C++读取注册表

GetRegValue.h:

#ifndef __GETREGVALUE_H__

#define __GETREGVALUE_H__

#include

//---------------------------------------------------------------

//function:

// GetRegValue 获取注册表中指定键的值

//Access:

// public

//Parameter:

// [in] int nKeyType - 注册表项的类型，传入的参数只可能是以下数值：

// 0:HKEY_CLASSES_ROOT

// 1:HKEY_CURRENT_USER

// 2:HKEY_LOCAL_MACHINE

// 3:HKEY_USERS

// 4:HKEY_PERFORMANCE_DATA

// 5:HKEY_CURRENT_CONFIG

// 6:HKEY_DYN_DATA

// 7:HKEY_CURRENT_USER_LOCAL_SETTINGS

// 8:HKEY_PERFORMANCE_TEXT

// 9:HKEY_PERFORMANCE_NLSTEXT

// [in] const std::string & strUrl - 要查找 的键的路径

// [in] const std::string & strKey - 指定的键

//Returns:

// std::string - 指定键的值

//Remarks:

// ...

//author: luoweifu

//---------------------------------------------------------------

std::string GetRegValue(int nKeyType, const std::string& strUrl, const std::string& strKey);

//可移植版本 wstring => string

std::string ws2s(const std::wstring& ws);

//可移植版本 string => wstring

std::wstring s2ws(const std::string& s);

#endif //__GETREGVALUE_H__

GetRegValue.cpp

#include "stdafx.h"

#include

#include "GetRegValue.h"

//可移植版本 wstring => string

std::string ws2s(const std::wstring& ws)

{

std::string curLocale = setlocale(LC_ALL, "");

const wchar_t* _Source = ws.c_str();

size_t _Dsize = wcstombs(NULL, _Source, 0) + 1;

char *_Dest = new char[_Dsize];

memset(_Dest,0,_Dsize);

wcstombs(_Dest,_Source,_Dsize);

std::string result = _Dest;

delete []_Dest;

setlocale(LC_ALL, curLocale.c_str());

return result;

}

//可移植版本 string => wstring

std::wstring s2ws(const std::string& s)

{

std::string curLocale = setlocale(LC_ALL, "");

const char* _Source = s.c_str();

size_t _Dsize = mbstowcs(NULL, _Source, 0) + 1;

wchar_t *_Dest = new wchar_t[_Dsize];

wmemset(_Dest, 0, _Dsize);

mbstowcs(_Dest,_Source,_Dsize);

std::wstring result = _Dest;

delete []_Dest;

setlocale(LC_ALL, curLocale.c_str());

return result;

}

std::string GetRegValue(int nKeyType, const std::string& strUrl, const std::string& strKey)

{

std::string strValue("");

HKEY hKey = NULL;

HKEY hKeyResult = NULL;

DWORD dwSize = 0;

DWORD dwDataType = 0;

std::wstring wstrUrl = s2ws(strUrl);

std::wstring wstrKey = s2ws(strKey);

switch(nKeyType)

{

case 0:

{

hKey = HKEY_CLASSES_ROOT;

break;

}

case 1:

{

hKey = HKEY_CURRENT_USER;

break;

}

case 2:

{

hKey = HKEY_LOCAL_MACHINE;

break;

}

case 3:

{

hKey = HKEY_USERS;

break;

}

case 4:

{

hKey = HKEY_PERFORMANCE_DATA;

break;

}

case 5:

{

hKey = HKEY_CURRENT_CONFIG;

break;

}

case 6:

{

hKey = HKEY_DYN_DATA;

break;

}

case 7:

{

hKey = HKEY_CURRENT_USER_LOCAL_SETTINGS;

break;

}

case 8:

{

hKey = HKEY_PERFORMANCE_TEXT;

break;

}

case 9:

{

hKey = HKEY_PERFORMANCE_NLSTEXT;

break;

}

default:

{

return strValue;

}

}

//打开注册表

if(ERROR_SUCCESS == ::RegOpenKeyEx(hKey, wstrUrl.c_str(), 0, KEY_QUERY_VALUE, &hKeyResult))

{

// 获取缓存的长度dwSize及类型dwDataType

::RegQueryValueEx(hKeyResult, wstrKey.c_str(), 0, &dwDataType, NULL, &dwSize);

switch (dwDataType)

{

case REG_MULTI_SZ:

{

//分配内存大小

BYTE* lpValue = new BYTE[dwSize];

//获取注册表中指定的键所对应的值

LONG lRet = ::RegQueryValueEx(hKeyResult, wstrKey.c_str(), 0, &dwDataType, lpValue, &dwSize);

delete[] lpValue;

break;

}

case REG_SZ:

{

//分配内存大小

wchar_t* lpValue = new wchar_t[dwSize];

memset(lpValue, 0, dwSize * sizeof(wchar_t));

//获取注册表中指定的键所对应的值

if (ERROR_SUCCESS == ::RegQueryValueEx(hKeyResult, wstrKey.c_str(), 0, &dwDataType, (LPBYTE)lpValue, &dwSize))

{

std::wstring wstrValue(lpValue);

strValue = ws2s(wstrValue);

}

delete[] lpValue;

break;

}

default:

break;

}

}

//关闭注册表

::RegCloseKey(hKeyResult);

return strValue;

}

测试代码：

#include "stdafx.h"

#include

#include "GetRegValue.h"

int _tmain(int argc, _TCHAR* argv[])

{

std::string strValue = GetRegValue(2, "SOFTWARE\\360Safe\\Liveup", "mid");

return 0;

}

结果：

strValue：

“ebd1360403764c9d48c585ef93a6eacbd89ded596f043f78e54eb0adeba7251d”

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