C++读取注册表

GetRegValue.h:

#ifndef __GETREGVALUE_H__#define __GETREGVALUE_H__#include <string>//---------------------------------------------------------------//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 => stringstd::string ws2s(const std::wstring& ws);//可移植版本 string => wstringstd::wstring s2ws(const std::string& s);#endif //__GETREGVALUE_H__

GetRegValue.cpp

#include "stdafx.h"#include <Windows.h>#include "GetRegValue.h"//可移植版本 wstring => stringstd::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 => wstringstd::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 <string>#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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