Question

I’m trying to open cmd.exe on a new process and pass some code to programatically eject a device; but when trying to do this all I get is:

“Error #2044: Unhandled IOErrorEvent:. text=Error #3218: Error while writing data to NativeProcess.standardInput.”

Here’s my code:

    private var NP:NativeProcess = new NativeProcess();

    private function EjectDevice():void
    {
             var RunDLL:File = new File("C:\\Windows\\System32\\cmd.exe");
             var NPI:NativeProcessStartupInfo = new NativeProcessStartupInfo();
             NPI.executable = RunDLL;
             NP.start(NPI);
             NP.addEventListener(Event.STANDARD_OUTPUT_CLOSE, CatchOutput, false, 0, true);
             NP.standardInput.writeUTFBytes("start C:\\Windows\\System32\\rundll32.exe shell32.dll,Control_RunDLL hotplug.dll");
             NP.closeInput();
    }

I also tried with writeUTF instead of writeUTFBytes, but I still get the error. Does anyone have an idea of what I’m doing wrong?.

Thanks for your time 🙂
Edward.

Answer 1

Maybe cmd.exe doesn’t handle standardInput like a normal process.

You could try passing what you want to execute as parameters to the cmd process, rather than writing to the standard input

I think

cmd.exe /C "start C:\Windows\System32\rundll32.exe shell32.dll,Control_RunDLL hotplug.dll"

is the format to pass something as a parameter to cmd to execute immediately.

This site has an example of passing process parameters using a string vector:

http://blogs.adobe.com/cantrell/archives/2009/11/demo_of_nativeprocess_apis.html