How to read a value from the Windows registry

Question!

Given the key for some registry value (e.g. HKEY_LOCAL_MACHINE\blah\blah\blah\foo) how can I:

  1. Safely determine that such a key exists.
  2. Programmatically (i.e. with code) get its value.

I have absolutely no intention of writing anything back to the registry (for the duration of my career if I can help it). So we can skip the lecture about every molecule in my body exploding at the speed of light if I write to the registry incorrectly.

Prefer answers in C++, but mostly just need to know what the special Windows API incantation to get at the value is.

By : nolandda


Answers
const CString REG_SW_GROUP_I_WANT = _T("SOFTWARE\\My Corporation\\My Package\\Group I want");
const CString REG_KEY_I_WANT= _T("Key Name");

CRegKey regKey;
DWORD   dwValue = 0;

if(ERROR_SUCCESS != regKey.Open(HKEY_LOCAL_MACHINE, REG_SW_GROUP_I_WANT))
{
  m_pobLogger->LogError(_T("CRegKey::Open failed in Method"));
  regKey.Close();
  goto Function_Exit;
}
if( ERROR_SUCCESS != regKey.QueryValue( dwValue, REG_KEY_I_WANT))
{
  m_pobLogger->LogError(_T("CRegKey::QueryValue Failed in Method"));
  regKey.Close();
  goto Function_Exit;
}

// dwValue has the stuff now - use for further processing
By : Gishu


Here is some pseudo-code to retrieve the following:

  1. If a registry key exists
  2. What the default value is for that registry key
  3. What a string value is
  4. What a DWORD value is

Example code:

Include the library dependency: Advapi32.lib

HKEY hKey;
LONG lRes = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Perl", 0, KEY_READ, &hKey);
bool bExistsAndSuccess (lRes == ERROR_SUCCESS);
bool bDoesNotExistsSpecifically (lRes == ERROR_FILE_NOT_FOUND);
std::wstring strValueOfBinDir;
std::wstring strKeyDefaultValue;
GetStringRegKey(hKey, L"BinDir", strValueOfBinDir, L"bad");
GetStringRegKey(hKey, L"", strKeyDefaultValue, L"bad");

LONG GetDWORDRegKey(HKEY hKey, const std::wstring &strValueName, DWORD &nValue, DWORD nDefaultValue)
{
    nValue = nDefaultValue;
    DWORD dwBufferSize(sizeof(DWORD));
    DWORD nResult(0);
    LONG nError = ::RegQueryValueExW(hKey,
        strValueName.c_str(),
        0,
        NULL,
        reinterpret_cast<LPBYTE>(&nResult),
        &dwBufferSize);
    if (ERROR_SUCCESS == nError)
    {
        nValue = nResult;
    }
    return nError;
}


LONG GetBoolRegKey(HKEY hKey, const std::wstring &strValueName, bool &bValue, bool bDefaultValue)
{
    DWORD nDefValue((bDefaultValue) ? 1 : 0);
    DWORD nResult(nDefValue);
    LONG nError = GetDWORDRegKey(hKey, strValueName.c_str(), nResult, nDefValue);
    if (ERROR_SUCCESS == nError)
    {
        bValue = (nResult != 0) ? true : false;
    }
    return nError;
}


LONG GetStringRegKey(HKEY hKey, const std::wstring &strValueName, std::wstring &strValue, const std::wstring &strDefaultValue)
{
    strValue = strDefaultValue;
    WCHAR szBuffer[512];
    DWORD dwBufferSize = sizeof(szBuffer);
    ULONG nError;
    nError = RegQueryValueExW(hKey, strValueName.c_str(), 0, NULL, (LPBYTE)szBuffer, &dwBufferSize);
    if (ERROR_SUCCESS == nError)
    {
        strValue = szBuffer;
    }
    return nError;
}


    #include <windows.h>
    #include <map>
    #include <string>
    #include <stdio.h>
    #include <string.h>
    #include <tr1/stdint.h>
    using namespace std;
   void printerr(DWORD dwerror) {
        LPVOID lpMsgBuf;
        FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER |
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dwerror,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
            (LPTSTR) &lpMsgBuf,
            0,
            NULL
        );
        // Process any inserts in lpMsgBuf.
        // ...
        // Display the string.
        if (isOut) {
            fprintf(fout, "%s\n", lpMsgBuf);
        } else {
            printf("%s\n", lpMsgBuf);
        }
        // Free the buffer.
        LocalFree(lpMsgBuf);
    }



    bool regreadSZ(string& hkey, string& subkey, string& value, string& returnvalue, string& regValueType) {
        char s[128000];
        map<string,HKEY> keys;
        keys["HKEY_CLASSES_ROOT"]=HKEY_CLASSES_ROOT;
        keys["HKEY_CURRENT_CONFIG"]=HKEY_CURRENT_CONFIG; //DID NOT SURVIVE?
        keys["HKEY_CURRENT_USER"]=HKEY_CURRENT_USER;
        keys["HKEY_LOCAL_MACHINE"]=HKEY_LOCAL_MACHINE;
        keys["HKEY_USERS"]=HKEY_USERS;
        HKEY mykey;

        map<string,DWORD> valuetypes;
        valuetypes["REG_SZ"]=REG_SZ;
        valuetypes["REG_EXPAND_SZ"]=REG_EXPAND_SZ;
        valuetypes["REG_MULTI_SZ"]=REG_MULTI_SZ; //probably can't use this.

        LONG retval=RegOpenKeyEx(
            keys[hkey],         // handle to open key
            subkey.c_str(),  // subkey name
            0,   // reserved
            KEY_READ, // security access mask
            &mykey    // handle to open key
        );
        if (ERROR_SUCCESS != retval) {printerr(retval); return false;}
        DWORD slen=128000;
        DWORD valuetype = valuetypes[regValueType];
        retval=RegQueryValueEx(
          mykey,            // handle to key
          value.c_str(),  // value name
          NULL,   // reserved
          (LPDWORD) &valuetype,       // type buffer
          (LPBYTE)s,        // data buffer
          (LPDWORD) &slen      // size of data buffer
        );
        switch(retval) {
            case ERROR_SUCCESS:
                //if (isOut) {
                //    fprintf(fout,"RegQueryValueEx():ERROR_SUCCESS:succeeded.\n");
                //} else {
                //    printf("RegQueryValueEx():ERROR_SUCCESS:succeeded.\n");
                //}
                break;
            case ERROR_MORE_DATA:
                //what do I do now?  data buffer is too small.
                if (isOut) {
                    fprintf(fout,"RegQueryValueEx():ERROR_MORE_DATA: need bigger buffer.\n");
                } else {
                    printf("RegQueryValueEx():ERROR_MORE_DATA: need bigger buffer.\n");
                }
                return false;
            case ERROR_FILE_NOT_FOUND:
                if (isOut) {
                    fprintf(fout,"RegQueryValueEx():ERROR_FILE_NOT_FOUND: registry value does not exist.\n");
                } else {
                    printf("RegQueryValueEx():ERROR_FILE_NOT_FOUND: registry value does not exist.\n");
                }
                return false;
            default:
                if (isOut) {
                    fprintf(fout,"RegQueryValueEx():unknown error type 0x%lx.\n", retval);
                } else {
                    printf("RegQueryValueEx():unknown error type 0x%lx.\n", retval);
                }
                return false;

        }
        retval=RegCloseKey(mykey);
        if (ERROR_SUCCESS != retval) {printerr(retval); return false;}

        returnvalue = s;
        return true;
    }


This video can help you solving your question :)
By: admin