Pelles C forum

C language => User contributions => Topic started by: jcfuller on January 27, 2009, 03:55:41 PM

Title: c COM client example using a PowerBASIC created COM server
Post by: jcfuller on January 27, 2009, 03:55:41 PM

The c source was created and tested with Pelles 32bit c compiler. You will need to add oleauto32 and uuid libraries to the linker tabs.
I am NOT a c/c++ programmer but did find enough information to put together this example of accessing PowerBASIC COM Servers with no MFC,ATL, ABCDEFGH or whatever .....
Much of it is based on code I either found here or on the Code Project web site.
If you have ever written a com server in c or c++ I'm sure you will find the PowerBASIC Server source enlightening and maybe a bit jaw dropping on it's simpilcity.
Sources and a compiled server dll are included in the attachment.

Edit:
I forgot to mention there is no need to register the com class. Code shows loading dynamically from dll.


James C. Fuller 01-27-09

Title: Re: c COM client example using a PowerBASIC created COM server
Post by: Gerome on February 02, 2009, 02:17:09 AM

Hello James,

Quote from: jcfuller on January 27, 2009, 03:55:41 PM

The c source was created and tested with Pelles 32bit c compiler. You will need to add oleauto32 and uuid libraries to the linker tabs.
I am NOT a c/c++ programmer but did find enough information to put together this example of accessing PowerBASIC COM Servers with no MFC,ATL, ABCDEFGH or whatever .....
Much of it is based on code I either found here or on the Code Project web site.
If you have ever written a com server in c or c++ I'm sure you will find the PowerBASIC Server source enlightening and maybe a bit jaw dropping on it's simpilcity.
Sources and a compiled server dll are included in the attachment.

Edit:
I forgot to mention there is no need to register the com class. Code shows loading dynamically from dll.


James C. Fuller 01-27-09

Kinda useful!
BTW, how do you correctly call (after having registering) your DLL via Excel, Word or any VBA compatible language because the constructor + destructors are OK but the two functions/methods are impossible to call :

Example :

Code: [Select]

Sub test()
Set o = CreateObject("cTest01")
    o.Fx1 42  '//==>> error 424 (object required) ??!!
Set o = Nothing
End Sub


Title: Re: c COM client example using a PowerBASIC created COM server
Post by: jcfuller on February 02, 2009, 10:50:17 AM

Gerome,
  I replied to your pm first but will comment here also.
I don't think you can call this particular server from VB in the normal fashion as the interfaces are all IUnknown.
I do not have VB so I really don't know, but to do it the way you've shown I believe the interfaces need to
be either Dual or Automation. PowerBASIC can create these types of interfaces also. For more information you can
check http://www.powerbasic.com/support/pbforums/

James