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

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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dani333
Asked:
dani333
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1 Solution
 
dani333Author Commented:
I forgot to tell that it should be in C++ windows XP environment.

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AndyAinscowCommented:
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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AndyAinscowCommented:
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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dani333Author Commented:
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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AndyAinscowCommented:
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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AndyAinscowCommented:
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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dani333Author Commented:
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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AndyAinscowCommented:
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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