Erroroem

#include <stdio.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>

#define TOTALBYTES    8192
#define BYTEINCREMENT 4096
#define MODEMFOUND 1
#define MODEMNOTFOUND 0


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{


       typedef BOOL ( *fptr1 ) ( PCWSTR , DWORD, PVOID );
           fptr1 SetupUninstallOEMInf;

       HDEVINFO hDevInfo;
       SP_DEVINFO_DATA DeviceInfoData;
       DWORD i;
       int DeviceFound_Flag = 0;

        // initialisations for RegQuery
       DWORD BufferSize = TOTALBYTES;
       DWORD cbData;
       DWORD dwRet;
       BOOL Modem_Flag = MODEMNOTFOUND;

       PPERF_DATA_BLOCK PerfData = (PPERF_DATA_BLOCK) malloc( BufferSize );
       cbData = BufferSize;


       HINSTANCE hinstLib = LoadLibrary( "Setupapi.dll" );

       if ( hinstLib == NULL ) {
        printf ("Load library failed\n");
       }

       SetupUninstallOEMInf = (fptr1)GetProcAddress(hinstLib, "SetupUninstallOEMInfA");


       hDevInfo = SetupDiGetClassDevs ( NULL,
           NULL, // Enumerator
           0,
           DIGCF_ALLCLASSES );

       if (hDevInfo == INVALID_HANDLE_VALUE)
       {
           // Insert error handling here.
           //MessageBox(NULL, "Device not found!!", TEXT ( "Device Status!!" ),
                                 //0 );

           return 1;
       }

       // Enumerate through all devices in Set.

       DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
       if ( (SetupDiEnumDeviceInfo(hDevInfo,0,
           &DeviceInfoData ) == 0 ) ) {
           MessageBox(NULL, "Device not found!!", TEXT ( "Device Status!!" ),
                                 0 );

           }




       for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
           &DeviceInfoData);i++)
       {
            DWORD DataT;
            LPTSTR buffer = NULL;
            DWORD buffersize = 0;
            LPTSTR temp_array = NULL;
           //
           // Call function with null to begin with,
           // then use the returned buffer size (doubled)
           // to Alloc the buffer. Keep calling until
           // success or an unknown failure.
           //
           //  Double the returned buffersize to correct
           //  for underlying legacy CM functions that
           //  return an incorrect buffersize value on
           //  DBCS/MBCS systems.
           //
           while (!SetupDiGetDeviceRegistryProperty(
               hDevInfo,
               &DeviceInfoData,
               SPDRP_HARDWAREID,
               &DataT,
               (PBYTE)buffer,
               buffersize,
               &buffersize))
           {

            if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
               {
                   // Change the buffer size.
                   if (buffer) LocalFree(buffer);
                   // Double the size to avoid problems on
                   // W2k MBCS systems per KB 888609.
                   buffer = LocalAlloc(LPTR,buffersize * 2);
               }
               else
               {
                   // Insert error handling here.
                   break;
               }
           }

             if ( buffer != NULL ) {

            if ( ( strnicmp ( buffer , "USB\\VID_16DE&PID_0010", strlen ("USB\\VID_16DE&PID_0010") ) == 0 ) ||
                ( strnicmp ( buffer , "USB\\VID_16DE&PID_001", strlen ("USB\\VID_16DE&PID_001") ) == 0 ) ||
                ( strnicmp ( buffer , "USB\\VID_16DE&PID_002", strlen ("USB\\VID_16DE&PID_002") ) == 0 ) ||
                ( strnicmp ( buffer , "USB\\VID_16DE&PID_003", strlen ("USB\\VID_16DE&PID_003") ) == 0 )   ) {
                DeviceFound_Flag = 1;

                HKEY hDeviceKey = SetupDiOpenDevRegKey ( hDevInfo, &DeviceInfoData,
                DICS_FLAG_GLOBAL,
                0,
                DIREG_DRV,
                KEY_READ);


                dwRet = RegQueryValueEx (hDeviceKey, "InfPath", NULL, NULL , (LPBYTE) PerfData, &cbData );
                //printf ("%s\n", PerfData);
                ////////////////////////
                while( dwRet == ERROR_MORE_DATA )
                {
                // Get a buffer that is big enough.
                    printf ("inside while loop\n");

                    BufferSize += BYTEINCREMENT;
                    PerfData = (PPERF_DATA_BLOCK) realloc( PerfData, BufferSize );
                    cbData = BufferSize;

                //printf(".");
                dwRet = RegQueryValueEx ( hDeviceKey, "InfPath", NULL, NULL, (LPBYTE) PerfData, &cbData );
                }

                //printf("\n\nFinal buffer size is %d %s\n", BufferSize, PerfData);
                if( dwRet == ERROR_SUCCESS ) {
                }
                else printf ( "\nRegQueryValueEx failed (%d)\n", dwRet );

                printf ( "%s   %s\n",buffer,PerfData );

            SetupUninstallOEMInf ( (PCWSTR)PerfData, 0, NULL );

             } else {
                    continue;
               }
            }

           if (buffer)
           LocalFree(buffer);

       }


       if ( GetLastError()!=NO_ERROR &&
            GetLastError()!=ERROR_NO_MORE_ITEMS )
       {
           // Insert error handling here.
           return 1;
       }

       //  Cleanup
       SetupDiDestroyDeviceInfoList(hDevInfo);




       return 0;
   }