Can I use my own filename when using NSTemporaryDirectory - objective-c

Question

I am generating a PDF file and saving it to my device before e-mailing it from within my application. At the moment it does not get cleared down either manually or automatically so I was looking at NSTemporaryDirectory. I have looked at various sites and also on here for the answer to my specific query but cannot find it.
I have the following function:
+(NSString *)getTempFilePathName {
NSString *tempFilePathName = nil;
NSString *tempFileTemplate = [NSTemporaryDirectory() stringByAppendingPathComponent:#"tempfile.XXXXXX"];
const char *tempFileTemplateCString = [tempFileTemplate fileSystemRepresentation];
char *tempFileNameCString = (char *)malloc(strlen(tempFileTemplateCString) + 1);
strcpy(tempFileNameCString, tempFileTemplateCString);
int fileDescriptor = mkstemp(tempFileNameCString);
if (fileDescriptor != -1) {
// File opened successfully
tempFilePathName = [[NSFileManager defaultManager] stringWithFileSystemRepresentation:tempFileNameCString length:strlen(tempFileNameCString)];
close(fileDescriptor);
}
free(tempFileNameCString);
return tempFilePathName;
}
This returns me an NSString with the full path and filename to a temp file ending with the 'XXXXXX' component of the filename replaced with unique combo of letters and numbers. As I am using this to save a PDF file, I need to fix the 'XXXXXX' bit with the extension ".PDF". Preferably I'd like to also specify the filename itself too so something like "Order-123.PDF".
Can I just edit my method to pass in a filename and use that in the stringByAppendingPathComponent parameter? Is the directory name generated unique per call to this method?

Answer 1

I have solved this by myself. After the line that calls the above routine I do:
NSString *newFilePath = [tempNameStub stringByAppendingPathExtension:#"pdf"];
Which adds .pdf to the end.