Call function of DLL at testcomplete

[nikki85]

Hi Buddy ,

i failed to call function of DLL which is developed in C++

the function of DLL in C++ as below

#include "stdafx.h"
 int add(int a, int b)
{
  return a + b;

}

my script at testcomplete is as below

sub test
dim a
set Def_Dll=DLL.DefineDLL("test_dll")

Call Def_DLL.DefineProc("addA",vt_i4,vt_i4,vt_i4)
Call Def_DLL.DefineAlias("add", "addA")
                   
set Lib=Dll.Load("C:\Users\H208139\Desktop\test_dll\Debug\test_dll.dll","test_dll")

a=Lib.add(1,2)
log.Message(a)

end sub

test result :Object doesn't support this property or method: 'Lib.add'

[nikki85]

add attchment

[tristaanogre]

I'm not 100% certain.... but you are defining the procedure/method and giving it an Alias of addA.  The DefineProc should be using the method name as it is called in the DLL....  So, with that, shouldn't your code be...

sub test 
dim a
set Def_Dll=DLL.DefineDLL("test_dll")

Call Def_DLL.DefineProc("add",vt_i4,vt_i4,vt_i4)
Call Def_DLL.DefineAlias("addA", "add")
                    
set Lib=Dll.Load("C:\Users\H208139\Desktop\test_dll\Debug\test_dll.dll","test_dll")

a=Lib.addA(1,2)
log.Message(a)

end sub

[AlexKaras]

Hi,

Check that your DLL meets requirements from https://support.smartbear.com/testcomplete/docs/testing-with/advanced/using-external-functions/calli....

Especially those:

-- Only standalone exported routines can be called from TestComplete tests. There is no way to call methods of exported classes.

-- The DLL routine to be called must match the stdcall calling convention.

Also check the bitness of TestComplete and DLL (https://support.smartbear.com/testcomplete/docs/testing-with/advanced/using-external-functions/calli...).

[TanyaYatskovska]

@nikki85, did you find an answer to your question? Please, share your solution with us.

[nikki85]

hi  TanyaGorbunova

still no solution

[TanyaYatskovska]

Have you tried suggestions given here? What exactly doesn't work when applying them?

[nikki85]

yes , I  tried suggestions given here, error message is still object doesn't support this property or method: 'Lib.add'

[TanyaYatskovska]

---

I don't see the stdcall calling convention in your original dll as Alex mentioned:

@AlexKaras wrote:

The DLL routine to be called must match the stdcall calling convention.

---

At the same time, this is one of the requirements.

I'm not familiar with C++ very well - I suppose you should declare the add routine something like this:

 int __stdcall add(int a, int b) 
{
	 return a + b;
}

If you modified the dll, it's worth posting the new one, as well as the updated code.

[nikki85]

Hi TanyaGorbunova,

Thanks for your reply

I add the __stdcall at dll ,but the error message is the same : Object doesn't support this property or method: 'Lib.AddA'

My scripts in VBscript as below :
sub test
dim a
Set Def_Environment = DLL.DefineEnvironment(True)
Set Def_DLL = Def_Environment.DefineDLL("test_dll")
set Lib=Def_Environment.Load("C:\Users\H208139\Desktop\test_dll\Debug\test_dll.dll","test_dll")
Call Def_DLL.DefineProc("AddA",vt_int,vt_int,vt_int)
a=Lib.AddA(2,2)
log.Message(a)
end sub

And I attached the modified dll