Question

How could I choose a file after clicking a select button? When I click the select button it should be opened a popup window that I can select the file from my harddisk.

-(IBAction)select:(id)sender{
    NSOpenPanel* dlg =[NSOpenPanel openPanel];
    [dlg setCanChooseFiles:YES];
    [dlg setCanChooseDirectories:YES];
}

Answer 1

EDIT (after code posted):

You are not actually opening the panel, so you need something like:

NSInteger button = [dlg runModal];
if (button == NSFileHandlingPanelOKButton)
{
    NSURL *chosenURL = [[dlg URLs] objectAtIndex:0];
    // Do something with chosen file
}