intelligent people!
Thanks so much for checking out my post.
Right now I'm running this:
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: #"/usr/bin/top"];
NSArray *arguments;
arguments = [NSArray arrayWithObjects: #"-stats", #"pid,cpu", nil];
[task setArguments: arguments];
NSPipe *pipe;
pipe = [NSPipe pipe];
[task setStandardOutput: pipe];
//The magic line that keeps your log where it belongs
[task setStandardInput:[NSPipe pipe]];
NSFileHandle *file;
file = [pipe fileHandleForReading];
[task launch];
and it is giving me the error:
Error opening terminal: unknown.
Any clues? Thanks again!
It seems as if it was my arguments:
arguments = [NSArray arrayWithObjects: #"-s", #"1",#"-l",#"3600",#"-stats",#"pid,cpu,time,command", nil];
Thanks!
Related
I am trying to run an executable on OS X from one of the other application.
NSPipe *pipe = [NSPipe pipe];
NSTask *task = [[NSTask alloc] init];
task.arguments = #[#"param1", #"param2", #"param3", #"param4"];
task.launchPath = #"/usr/bin/myApp";
[task setStandardOutput: pipe];
[task launch];
[task waitUntilExit];
NSFileHandle *file = [pipe fileHandleForReading];
NSData *output = [file readDataToEndOfFile];
NSString *outputString = [[NSString alloc] initWithData:output encoding:NSUTF8StringEncoding];
[file closeFile];
NSLog(#"%#",outputString);`
But the output is nothing. Though, I am sure NSTask is getting executed. I think I am doing something wrong with NSPipe. But I am still not seeing the expected output.
Thanks.
I am trying to run sudo command programmatically in my OS X app,
but i got these message
sudo: no tty present and no askpass program specified
Here is my code:
NSString *runCommand(NSString *commandToRun)
{
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: #"/bin/sh"];
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];
return output;
}
And i call this method like this :
runCommand(#"sudo purge");
Thanks for any help or sugession.
I'm trying to run a simple task which has to execute an echo "Hello World"
Well here is my code:
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath:#"/bin/bash"];
NSArray *arguments;
arguments = [NSArray arrayWithObjects:#"echo","hello world" nil];
[task setArguments: arguments];
NSPipe *pipe;
pipe = [NSPipe pipe];
[task setStandardOutput: pipe];
[task setStandardError: pipe];
NSFileHandle *file;
file = [pipe fileHandleForReading];
[task launch];
//...
//Code to get task response
Keep giving me no such file or directory error.. What am I doing wrong ?
The right way to execute a command is
bash -c "echo 'hello world'"
which means the arguments you should pass are
arguments = [NSArray arrayWithObjects:#"-c", #"echo 'hello world'", nil];
Can someone help me convert the following code into code that instead has two NSTasks for "cat" and "grep", showing how the two can be connected together with pipes? I suppose I would prefer the latter approach, since then I no longer have to worry about quoting and stuff.
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: #"/bin/sh"];
NSArray *arguments;
arguments = [NSArray arrayWithObjects: #"-c",
#"cat /usr/share/dict/words | grep -i ham", nil];
[task setArguments: arguments];
[task launch];
Update: Note that cat and grep are here just meant as (lousy) example. I still want to do this for commands that make more sense.
Use a instance of NSTask for each program and connect their standard inputs/outputs with NSPipe:
NSPipe *pipe = [[NSPipe alloc] init];
NSPipe *resultPipe = [[NSPipe alloc] init];
NSTask *task1 = [[NSTask alloc] init];
[task1 setLaunchPath: #"/bin/cat"];
[task1 setStandardOutput: pipe];
[task1 launch];
NSTask *task2 = [[NSTask alloc] init];
[task2 setLaunchPath: #"/bin/grep"];
[task2 setStandardInput: pipe];
[task2 setStandardOutput: resultPipe];
[task2 launch];
NSData *result = [[resultPipe fileHandleForReading] readDataToEndOfFile];
I am a beginner and I have a problem. I would like to use NSTask with the command "pbcopy". I tried this but it seems that it doesn't work :
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: #"/bin/echo"];
NSArray *arguments;
arguments = [NSArray arrayWithObjects: #"my-text-to-copy", #"| pbcopy", nil];
[task setArguments: arguments];
[task launch];
Any ideas ? Thanks.
It works fine :
NSTask *task = [[NSTask alloc] init];
NSPipe *pipe;
pipe = [NSPipe pipe];
task = [[NSTask alloc] init];
[task setLaunchPath:#"/bin/echo"];
[task setStandardOutput:pipe]; // write to pipe
[task setArguments: [NSArray arrayWithObjects: #"tmp", nil]];
[task launch];
[task waitUntilExit];
task = [[NSTask alloc] init];
[task setLaunchPath:#"/usr/bin/pbcopy"];
[task setStandardInput:pipe]; // read from pipe
[task launch];
[task waitUntilExit];
The pipe ("|") is a feature of the shell, not an argument to the command you're using. You have to use two NSTasks, one for echo and one for pbcopy and set up an NSPipe between them.
Btw, I'm assuming that you're just using this as an example. Otherwise it would be much simpler to use NSPasteboard for this.