Passing Memory Stream between C# Windows

[capri]

Hi,


I'd like to know if it's possible to pass memory stream between C# windows.


Thanks

 

[jmcilhinney]

Of course it is. A MemoryStream is an object like any other. You would pass it between forms just like you would any other object, e.g. a String.

 

[capri]

This is the code to send stream. But it doesn't really work.

using (MemoryStream ms = GetMemoryStream())
{
    int hWnd = FindWindow(null, "Receive");
    int dataSize = Convert.ToInt32(ms.Length);

    COPYDATASTRUCT cds;
    cds.dwData = 0;
    cds.lpData = Marshal.AllocCoTaskMem(dataSize);
    cds.cbData = dataSize;

    SendMessage(hWnd, WM_COPYDATA, 0, ref cds);

    Marshal.FreeCoTaskMem(cds.lpData);
}

 

[jmcilhinney]

I fail to see what that code has to do with the question you asked. Maybe you should try providing a FULL and CLEAR explanation of what you're trying to achieve.

 

[capri]

I'm trying to send memory stream of a pdf file from one c# application to another. The GetMemoryStream takes the pdf file and converts it into a memory stream. The receiving application should take the memory stream and convert it back to a pdf file.

 

[jmcilhinney]

Are you trying to pass this MemoryStream between two forms in your application, or is one of them a window in an external application?

 

[capri]

It is between two applications. Both are C# Winforms.

I get an error is at


int dataSize = Convert.ToInt32(ms.Length);


and the error is "Cannot access a closed Stream."