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Hi ,
 
I have an unmanaged DLL (c++)...How can i make use of it in my c# windows application....
 
Thanks in advance
Darshan
Posted 15-Nov-12 0:41am

1 solution

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Solution 1

You need to use Platform Invoke: http://msdn.microsoft.com/en-us/library/26thfadc.aspx[^]
 
It's easier than it sounds (depending on the parameters you need to hand over) - at a minimum, it's just a case of adding an attribute to a method declaration:
[DllIport("User32")]
private static extern int SetForegroundWindow(IntPtr hwnd);
Uses the method SetForegroundWindow from the system DLL file "User32.dll"
You can then just call it in C#:
 
public static void SingleInstance(this Process thisProcess)
    {
    foreach (Process proc in Process.GetProcessesByName(thisProcess.ProcessName))
        {
        if (proc.Id != thisProcess.Id)
            {
            ShowWindow(proc.MainWindowHandle, SW_RESTORE);
            SetForegroundWindow(proc.MainWindowHandle);
            thisProcess.Kill();
            }
        }
    }
 
[edit]Typo: SetForgrondWindow for SetForegroundWindow - OriginalGriff[/edit]
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Comments
darshan559 at 23-Nov-12 10:26am
   
@OriginalGriff :thanku for ur answer...i got d idea and i tried with simple example and it worked great :) but the problem now is i ve to pass a structure type argument from c# application to unmanaged DLL... how can i achieve this ??
OriginalGriff at 23-Nov-12 11:32am
   
Time to start reading! (I can't give specific advice on a general subject - the MSDN link covers it pretty well)
http://msdn.microsoft.com/en-us/library/awbckfbz.aspx

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