需要在可可应用中执行命令

Question

I am developing a macOS app using Objective-C that I want to run some commands same like terminal. Actually I want to run YOLO command from my application. I am using NSTask class for this. When I run the command through code, on task launch, I am getting error "Couldn't open file cfg/coco.data". The same command works fine with terminal but not in my application.

Here is my code:

NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath:@"/bin/bash"];

NSString *commandToRun = @"Desktop/darknet/ && ./darknet detect cfg/yolo.cfg   yolo.weights data/dog.jpg";

NSArray *arguments = [NSArray arrayWithObjects:
                      @"-c",
                      [NSString stringWithFormat:@"%@", commandToRun],
                      nil];
NSLog(@"run command: %@",commandToRun);
[task setArguments: arguments];

NSPipe *pipe;
pipe = [NSPipe pipe];
[task setStandardOutput: pipe];

NSFileHandle *file;
file = [pipe fileHandleForReading];

[task launch];

NSData *data;
data = [file readDataToEndOfFile];

NSString *output;
output = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];

Answer 1

NSTask is not a shell. It's more low-level than that. You can't run full shell expressions in there, just one command. So your commandToRun makes no sense, it should only be the path to the command to run.

Answer 2

您可以使用system c函数来运行命令，但是它对详细信息没有太多控制。