C + + Read the registry

Was asked by a friend yesterday to help write a program that reads the registry in C + +. This friend is engaged in Java, certainly do not know how to write C + +! His demand is also strange: call a browser plugin with JS, through the plug-in to get the value of the specified key in the registry, the plugin must be written in C + +.

So I looked it up on the Internet "C + + Read the Registry", a search a large but are some beginners C + + people write, most can not use, and that the program is really powerless to spit groove ... Rage I spent one hours writing a, crap don't say, directly on the code:

C + + Read the registry

GetRegValue.h:

#ifndef __getregvalue_h__#define __GETREGVALUE_H__#include <string>//---------------------------------------------------------------//function://GetRegValue Gets the value of the specified key in the registry//access:// public//parameter://[in] int nkeytype-The type of the registry key, the passed-in parameter may be the following value only://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-The path of the key to find//[in] const std::string & strkey-specified key//returns://std::string-Specify the value of the key//remarks://          ...//author:luoweifu//---------------------------------------------------------------STD::stringGetRegValue (intNkeytype,Const STD::string& strURL,Const STD::string& Strkey);//Portable version wstring + = stringSTD::stringWs2s (Const STD::wstring& ws);//Portable Version string = wstringSTD:: Wstring S2ws (Const STD::string& S);#endif //__getregvalue_h__ 

GetRegValue.cpp

#include "stdafx.h"#include <Windows.h>#include "GetRegValue.h"//Portable version wstring + = stringSTD::stringWs2s (Const STD::wstring& ws) {STD::stringCurlocale = 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::stringresult = _dest;Delete[]_dest; SetLocale (Lc_all, Curlocale.c_str ());returnResult;}//Portable Version string = wstringSTD:: Wstring S2ws (Const STD::string& S) {STD::stringCurlocale = 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 ());returnResult;}STD::stringGetRegValue (intNkeytype,Const STD::string& strURL,Const STD::string& Strkey) {STD::stringstrvalue ("");    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:        {returnstrvalue; }    }//Open the registration form    if(Error_success = =:: RegOpenKeyEx (HKey, Wstrurl.c_str (),0, Key_query_value, &hkeyresult)) {//Gets the length of the cache dwsize and type Dwdatatype:: RegQueryValueEx (Hkeyresult, Wstrkey.c_str (),0, &dwdatatype, NULL, &dwsize);Switch(Dwdatatype) { CaseREG_MULTI_SZ: {//Allocate memory sizebyte* Lpvalue =NewByte[dwsize];//Gets the value corresponding to the key specified in the registryLONG Lret =:: RegQueryValueEx (Hkeyresult, Wstrkey.c_str (),0, &dwdatatype, Lpvalue, &dwsize);Delete[] lpvalue; Break; } CaseREG_SZ: {//Allocate memory size                wchar_t* Lpvalue =New wchar_t[dwsize];memset(Lpvalue,0, dwsize *sizeof(wchar_t));//Gets the value corresponding to the key specified in the registry                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; }    }//Close the registration form:: RegCloseKey (Hkeyresult);returnstrvalue;}

Test code:

#include "stdafx.h"#include <string>#include "GetRegValue.h"int _tmain(int argc, _TCHAR* argv[]){    std::string strValue = GetRegValue(2"SOFTWARE\\360Safe\\Liveup""mid");    return0;}

Results:
strvalue:
"EBD1360403764C9D48C585EF93A6EACBD89DED596F043F78E54EB0ADEBA7251D"

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C + + Read the registry