GetProcAddress Fail in VC++ App while using VB Dll

[JMurugesh]

I have created a VB DLL using the code given below. And then I tried to use that DLL in an VC++ Win32 application. Where the LoadLibrary/AfxLoadLibrary were working ok. But the GetProcAddress calls always returning NULL. Can anybody help?


VB Dll code:

Public Function LoadResourceInteger(ByVal theStringID As Integer) As Integer
LoadResourceInteger = 0
On Error GoTo ErrMsg
LoadResourceInteger = 1000
Exit Function
ErrMsg:
LoadResourceInteger = 0
MsgBox ("Resource:missing in MUI Resource File.") ' MUI - Multilanguage User Interface
End Function



VC++ Win32 App uses that VB DLL:


typedef int (__stdcall *LoadRessString)(int argument1);

HINSTANCE hMod;
hMod = AfxLoadLibrary("MUIResourceEnglish.dll");
if(NULL == hMod)
{
MessageBox("Object Not Created","Caption",MB_OK);
return;
}
else
{
LoadRessString localLoadResString;
localLoadResString = (LoadRessString) GetProcAddress(hMod,"LoadResourceInteger");
if(localLoadResString == NULL)
{
MessageBox("GetProcAdress Failed","Caption",MB_OK);
FreeLibrary( hMod);
return;
}
int myResString = localLoadResString(1);
MessageBox("Success","Caption",MB_OK);
return ;
}GetProcAddress(hMod,"LoadResourceInteger");
if(localLoadResString == NULL)
{
MessageBox("GetProcAdress Failed","Caption",MB_OK);
FreeLibrary( hMod);
return;
}

int myResString = localLoadResString(1);
MessageBox("Success","Caption",MB_OK);
return ;
}

Jothi Murugeswaran.S

[AHMEDYO]

HI...

ops man, visual basic 6.0 just can export COM classes it cant export function as API, just you can call class members that exported by VB6 from VC++ by using import directive or COM API functions

#import "yourCOMdll.dlll"
 

or you can use COM API functions as CoCreateInstance, CoGetobject as so on....

finally GetprocAddress is working only with Dll have API as Windows API kernel.dll and user32.dll and this type of dll VB6 cannot export but if you reverse your operaion it will work, you can create dll from VC++ that you can use from VB6 by GetProcAddress and LoadLibrary

GOOD LUCK...

[JMurugesh]

HI...

ops man, visual basic 6.0 just can export COM classes it cant export function as API, just you can call class members that exported by VB6 from VC++ by using import directive or COM API functions

#import "yourCOMdll.dlll"
 

or you can use COM API functions as CoCreateInstance, CoGetobject as so on....

finally GetprocAddress is working only with Dll have API as Windows API kernel.dll and user32.dll and this type of dll VB6 cannot export but if you reverse your operaion it will work, you can create dll from VC++ that you can use from VB6 by GetProcAddress and LoadLibrary

GOOD LUCK...

Thanks for reply
How to use the cocreateinstance?

[AHMEDYO]

HI...

COM API Functions as CoCreateInstance it not just a function call , it need more knowledge about COM Objects, this link may be help you

http://msdn2.microsoft.com/en-us/library/ms686615.aspx

Kind Regards

[JMurugesh]

HI...

COM API Functions as CoCreateInstance it not just a function call , it need more knowledge about COM Objects, this link may be help you

http://msdn2.microsoft.com/en-us/library/ms686615.aspx

Kind Regards

I need an example for that....
and also i want to make sure that , by using this method can we access the functions(without hardcoding import, idl,..) present in the activex dll created in vb?

[AHMEDYO]

HI..

ok i will get you an example in my second post, but there is no third way to do that within VC++, only Import Directive and COM API Functions can be used to create COM Objects.

Bext Regards