c# threads & dragdrop

Hello! I recently tried using threads in my winForms application in c# along with a form containing a drag& drop listbox which resulted in recieving the infamous "DragDrop registration did not succeed." exception. Now, I know from what I've read on the forums that this has something to do with setting the appartment state(or something like that) but I don't know how to do that. Could you please look at the following piece of code and try to guide me through the debbuging process?

Expand|Select|Wrap|Line Numbers

 //---This is in the main program--

namespace MediaUL

{

    static class Program

    {

        /// <summary>

        /// The main entry point for the application.

        /// </summary>

        static public string plist;
 
        [STAThread]
 
        static public void pconv()

        {

            string aux, dest,aux2;

            while (true)

                if (Program.plist != null)

                {

                    int i = 0;

                    while (Program.plist[Program.plist.Length-i-1] != '.') i++;

                    aux2 = Program.plist.Substring(0, Program.plist.Length - i - 1);

                    i = 0;

                    while (aux2[aux2.Length-i-1] != '\\') i++;

                    dest = aux2.Substring(aux2.Length - i , aux2.Length - 1);

                    aux = "-i \"" + Program.plist + "\" -ar 22050 -ab 32 -f flv -s 320x240 " + dest + "up.flv";

                    Process process = new Process();

                    process.StartInfo.UseShellExecute = false;

                    process.StartInfo.RedirectStandardOutput = true;

                    process.StartInfo.RedirectStandardError = true;

                    process.StartInfo.CreateNoWindow = true;

                    process.StartInfo.FileName = "ffmpeg.exe";

                    process.StartInfo.Arguments = aux;

                    process.Start();

                    while (!process.HasExited) Thread.Sleep(20);

                    process.Dispose();

                    //process = new Process();

                    //for (i = 0; i < Program.plist.Length - 1; i++)

                    //    Program.plist[i] = Program.plist[i + 1];

                    //Program.plist.Intersect("");
 
                }

                else Thread.Sleep(20);

        }
 
        static void Main()

        {

            Application.EnableVisualStyles();

            Application.SetCompatibleTextRenderingDefault(false);

            Application.Run(new Form1());

        }

    }

}

//---Relevant code from form1(here is where I start the thread--

private void Form1_Load(object sender, EventArgs e)

        {

            Thread pThread=new Thread(new ThreadStart(Program.pconv));

            pThread.SetApartmentState(ApartmentState.STA);

            pThread.Start();

        }

Many thanks in advance.

Jul 26 '08 #1

Follow Post Reply

2086

haplo

Never mind, it seems that moving the pconv function above the [STATHREAD] directive solves the problem.

Jul 28 '08 #2

Post your reply

Similar topics