cocoa - 运行命令行工具时的 NSTask 和参数

Question

如何将参数(在本例中为主机)传递给此代码中的 NSTask？它不接受主机 NSString。例如，如果我通过 ping 传递主机值......

[NSArray arrayWithObjects:@"-c",@"ping -c 5 www.google.com",nil]

然后就可以了。但它不会单独考虑主机参数。感谢您提前提供的帮助。

task =  [[NSTask alloc] init];
[pipe release];
pipe = [[NSPipe alloc] init];
[task setStandardInput: [NSPipe pipe]];  

[task setLaunchPath:@"/bin/bash"];

NSArray *args = [NSArray arrayWithObjects:@"-c",@"ping -c 5",host,nil];

[task setArguments:args];
[task setStandardOutput:pipe];
NSFileHandle *fh = [pipe fileHandleForReading];

Answer 1

使用NSString类的stringWithFormat方法

 task =  [[NSTask alloc] init];
        [pipe release];
        pipe = [[NSPipe alloc] init];
        [task setStandardInput: [NSPipe pipe]];  

    [task setLaunchPath:@"path"];

    NSArray *args = [NSArray arrayWithObjects:@"-c",[NSString stringWithFormat: @"%@ %@ %@ %@",@"ping",@"-c",@"5",host],nil];

    [task setArguments:args];
    [task setStandardOutput:pipe];
    NSFileHandle *fh = [pipe fileHandleForReading];