In others words reaching out to the command line and running another command while capturing the standard output.
The reading that've been doing so far seems to indicate that this is a clear violation of the sandbox model and therefore not possible.
You can easily do this is in Android:
//This is just an example don't get hanged up on the actual command.
Process process = Runtime.getRuntime().exec("cat somefile.txt");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
logCatTraces.append(line);
logCatTraces.append("\r\n");
}
Related
I am writing instrumentation test for a scenario where data is not available on android emulator (api 16 and api 23). I tried the following code to disable data,
#Test
public void disconnectData() throws IOException {
String line;
Process p = Runtime.getRuntime().exec("svc data disable");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = in.readLine()) != null) {
System.out.println(line);
Log.d("asdf", line);
}
in.close();
}
It does not do anything. Data is not disabled. It simply passed without error. There is no output.
If I run the same command from terminal using adb, it works:
adb -s emulator-5554 shell
svc data disable
Alternative solution is to use mockwebserver. E.g.,
server.enqueue(new MockResponse()
.setResponseCode(HttpURLConnection.HTTP_INTERNAL_ERROR)
.setBody(getStringFromFile(getInstrumentation().getContext(), "login.json")));
The test below attempts to run the less pager command and return once
the user quits. The problem is that it doesn't wait for user input, it
just lists the entire file and exits. Platform: xubuntu 12.04, Dart
Editor build: 13049.
import 'dart:io';
void main() {
shell('less', ['/etc/mime.types'], (exitCode) => exit(exitCode));
}
void shell(String cmd, List<String> opts, void onExit(int exitCode)) {
var p = Process.start(cmd, opts);
p.stdout.pipe(stdout); // Process output to stdout.
stdin.pipe(p.stdin); // stdin to process input.
p.onExit = (exitCode) {
p.close();
onExit(exitCode);
};
}
The following CoffeeScript function (using nodejs I/O) works:
shell = (cmd, opts, callback) ->
process.stdin.pause()
child = spawn cmd, opts, customFds: [0, 1, 2]
child.on 'exit', (code) ->
process.stdin.resume()
callback code
How can I make this work in Dart?
John has a good example about how to look at user input. But doesn't answer your original question. Unfortunately your question doesn't fit with how Dart operates. The two examples you have, the Dart version and CoffeeScript/Node.js version, do two completely different things.
In your CoffeeScript version, the spawn command is actually creating a new process and then passing execution over to that new process. Basically you're program is not interactively communicating with the process, rather your user is interacting with the spawned process.
In Dart it is different, your program is interacting with the spawned process. It is not passing off execution to the new process. Basically what you are doing is piping the input/output to and from the new process to your program itself. Since your program doesn't have a 'window height' from the terminal, it passes all the information at once. What you're doing in dart is almost equivalent to:
less /etc/mime.types | cat
You can use Process.start() to interactively communicate with processes. But it is your program which is interactively communicating with the process, not the user. Thus you can write a dart program which will launch and automatically play 'zork' or 'adventure' for instance, or log into a remote server by looking at the prompts from process's output.
However, at current there is no way to simply pass execution to the spawned process. If you want to communicate the process output to a user, and then also take user input and send it back to a process it involves an additional layer. And even then, not all programs (such as less) behave the same as they do when launched from a shell environment.
Here's a basic structure for reading console input from the user. This example reads lines of text from the user, and exits on 'q':
import 'dart:io';
import 'dart:isolate';
final StringInputStream textStream = new StringInputStream(stdin);
void main() {
textStream.onLine = checkBuffer;
}
void checkBuffer(){
final line = textStream.readLine();
if (line == null) return;
if (line.trim().toLowerCase() == 'q'){
exit(0);
}
print('You wrote "$line". Now write something else!');
}
I'm new on MVC!
I want to run a process on my web app (not for bad purpose), this process can do something, for example it can write a text to a file .txt!
On my local PC, it work well but when I publish it on to host provider, it not work!
How I can do this?
