Question

I am concatenating video files of mpg format using the ‘Copy’ command in command prompt programatically in C#. I am able to execute the command manually in the command prompt and it works perfectly.

Copy /b D:\\ccc\\out0.mpg /b + D:\\ccc\\out1.mpg /b D:\\ccc\\bMPGVideo.mpg /b

But when i execute the same command programmatically, it throws an error.

strCmdText = "/K Copy /b D:\\ccc\\out0.mpg /b + D:\\ccc\\out1.mpg /b D:\\ccc\bigMPGVideo.mpg /b";
System.Diagnostics.Process p = new System.Diagnostics.Process();            
p.StartInfo.UseShellExecute = false;
p.StartInfo.FileName = "CMD.exe";
p.StartInfo.Arguments = strCmdText;
p.StartInfo.RedirectStandardError = true;
p.Start();
MessageBox.Show(p.StandardError.ReadToEnd());

The message box shows the follwing message

The handle is invalid
The filename, directoryname or volume label is invalid
The handle is invalid
The handle is invalid

Can someone please help me with this?

Answer 1

D:\\ccc\bigMPGVideo.mpg should be D:\\ccc\\bigMPGVideo.mpg.

EDIT – as per comments:

// create target file
using (FileStream Tgt = File.Create (@"D:\ccc\bigMPGVideo.mpg") )
{
    // append out0.mpg to target
    using (FileStream Out0 = File.Open (@"D:\ccc\out0.mpg"))
    {
        Out0.CopyTo (Tgt);
    }
    // append out1.mpg to target
    using (FileStream Out1 = File.Open (@"D:\ccc\out1.mpg"))
    {
        Out1.CopyTo (Tgt);
    }
}