NSPipeExample.m

// Demonstrates how to pipe a program from memory to Python interpreter.
// Adapted from http://borkware.com/quickies/one?topic=NSTask

#import <Foundation/Foundation.h>

static const char *prog = "print \"Hello, world!\";";

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    // insert code here...
	
	NSTask *task = [[NSTask alloc] init];
	[task setLaunchPath:@"/usr/bin/python"];
	
	NSPipe *readPipe = [NSPipe pipe];
	NSFileHandle *readHandle = [readPipe fileHandleForReading];
	
	NSPipe *writePipe = [NSPipe pipe];
	NSFileHandle *writeHandle = [writePipe fileHandleForWriting];

	[task setStandardInput:writePipe];
	[task setStandardOutput:readPipe];

	[task launch];
	
	NSData *progdata = [[NSData alloc] initWithBytes:(const void *)prog length:strlen(prog)];
	[writeHandle writeData:progdata];
	[writeHandle closeFile];
	
	NSMutableData *data = [[NSMutableData alloc] init];
	NSData *readData;
	
	while ((readData = [readHandle availableData]) && [readData length]) {
		[data appendData:readData];
	}
	
	NSString *resultString;
	resultString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
	NSLog(resultString);
	
	[task release];
	[data release];

    [pool drain];
    return 0;
}