1 #include <stdio.h>
2 #include <string.h>
3 #include <stdlib.h>
4 #include <wchar.h>
5 #include <windows.h>
6 
7 int main( int argc, char **argv ) {
8   ULONG ResultSize;
9   PWCHAR WcharResult;
10   WCHAR ValueNameWC[100];
11   PCHAR CharResult;
12   HKEY RegKey;
13   int i;
14 
15   if( argc < 2 ) {
16     printf( "Usage: regqueryvalue [key] [value]\n" );
17     printf( "Returns an HKEY_LOCAL_MACHINE value from the given key.\n" );
18     return 1;
19   }
20 
21   if ( RegOpenKeyExA( HKEY_LOCAL_MACHINE, argv[1], 0, KEY_READ, &RegKey )
22       != 0 ) {
23     printf( "Could not open key %s\n", argv[1] );
24     return 2;
25   }
26 
27   for( i = 0; argv[2][i]; i++ ) ValueNameWC[i] = argv[2][i];
28   ValueNameWC[i] = 0;
29 
30   if(RegQueryValueExW( RegKey, ValueNameWC, NULL, NULL, NULL, &ResultSize )
31      != 0) {
32     printf( "The value %S does not exist.\n", ValueNameWC );
33     return 5;
34   }
35 
36   WcharResult = malloc( (ResultSize + 1) * sizeof(WCHAR) );
37 
38   if( !WcharResult ) {
39     printf( "Could not alloc %d wchars\n", (int)(ResultSize + 1) );
40     return 6;
41   }
42 
43   RegQueryValueExW( RegKey, ValueNameWC, NULL, NULL, (LPBYTE)WcharResult,
44 		    &ResultSize );
45 
46   printf( "wchar Value: %S\n", WcharResult );
47   fflush( stdout );
48 
49   RegQueryValueExA( RegKey, argv[2], NULL, NULL, NULL, &ResultSize );
50 
51   CharResult = malloc( ResultSize + 1 );
52 
53   if( !CharResult ) {
54     printf( "Could not alloc %d chars\n", (int)(ResultSize + 1) );
55     return 7;
56   }
57 
58   RegQueryValueExA( RegKey, argv[2], NULL, NULL, (PBYTE)CharResult, &ResultSize );
59 
60   printf( " char Value: %s\n", CharResult );
61   fflush( stdout );
62 
63   free( WcharResult );
64   free( CharResult );
65 
66   return 0;
67 }
68