Najprostszy sposób odczytu wartości klucza rejestru na std :: string?

Question

Jaki jest najprostszy sposób odczytania wartości klucza rejestru na std :: String?

Say mam:

HKEY_LOCAL_MACHINE/SOFTWARE/MyApp/value1 = "some text" 
HKEY_LOCAL_MACHINE/SOFTWARE/MyApp/value2 = "some more text" 

Jak mogę dostać te wartości do std :: string w szybki sposób?

Answer 1

Mam bardzo stary kod, ale powinno dać dobry pomysł:

/** 
* @param location The location of the registry key. For example "Software\\Bethesda Softworks\\Morrowind" 
* @param name the name of the registry key, for example "Installed Path" 
* @return the value of the key or an empty string if an error occured. 
*/ 
std::string getRegKey(const std::string& location, const std::string& name){ 
    HKEY key; 
    TCHAR value[1024]; 
    DWORD bufLen = 1024*sizeof(TCHAR); 
    long ret; 
    ret = RegOpenKeyExA(HKEY_LOCAL_MACHINE, location.c_str(), 0, KEY_QUERY_VALUE, &key); 
    if(ret != ERROR_SUCCESS){ 
     return std::string(); 
    } 
    ret = RegQueryValueExA(key, name.c_str(), 0, 0, (LPBYTE) value, &bufLen); 
    RegCloseKey(key); 
    if ((ret != ERROR_SUCCESS) || (bufLen > 1024*sizeof(TCHAR))){ 
     return std::string(); 
    } 
    std::string stringValue = std::string(value, (size_t)bufLen - 1); 
    size_t i = stringValue.length(); 
    while(i > 0 && stringValue[i-1] == '\0'){ 
     --i; 
    } 
    return stringValue.substr(0,i); 
}