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Creating a dll program that will be activate from a client as a separate Thread

Posted on 2004-09-10
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Last Modified: 2013-11-20
Hi,

I need to create a dll program ("hello world" for example).
the program will be activate from a MFC Client that will call this dll program as it was
a separate Thread.
How can i make a dll program and how can i make it to be as a separate thread?

Thanks , i need it extremely urgent.

Dani
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Question by:dani333
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Author Comment

by:dani333
ID: 12025282
I forgot to tell that it should be in C++ windows XP environment.

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Expert Comment

by:AndyAinscow
ID: 12025385
This might not be suitable but why not just have the 'separate thread' as another program.  You can use CreateProcess or ShellExecute to start it from your first app programatically.

I say this because it is not easy having a window (modeless) being handled from a dll (keyboard support can disappear from your app if you don't code the support).

If the other thread has a modal dialog then just call an exported function from the dll which will start the dialog but then why does it need to be in another thread?
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Accepted Solution

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AndyAinscow earned 300 total points
ID: 12025399
I have just done a quick search here and found this.  It may be worth looking at

http://www.experts-exchange.com/Programming/Programming_Languages/MFC/Q_20177543.html?query=&clearTAFilter=true
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Author Comment

by:dani333
ID: 12025711
I'm confuse, let me explain to u what i have now.

I created a client dialog based from which i choose a file to read, than i need to make some
calculation on the data from that file in another dll program, the dll program with the calculation
should be activate as a thread from my client.
I also created a dll App with  the calculation function.
Now i need to call the calculation function as a thread from my client and also show
a progress bar of the calculation progressing.
I insert the dll lib to my client recourse.

What should i do now,in order to set it up to work?

Thanks ,
Idan.
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LVL 44

Expert Comment

by:AndyAinscow
ID: 12025854
Create a worker thread to do the reading and processing.
That thread can post messages to your main app which handles the details of showing/updating the progress.
You do not actually require a separate dll to wrap the thread.
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Expert Comment

by:AndyAinscow
ID: 12025907
Look at CWinThread in help and also search on 'worker thread'.

This could be a good start - the logic is similar to what you describe as your requirement.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample/html/_sample_mfc_MTRECALC.asp
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Author Comment

by:dani333
ID: 12029929
Hi again,
I'm trying to use a function from my dll,i mus use a dll.
I have a class in my dll App:
__declspec(dllexport) class MyDllClass: public CDialog
{
...
}
and a function in that class:
__declspec(dllexport) int MyDllFunction(void *,void *);

in my client i'm using:
__declspec(dllimport) class MyDllClass;
__declspec(dllimport) int MyDllFunction(void *,void *);
At the top of my header file.

I'm tring to use this function before even creating a thread and i'm getting this error:
void CClientDlg::OnOK()
{
   void * a,*b;
   MyDllFunction(a,b);
}
error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl MyDllFunction(void *,void *)" (__imp_?XYZCompare@@YAHPAX0@Z)

What is the problem?
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Expert Comment

by:AndyAinscow
ID: 12030113
Just export what needs to be exported.
Do you need the class exporting?  (If you do then use an extension dll and AFX_EXT_CLASS  not a regular dll).
You might need to modify the .def file of the dll and have the function you export declared there.
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