_chdrive odd results

[cyreon]

Okay maybe I'm doing this completely wrong, and it does seem like a very basic question. But even using MSDN examples I believe I have it exactly the same. With some slight changes for better error checking. Well here is the code:

// find all available hard drives
		for( i=0 ; i<26 ; i++ )
		{
			printf("Checking %c drive.\n", i+'A');
			// available drive
			if( !_chdrive(i) )
			{
				// start scanning drive
				printf("Scanning drive %c.\n", i+'A');
				sprintf(path, "%c:\\*", i+'A');
				hFind = FindFirstFile(path, &FindFileData);
				if( hFind == INVALID_HANDLE_VALUE )
				{
					switch(GetLastError())
					{
						case 3:							return(NULL);						break;

						default:
							printf("Cannot scan through drive %c. (%d)\n", i+'A', GetLastError());
							break;
					}
				}
				else ScanFolder(pfFiles, path, search, hFind, FindFileData);
			}
		}

Now my problem is this: My program will only try to scan through the D drive (and I don't have a D drive). But will skip over A, C, E, F, etc. all the drive letters that I actually am using. Can anyone tell me why this is? ScanFolder is just a function that is recursively setup to scan through an entire directory for the search criteria with each file. Each time a new folder is found, it will call itself to scan through the new directory. But it doesn't even get that far so I haven't been able to test it.

Thanks,
cyreon

[Darryl]

Contrary to most programming practices _chdrive(drive_number) is not 0 based but 1 based, so 1 = a, 2=b, and 3 = c, (and not D and your code will report) 0 is an invalid drive.

[cyreon]

Thanks. That fixed the problem, with a couple other adjustments.