Calling methods after comparing string objects from NSArray Cocoa - objective-c

Question

I am selecting files through this code:
- (IBAction)selectFile:(id)sender {
// Create the File Open Dialog class.
NSOpenPanel* openDlg = [NSOpenPanel openPanel];
[openDlg setPrompt:#"Select"];
fileTypes = [NSArray arrayWithObjects:#"wmv", #"3gp", #"mp4", #"avi", #"mp3", #"mma", #"wav", #"jpeg", #"png", #"jpg", #"tiff", nil];
// NSArray *JpegfileTypes = [NSArray arrayWithObjects:#"jpeg", #"png", #"jpg", #"tiff", #"mp3" nil];
// Enable the selection of files in the dialog.
[openDlg setCanChooseFiles:YES];
//Enable multiple selection of files
[openDlg setAllowsMultipleSelection:YES];
// Enable the selection of directories in the dialog.
[openDlg setCanChooseDirectories:YES];
// Display the dialog. If the OK button was pressed,
// process the files.
if ( [openDlg runModalForDirectory:nil file:nil types:fileTypes] == NSOKButton )
{
// Get an array containing the full filenames of all
// files and directories selected.
files = [[openDlg filenames] retain];
int i; // Loop counter.
// Loop through all the files and process them.
for( i = 0; i < [files count]; i++ )
{
NSString *tempFilePath = [files objectAtIndex:i];
NSLog(#"tempFilePath::: %#",tempFilePath);
inputFilePath = [[files objectAtIndex:i] retain];
NSLog(#"filename::: %#", inputFilePath);
// Do something with the filename.
[selectedFile setStringValue:inputFilePath];
NSLog(#"selectedFile:::: %#", selectedFile);
}
}
}
Then after selection I have used this code to process the selected file.
- (IBAction)setMessage:(id)sender {
[fileGenProgress startAnimation:self];
NSString *message = [[NSString alloc] initWithFormat:#"Started"];
[lblMessage setStringValue:message];
[message release];
[self startProcessingVideoFile];
[self startProcessingAudioFile];
[self startProcessingJpg];
}
The issue I am facing is that, I am not getting that how would I compare the different strings like if the selected file was 3gp/mp4 or jpg or mp3. As if user has selected some video file then the method [self startProcessingVideoFile]; will run and if he has selected some JPG or PNG etc file then [self startProcessingAudioFile]; method will run.
As selected will be having a path not only the extension of the file. So in this scenario how can I force the - (IBAction)setMessage:(id)sender method to run the appropriate method.

Answer 1

You can get string's extension (format) like this:
NSString *extension = [stringPath pathExtension];
And for comparing now it's very easy when You know what extension Your file is. For example:
NSLog(extension);
if ([extension isEqualToString:#"3gp"] || [ext isEqualToString:#"mp4"]) {
[self startProcessingVideoFile];
}
and etc.
Update:
Your IBAction:SetMessage should look like this:
- (IBAction)setMessage:(id)sender {
[fileGenProgress startAnimation:self];
NSString *message = [[NSString alloc] initWithFormat:#"Started"];
[lblMessage setStringValue:message];
[message release];
NSString *extension = [inputFilePath pathExtension];
NSLog(extension);
if ([extension isEqualToString:#"3gp"] || [ext isEqualToString:#"mp4"]) {
[self startProcessingVideoFile];
}
// And etc for others formats.
//[self startProcessingAudioFile];
//[self startProcessingJpg];
}