This is my code:
string path = HttpContext.Current.Server.MapPath("~/App_Data/ModuleMaple/ModuleMaple.exe");
Process myproc = new Process();
myproc.StartInfo.FileName = path;
myproc.StartInfo.Arguments ="some argument"
myproc.StartInfo.UseShellExecute = false;
myproc.Start();
myproc.WaitForExit();
When Using SharpSSh and the SshExec class, I can't get the RunCommand to work, it always returns an empty string. When I debug the SharpSsh library it returns -1 when it tries to read the command from a stream. It works when I use the sftp class in the same library, but that class doesn't support all the ftp commands I need.
Here is a standard example, I can't get this to produce a correct result either
SshConnectionInfo input = Util.GetInput();
SshExec exec = new SshExec(input.Host, input.User);
if(input.Pass != null) exec.Password = input.Pass;
if(input.IdentityFile != null) exec.AddIdentityFile( input.IdentityFile );
Console.Write("Connecting...");
exec.Connect();
Console.WriteLine("OK");
while(true)
{
Console.Write("Enter a command to execute ['Enter' to cancel]: ");
string command = Console.ReadLine();
if(command=="")break;
string output = exec.RunCommand(command);
Console.WriteLine(output);
}
Console.Write("Disconnecting...");
exec.Close();
Console.WriteLine("OK");
Any ideas on how I can get the RunCommand function to run some commands?
Thanks for any help :)
To get the standard output and error streams from .RunCommand,
I'll repeat the answer I posted to: SharpSSH - SSHExec, run command, and wait 5 seconds for data!
You may want to try the following overload:
SshExec exec = new SshExec("192.168.0.1", "admin", "haha");
exec.Connect();
string stdOut = null;
string stdError = null;
exec.RunCommand("interface wireless scan wlan1 duration=5", ref stdOut, ref stdError);
Console.WriteLine(stdOut);
exec.Close();
If their API does what the name implies, it should put the standard output of your command in stdOut and the standard error in stdError.
For more information about standard streams, check this out: http://en.wikipedia.org/wiki/Standard_streams
Anyone know how I can enter a multiline value in an Ant script? I'm prompting the user for a Subversion commit comment using the input task, and I'd like to be able to support multiple lines of text.
I'm running the standalone version of Ant at the Windows command prompt.
I thought I might be able to do a search and replace for \n, but I can't see any easy way to do a replace from property value to property value in Ant. It looks like I'd have to write a file, replace in the file, and then load the file into another property. I don't want it that badly.
I'm not 100% positive about this, but I took a look at the Ant source code, and it just does a readLine():
From /org/apache/tools/ant/input/DefaultInputHandler.java:
/**
* Prompts and requests input. May loop until a valid input has
* been entered.
* #param request the request to handle
* #throws BuildException if not possible to read from console
*/
public void handleInput(InputRequest request) throws BuildException {
String prompt = getPrompt(request);
BufferedReader r = null;
try {
r = new BufferedReader(new InputStreamReader(getInputStream()));
do {
System.err.println(prompt);
System.err.flush();
try {
String input = r.readLine();
request.setInput(input);
} catch (IOException e) {
throw new BuildException("Failed to read input from"
+ " Console.", e);
}
} while (!request.isInputValid());
} finally {
if (r != null) {
try {
r.close();
} catch (IOException e) {
throw new BuildException("Failed to close input.", e);
}
}
}
}
Here is what I would do if I were you:
If you are using Ant 1.7, then try implementing your own InputHandler, as described in the documentation. The Apache License permits you to basically copy-and-paste the above code as a starting point.
If you are using Ant 1.6 or earlier, then just create your own MultiLineInput task. You can extend the existing Input class and just read multiple lines.
In either case, you would need to decide how the user indicates "I'm done." You could use a blank line or a period or something.
Good luck!
P.S. When I did a Google search for "ant multi-line input", this page was the first hit :-). Pretty impressive for a question that was asked less than an hour ago.