REGUTIL.C

//THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF 
//ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
//THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A 
// PARTICULAR PURPOSE. 
// 
// Copyright  1994-1997  Microsoft Corporation.  All Rights Reserved. 
// 
//  FILE: 
//    REGUTIL.C 
// 
//  PURPOSE: 
//    Registry access functions. 
// 
//  PLATFORMS: 
//    Windows 95, Windows NT 
// 
//  SPECIAL INSTRUCTIONS: N/A 
// 
 
// Windows Header Files: 
#pragma warning(disable:4001)   // Single-line comment warnings 
#pragma warning(disable:4115)   // Named type definition in parentheses 
#pragma warning(disable:4201)   // Nameless struct/union warning 
#pragma warning(disable:4214)   // Bit field types other than int warnings 
#pragma warning(disable:4514)   // Unreferenced inline function has been removed 
 
// Windows Header Files: 
#include <Windows.h> 
#include <WindowsX.h> 
 
// Restore the warnings--leave the single-line comment warning OFF 
#pragma warning(default:4115)   // Named type definition in parentheses 
#pragma warning(default:4201)   // Nameless struct/union warning 
#pragma warning(default:4214)   // Bit field types other than int warnings 
 
// C RunTime Header Files 
 
// Local Header Files 
 
// local definitions 
 
// default settings 
 
// external functions 
 
// external data 
 
// public data 
 
// private data 
 
// public functions 
 
////////////////////////////////////////////////////////////////////////// 
//  Function:  GetRegistryString 
// 
//  Description: 
//    Retrieves the string associated with the specified key in the registry. 
// 
//  Parameters: 
//    @@@ 
// 
//  Returns: 
//    LPTSTR   Pointer to registry string.  NULL upon failure. 
// 
//  Comments: 
// 
// 
////////////////////////////////////////////////////////////////////////// 
LPTSTR GetRegistryString(HKEY hKeyClass, LPTSTR lpszSubKey, LPTSTR lpszValueName) 
{ 
    // Local variables 
    HKEY          hKey;                 // Registry key 
    LPTSTR         lpszKeyValue;         // Buffer for key name 
    DWORD         dwKeySize;            // Size of key value 
    DWORD         dwKeyDataType;        // Type of data stored in key 
    LONG          lRC;                  // Return code 
 
    //  Initialize variables 
    dwKeyDataType = 0; 
    dwKeySize = 0; 
    hKey = NULL; 
 
    lRC = RegOpenKey(hKeyClass, lpszSubKey, &hKey); 
    if (lRC != ERROR_SUCCESS) 
    { 
        return(NULL); 
    } 
 
    // Got key, get value.  First, get the size of the key. 
    lRC = RegQueryValueEx(hKey, lpszValueName, NULL, NULL, NULL, &dwKeySize); 
    if (lRC != ERROR_SUCCESS) 
    { 
        return(NULL); 
    } 
    if (dwKeySize <= 1)  // Registry will return "" if no printers installed 
    { 
        return(NULL); 
    } 
 
    lpszKeyValue = GlobalAlloc(GPTR, (++dwKeySize)); 
    if (lpszKeyValue == NULL) 
    { 
        return(NULL); 
    } 
 
    lRC = RegQueryValueEx(hKey, lpszValueName, NULL, &dwKeyDataType, (LPBYTE)lpszKeyValue, &dwKeySize); 
    return(lpszKeyValue); 
}   // End of function GetRegistryString