使用WH_GETMESSAGE挂钩时为什么WM_CHAR消息被发送两次到某些应用程序？ [英] Why the WM_CHAR message is being posted twice to certain applications when using a WH_GETMESSAGE hook?

问题描述

这个代码有什么问题。它在记事本，Iexplorer，文件夹/文件名，Windows资源管理器地址栏中按预期工作，但不在wordpad，firefox，adobe reader中。



if（msg-> message == WM_CHAR）......部分代码执行两次或三次，即使使用WM_LBUTTONDBLCLK消息。为什么这部分在某些应用程序中重复。根据此代码messagebox func应执行一次。

What is the problem with this code.It's working as expected in notepad,Iexplorer,folder/file names,windows explorer address bar,but not in wordpad,firefox,adobe reader.

if(msg->message==WM_CHAR)...... part of code executing twice or thrice,even with WM_LBUTTONDBLCLK message.Why this part repeating in some applications.according to this code messagebox func should execute once.

LRESULT CALLBACK procCharMsg(int nCode,WPARAM wParam, LPARAM lParam)
{
    MSG *msg;    
    HWND ctrHwnd = NULL;

    if(nCode >=0 && nCode == HC_ACTION)     
    {
        msg=(MSG *)lParam;          
        if(msg->message==WM_CHAR)           
        {
            ctrHwnd = msg->hwnd;

            wchar_t szBuff[64];
            wsprintf(szBuff, L"%p", ctrHwnd);
            MessageBox(NULL, szBuff, L"Title", MB_OK);

        }
    }
        return CallNextHookEx(hkKey,nCode,wParam,lParam);//passing this message to target application
}

我尝试了什么：



无法解决问题。所以没有尝试过。

What I have tried:

can't catch problem.so nothing tried.

推荐答案

失败者有一些共同之处，他们都是恶意木马的目标

The ones that fail have something in common they are all targets of malicious trojans

wordpad,firefox,adobe reader

猜测他们有保护方案可以完全停止你想要做的事情。

At a guess they have protection schemes to stop exactly what you are trying to do.

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