整性级别在进程之间匹配来考虑 UIPI。（我用 SysInternals（现在是 MS）的 Process Explorer 进行了检查）我还关闭了 Windows Defender，但没有成功。我可以从进程内部向窗口发送消息，但是从外部我就得到了 bupkus！这似乎是某种安全问题，但我不知道它是什么，因为两个进程具有相同的完整性级别（中 - 十进制 8192）

来自发送消息的 DLL 的代码

UINT MsgCode = ::RegisterWindowMessage(_T("MESSAGE_CODING_STRING"));
::ChangeWindowMessageFilter(MsgCode,MSGFLT_ADD);
::PostMessage(hwnd1,MsgCode,(WPARAM)1,(LPARAM)1);
DWORD errorcode = ::GetLastError();

从接收窗口选择的代码

BEGIN_MESSAGE_MAP(CMessageMailBox, CDialog)
    ON_REGISTERED_MESSAGE(MsgCode, TextFromApp)
END_MESSAGE_MAP()

// Class Constructor    
CMessageMailBox::CMessageMailBox(CWnd* pParent /*=NULL*/)
        : CDialog(CMessageMailBox::IDD, pParent){
       MsgCode = ::RegisterWindowMessage(_T("MESSAGE_CODING_STRING"));
       ::ChangeWindowMessageFilter(MsgCode,MSGFLT_ADD);
    }

//Message Handler   
    afx_msg LRESULT CMessageMailBox::TextFromApp(WPARAM wParam,LPARAM lParam){
        ::MessageBox(NULL,L"message recieved",L"yea!",MB_OK);
        return 0L;
    }

原文

I am pulling my hair out on this one. I am trying to send a message to a window in another process. I keep getting Access Denied (0x5) from GetLastError() after calling SendMessage or PostMessage or PostThreadMessage. I have tried turning off UAC. I have also accounted for UIPI by ensuring that the Integrity Levels match accross processes. (I checked with Process Explorer from SysInternals, now MS) I also turned off Windows Defender with no luck. I can send a message to the window from inside the process just fine, but from outside I get bupkus! This seems like some sort of security issue but I have no idea what it is as both processes have the same Integrity Level (medium - decimal 8192)

Code from DLL sending the message

UINT MsgCode = ::RegisterWindowMessage(_T("MESSAGE_CODING_STRING"));
::ChangeWindowMessageFilter(MsgCode,MSGFLT_ADD);
::PostMessage(hwnd1,MsgCode,(WPARAM)1,(LPARAM)1);
DWORD errorcode = ::GetLastError();

Selected Code from recieving Window

BEGIN_MESSAGE_MAP(CMessageMailBox, CDialog)
    ON_REGISTERED_MESSAGE(MsgCode, TextFromApp)
END_MESSAGE_MAP()

// Class Constructor    
CMessageMailBox::CMessageMailBox(CWnd* pParent /*=NULL*/)
        : CDialog(CMessageMailBox::IDD, pParent){
       MsgCode = ::RegisterWindowMessage(_T("MESSAGE_CODING_STRING"));
       ::ChangeWindowMessageFilter(MsgCode,MSGFLT_ADD);
    }

//Message Handler   
    afx_msg LRESULT CMessageMailBox::TextFromApp(WPARAM wParam,LPARAM lParam){
        ::MessageBox(NULL,L"message recieved",L"yea!",MB_OK);
        return 0L;
    }

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