在Windows 7中的注册表行为奇怪 [英] Reading Registry in Windows 7 behaving strangely

问题描述

我想在Windows 7中读取注册表的（默认）值在c ++，以下是我使用的代码：

  string GetSZValueUnique（HKEY openKey，const char * regkey，const char * keyName）
 {
 HKEY hKey = 0; 
 BYTE data [512]; 
 DWORD szsize = 512; 
 string value; 
 
 LONG retValue = RegOpenKeyEx（openKey，regkey，0，KEY_READ，& hKey）; 
 
 if（retValue == ERROR_SUCCESS）
 {
 LONG retV = RegQueryValueEx（hKey，keyName，0，0，data，& szsize）; 
 if（retV == ERROR_SUCCESS）
 {
 char * _value = reinterpret_cast< char *>（data）; 
 value = _ value; 
 
 RegCloseKey（hKey）; 
返回值; 
} 
 else 
 {
 char msg [512]; 
 FormatMessage（FORMAT_MESSAGE_FROM_SYSTEM，0，（DWORD）retV，0，& msg [0]，512,0）; 
 error_string =& msg [0]; 
 MessageBox（0，error_string.c_str（），Query：GetSZValueUnique，0）; 
} 
} 
 else 
 {
 char msg [512]; 
 FormatMessage（FORMAT_MESSAGE_FROM_SYSTEM，0，（DWORD）retV，0，& msg [0]，512,0）; 
 error_string =& msg [0]; 
 MessageBox（0，error_string.c_str（），Open：GetSZValueUnique，0）; 
} 
 
 RegCloseKey（hKey）; 
 return; 
} 
  

这是我调用上述函数的方法：

  string ts3 = GetSZValueUnique（HKEY_LOCAL_MACHINE，SOFTWARE\\TeamSpeak 3 Client\\， ）; 
 if（！ts3.empty（））
 MessageBox（0，ts3.c_str（），GetSZValueUnique，0）; 
 

对于某些键，它适用于某些不适用：例如，它适用于Adobe ，TrendMicro，CheckPoint，RegisteredApplications而不是7-Zip，RTLSetup，Sonic，TeamSpeak 3 Client

I

编辑：我已经检查了带有（默认）值的代码，并且其他值，对于键不工作它从来没有经过*if（retValue == ERROR_SUCCESS）*检查，我总是得到指定的文件未找到错误。对于其工作的键，它通过* if（retValue == ERROR_SUCCESS）*检查并返回值，如果它的存在，如果它不存在它只是显示错误消息指定的文件未找到。

编辑2：我再次检查：似乎它的工作原理的键在Wow6432Node SOFTWARE ... hmmm ...所以我如何使它工作？

解决方案

RegOpenKeyEx 参数中的 samDesired 参数中的 b> b> b b strong>如果您要从应用程序中访问Wow6432Node密钥，即 32位密钥。

KEY_WOW64_64KEY 如果您想要从应用程式存取正常键（例如 64位元键），请选择 RegOpenKeyEx 的「strong> samDesired 」参数。

注意：@WhozCraig在合适链接的评论中已经清除了您的疑问。如果他回答，请接受我的答案。

I am trying to read registry's "(Default)" values in Windows 7 in c++, and following is the code I am using:

string GetSZValueUnique( HKEY openKey, const char* regkey, const char* keyName )
{
   HKEY hKey = 0;
   BYTE data[512] ;
   DWORD szsize = 512 ;
   string value ;

   LONG retValue = RegOpenKeyEx( openKey, regkey, 0, KEY_READ, &hKey ) ;

   if ( retValue == ERROR_SUCCESS )
   {
        LONG retV = RegQueryValueEx( hKey, keyName, 0, 0, data, &szsize ) ;
        if ( retV == ERROR_SUCCESS )
        {
           char* _value = reinterpret_cast<char*>(data) ;
           value = _value ;

           RegCloseKey (hKey) ;
           return value ;
        }
        else
        {
            char msg[512] ;
            FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,0,(DWORD)retV,0,&msg[0],512,0) ;
            error_string = &msg[0];
            MessageBox( 0, error_string.c_str(), "Query : GetSZValueUnique", 0 );
        }
    }
    else
    {
        char msg[512] ;
        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,0,(DWORD)retV,0,&msg[0],512,0) ;
        error_string = &msg[0];
        MessageBox( 0, error_string.c_str(), "Open : GetSZValueUnique", 0 );
    }

    RegCloseKey (hKey) ;
    return "" ;
}

And this is how I am calling the above function :

string ts3 = GetSZValueUnique( HKEY_LOCAL_MACHINE, "SOFTWARE\\TeamSpeak 3 Client\\", "" );
if ( !ts3.empty() )
    MessageBox( 0, ts3.c_str(), "GetSZValueUnique", 0 );

For some Keys it works for some it doesn't : For example, it works for "Adobe", "TrendMicro", "CheckPoint", "RegisteredApplications" but not for "7-Zip", "RTLSetup", "Sonic", "TeamSpeak 3 Client"

I am out of ideas now, can somebody point out what's wrong ?

EDIT: I have checked the code with "(Default)" values and other values as well, for keys its not working it never goes past the *"if ( retValue == ERROR_SUCCESS )"* check and I always get "Specified file not found" error. For keys its working, it gets past the "*if ( retValue == ERROR_SUCCESS )*" check and returns the value if its present, if its not present it simply displays the error message "Specified file not found".

EDIT 2: I Checked again : and it seems the keys it works for have their corresponding clone in "Wow6432Node" subkey under SOFTWARE... hmmm... so how do I get it working ?

解决方案

You can specify the flag::

1. "KEY_WOW64_32KEY" in "samDesired" parameter of the RegOpenKeyEx if you want to access Wow6432Node Keys i.e., 32-bit keys from your app.
2. "KEY_WOW64_64KEY" in "samDesired" parameter of the RegOpenKeyEx if you want to access normal Keys i.e., 64-bit keys from your app.

Note:: Your doubt has already been cleared by @WhozCraig in comments with the suitable links. If he answers, do accept his answer over mine.

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