Re: crystal report data not showing - C# Discussion Boards

13-Jun-09 9:37

I have a process, i can start, and hide working fine, but i want to read from the console program, when i runs, not after, i tried to run a timer, anbd read at the tick, but my program just crashes and when it not do, i get nothing at all.

                 startInfo= new ProcessStartInfo("cmd.exe");
                 startInfo.Arguments ="/C uus.exe "+ arg.ToString();
                 startInfo.RedirectStandardError = true;
                 startInfo.RedirectStandardOutput = true;
                 startInfo.UseShellExecute = false;
                 startInfo.CreateNoWindow = true;
                 this.timer1.Enabled=true;
                 this.listBox1.Items.Clear();
                 p= Process.Start(startInfo);
                     Application.DoEvents();

void Timer1Tick(object sender, EventArgs e)
 {
         string str="";
         str=p.StandardOutput.ReadLine();
         if(str != null)
         {
                 this.Text=str.ToString();
                 this.listBox1.Items.Add(str);
         }
         Application.DoEvents();
 }

So what do i do to solve this?

Update: I tried a solution i found now My program don't crash anymore, but it also don't recevie any data at all

                proc.StartInfo.UseShellExecute=false;
                proc.StartInfo.CreateNoWindow=true;
                proc.StartInfo.RedirectStandardOutput=true;
                proc.StartInfo.RedirectStandardError=true;
                proc.StartInfo.FileName="uus.exe";
                proc.StartInfo.Arguments=arg;
                proc.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(SortOutputHandler);
                proc.Start();
                proc.BeginOutputReadLine();

void SortOutputHandler(object o,System.Diagnostics.DataReceivedEventArgs e)
{
        string str="";
        string str2="";
        str=e.Data.ToString();
        if(str!=null && str!="")
        {
                this.listBox1.Items.Add(str.ToString());
                this.Text=str.ToString();
        }
        str2=proc.StandardOutput.ReadLine();
        if(str2!=null && str2!="")
        {
                this.lsw1.Items.Add(str2.ToString());
        }
}

The program is a process whichs take some arguments, and if no error happends run and close is self, what i'am trying to do is run the process, read how long the process is done with the task, while it does the task not after, and write it in my program

some body have a working solution?

Luc Pattyn13-Jun-09 10:12

13-Jun-09 10:12

Hi,

there are several correct ways to read data from another process' output (and/or error) stream:

1.
read all at once from a stream as in string output = p.StandardOutput.ReadToEnd();. The main drawback is this only produces anything when the process p has finished.

2.
use a separate thread which synchronously reads the output/error stream (that is two threads if both streams are required)

3.
use the DataReceived event; you should not have Read calls in the handler!

MSDN says: The event is enabled during asynchronous read operations on StandardOutput. To start asynchronous read operations, you must redirect the StandardOutput stream of a Process, add your event handler to the OutputDataReceived event, and call BeginOutputReadLine. Thereafter, the OutputDataReceived event signals each time the process writes a line to the redirected StandardOutput stream, until the process exits or calls CancelOutputRead.

BTW: you have way too many ToString() calls in your code; it does not make sense at all to call ToString() on a string object; e.g. DataReceivedEventArgs.Data is a string all by itself.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

thomaxz.tc13-Jun-09 12:29

13-Jun-09 12:29

1. If you have read my post, you will know that solution wont work, that it reads after, not while.

2. I dont know here what you mean.

3. Ise'nt it what i have tried in the lower code? if, I get no data at all.

Luc Pattyn13-Jun-09 12:37

13-Jun-09 12:37

thomaxz.tc wrote:
Ise'nt it what i have tried in the lower code?

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

thomaxz.tc13-Jun-09 12:47

13-Jun-09 12:47

Then i not sure what you mean?

