NSTask sample

NSTask sample

#import <Foundation/Foundation.h>

void doTaskAndCapture(void);
void doTaskAndCapture()
{
	@try
	{
		// Set up the process
		NSTask *t = [[[NSTask alloc] init] autorelease];
		[t setLaunchPath:@"/bin/ls"];
		[t setArguments:[NSArray arrayWithObjects:@"-1", @"/", nil]];
		
		// Set the pipe to the standard output and error to get the results of the command
		NSPipe *p = [[[NSPipe alloc] init] autorelease];
		[t setStandardOutput:p];
		[t setStandardError:p];
		
		// Launch (forks) the process
		[t launch]; // raises an exception if something went wrong
	
		// Prepare to read
		NSFileHandle *readHandle = [p fileHandleForReading];
		NSData *inData = nil;
		NSMutableData *totalData = [[[NSMutableData alloc] init] autorelease];
		
		while ((inData = [readHandle availableData]) &&
			[inData length]) {
			[totalData appendData:inData];
		}
		
		// Polls the runloop until its finished 
		[t waitUntilExit];
		
		NSLog(@"Terminationstatus: %d", [t terminationStatus]);
		NSLog(@"Data recovered: %@", totalData);
		
	}
	@catch (NSException *e)
	{
		NSLog(@"Expection occurred %@", [e reason]);
	
	}
}

int main(int argc, char *argv[]) {
	@autoreleasepool {
		doTaskAndCapture();
	}
}

how does nstask write some infomation.for example. open a ssh,and when server give a "please input your passwd",then write the passwd into the nstask.

Look at the "expect" command

3Q for your sample