NSTask

gistfile1.m

    NSTask *task = [[NSTask alloc] init];
    NSPipe *pipe = [[NSPipe alloc] init];
    [task setStandardOutput:pipe];
     

    NSString *launchPath = @"/Applications/Preview.app/Contents/MacOS/Preview";
    NSArray *args_ = [NSArray arrayWithObjects:@"/Users/katagiriso/Documents/tmp.pdf",nil];
    
    [task setLaunchPath:launchPath];
    [task setArguments:args_];
    
    [task launch];
    //[task waitUntilExit];
    
    //NSFileHandle *handle = [pipe fileHandleForReading];
    //NSData *data = [handle readDataToEndOfFile];
    
    [task release];
    [pipe release];