How do I read Registry Key Value

Question

I am Creating the Registry Key using following code:

 LPCTSTR lpNDS= TEXT("SOFTWARE\\myKEY"); if(OK==ERROR_SUCCESS) { MessageBox ( NULL, "Success", _T("SimpleShlExt"), MB_ICONINFORMATION ); } else { MessageBox ( NULL, "Failed" , _T("SimpleShlExt"), MB_ICONINFORMATION ); } LONG openRes = RegCreateKeyEx( HKEY_LOCAL_MACHINE, lpNDS, 0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hRegKey, NULL); if (openRes!=ERROR_SUCCESS) MessageBox ( NULL, "Registry Createion Failed", _T("SimpleShlExt"), MB_ICONINFORMATION );

Now I am writing up to the Key using:

CSimpleShlExt::WriteToRegistry(LPSTR lpRegKeyVal) { LONG setRes = RegSetValueEx (hRegKey, "NDS", 0, REG_SZ, (LPBYTE)lpRegKeyVal, strlen(lpRegKeyVal)+1); CloseRegistryKey(); }

Now I am trying read the registry key value that I have created using WriteToRegistry function. I have tried with

RegOpenKeyEx(hRegKey,lpNDS,0,KEY_QUERY_VALUE,&hRegKey);

But this is failing.

Which function shall I use to read the value contained inside the key?

YeenFei · Accepted Answer · 2010-09-24 06:26:43Z

You can try something like :

TCHAR szValue[TEMP_STR_SIZE] = {0}; DWORD dwStorageSize = TEMP_STR_SIZE; LPBYTE lpStorage = reinterpret_cast<LPBYTE>(szValue); // In case of registry value retrieval failure if (ERROR_SUCCESS != RegQueryValueEx(hRegKey, _T("NDS"), 0, 0, lpStorage, &dwStorageSize)) { // Prompt error }

Edit:
Just noticed there are no subkey, changed my sample code

Now How will I get the Value of the RegistryKey, In My Case , I am writing some value to NDS. *lpStorage is an Integer. Sorry for being so simple but I am just new to this
if (ERROR_SUCCESS == RegQueryValueEx(hRegKey, _T("NDS"), 0, 0, (BYTE*)szValue, &dwBufSize)) { MessageBox ( NULL, szValue, _T("Value"), MB_ICONINFORMATION ); }

dirkgently · Accepted Answer · 2010-09-24 06:14:43Z

Which function shall I use to read the value contained inside the key?

Try RegQueryValue and/or RegEnumValue. Read the documentation to see which one suits your needs the best.

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