Luc Pattyn13-Jun-09 13:37

13-Jun-09 13:37

Hi,

1.
Why do you ignore the documentation, it says:
The event is enabled during asynchronous read operations on StandardOutput. To start asynchronous read operations, you must redirect the StandardOutput stream of a Process, add your event handler to the OutputDataReceived event, and call BeginOutputReadLine. Thereafter, the OutputDataReceived event signals each time the process writes a line to the redirected StandardOutput stream, until the process exits or calls CancelOutputRead.

2.
The DataReceived event executes on a ThreadPool thread, not on the main thread; so you are not allowed to touch any Control, however you could use Console.WriteLine() for debugging purposes. To touch Controls, you need the Control.InvokeRequired/Control.Invoke pattern.
BTW: Setting Control.CheckForIllegalCrossThreadCalls false is NOT the solution.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

thomaxz.tc13-Jun-09 23:32

load a lot of Images to memory

13-Jun-09 23:32

>1.
>Why do you ignore the documentation, it says:
>The event is enabled during asynchronous read operations on StandardOutput.

>To start asynchronous read operations, you must redirect the StandardOutput stream of a Process,

As in my lower code

proc.StartInfo.RedirectStandardOutput=true;

Ise'nt that an redirect?

>add your event handler to the OutputDataReceived event

proc.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(SortOutputHandler);

Ise'nt that an event handler for the OuptuDataRecevide?

>And call BeginOutputReadLine.

proc.Start();
proc.BeginOutputReadLine();

Ise'nt that a Call to BeginOutputReadLine?

>Thereafter, the OutputDataReceived event signals each time the process writes a line to the >redirected StandardOutput stream, until the process exits or calls CancelOutputRead.

I still get no data.

2.
>The DataReceived event executes on a ThreadPool thread, not on the main thread; so you are not >allowed to touch any Control, however you could use Console.WriteLine() for debugging purposes. To >touch Controls, you need the Control.InvokeRequired/Control.Invoke pattern.
>BTW: Setting Control.CheckForIllegalCrossThreadCalls false is NOT the solution.

OK? all the other time i have code treate and i wasen allowed i was getting a cross thread error, with i don't do here.

futher more have i change my code af bit, do reflect invoek

private delegate void TextAdderDelegate(string str);
		
void TextAdder(string str)
{
   if(this.lsw1.InvokeRequired==true)
   {
      Invoke(new TextAdderDelegate(TextAdder),new object[] {str});
   }
   else
   {
      this.lsw1.Items.Add(str);
   }
}
		
void SortOutputHandler(object o,System.Diagnostics.DataReceivedEventArgs e)
{
   string str="";
	
   if(e!=null)
   {
      if(e.Data!=null)
      {
         str=e.Data.ToString();
      }
   }
   TextAdder(str);
}

But I still not get any data.
And when i make a breakpoint, it only runs when the process finished.

nryk13-Jun-09 8:57

nryk

13-Jun-09 8:57

hi i want to load a lot of images to the memory.
of course every bitmap in the memory takes about 10 times more then in the file;
so (if there is no other way) i'm loading the image as a byte array:

private byte[] FileToByteArray (string path)
{
byte[] bytes = null;
using (System.IO.Stream stream = File.OpenRead(path))
{
using (System.IO.BinaryReader reader = new BinaryReader(stream))
{
bytes = reader.ReadBytes((int)reader.BaseStream.Length);
}
}
return bytes;
}

and store it into a byte array variable.
when i need the image i use:

private Image ByteArrayToImage(byte[] byteArrayIn)
{
if (byteArrayIn == null)
return null;
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
return returnImage;
}

so far so good, the problem is if the image need to be change i send it to a function and get new bitmap, now i want to save it back to byte array, so if i use:

private byte[] ImageToByteArray(System.Drawing.Image imageIn)
{
if (imageIn == null)
return null;
MemoryStream ms = new MemoryStream();
imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Png);
imageIn.Dispose();
return ms.ToArray();
}

i get a byte array that is about 10 times bigger. so how can i get a smaller byte array?

Re: load a lot of Images to memory

Luc Pattyn13-Jun-09 9:37