How To Export Functions Present in a ActiveX Dll

[JMurugesh]

How To Export Functions Present in a ActiveX Dll?

So that i can use that vb dlll from any application.........

[QVeen72]

Hi,

You cannot Export Functions, It is embedded/hidden in the DLL.
Add that .dll Reference to your VB Project.
Declare Variables of the .dll objects. and use the Functions..


Regards
Veena

[AHMEDYO]

hi

VC++ only can do that, u can create dll and use it as windows API, in VB6 u just can create COM Classes, but u can create new class and set instancing property to GlobalMultiuse and then add this dll to ur project rerefnce and call function direct as visual basic standard libraries

[JMurugesh]

hi

VC++ only can do that, u can create dll and use it as windows API, in VB6 u just can create COM Classes, but u can create new class and set instancing property to GlobalMultiuse and then add this dll to ur project rerefnce and call function direct as visual basic standard libraries

Hi
I am accepting , but once if i create a dll using vc++6.0 with export options...
Can i use that dll dynamically in vb6.0? If so tell me how it can be done?

waiting for reply...

[JMurugesh]

Hi,

You cannot Export Functions, It is embedded/hidden in the DLL.
Add that .dll Reference to your VB Project.
Declare Variables of the .dll objects. and use the Functions..


Regards
Veena

Hi
I want to use that dll dynamically..
Is there any functions similar to CreateObject(used in creating object for activex dll) . For me the dll is Win32 dll.........

[debasisdas]

Yes DLL files compiled in most of the languages can be called from any other languages.

[AHMEDYO]

look man u have two types of Dlls, COM and u can use it by CreateObject method and the other type just u can imagine it as External Module have public function as Windows API, this type u cant export from VB6, if u can work with VC++ its simple to do that , by Declare ur functions with __declspec(dllexport) keywords and then declare this function then in ur vb6 project

example VC++ Dll File Name "MyDll.dll"

DWORD __declspec(dllexport) TestFunction(LPSTR Data);

then in VB6

Declare Function TestFunction lib "MyDll.dll" (byval Str as String)as Long

Private sub Form_Load()
Dim x as long
x=TestFunction("Text")
End Sub

and u can use another way and ignore that u declare it as above

u can use dll with ur code by LoadLibrary() & GetProcAddress API Functions but it will let u to work more to call any function and u will care about stack

[JMurugesh]

Declare Function TestFunction lib "MyDll.dll" (byval Str as String)as Long

The method above is static linking , but i need to link dynamically...

It can be done through LoadLibrary and GetProcAddres and some memory related API such as CopyMemory, Heap...

But What i want to know is... Is there any other easy method available in VB6 to do this work?

[AHMEDYO]

Declare Function TestFunction lib "MyDll.dll" (byval Str as String)as Long

The method above is static linking , but i need to link dynamically...

It can be done through LoadLibrary and GetProcAddres and some memory related API such as CopyMemory, Heap...

But What i want to know is... Is there any other easy method available in VB6 to do this work?

Hi..

i think there is no other way from VB to do that , and i think only visual C++ support simple method than visual basic because you can define functions take list of arguments with VC++ with "typedef" keyword & ... 3 dots to define arguments list, you can use API call only as LoadLibrary and GetProcAddress & "CallWindowsproc" from VB to call your dll functions

but visual basic have one thing that you can care about, CallByName Function

CallByName(Object as Object,Procname as String,Calltype as VbCallType,Args() as Variant)

but you must call function from object variable, you must define your functions within COM Class, thats mean you will static link your Dll or you can use createobject() function to dynamically create your object and dynamically call object functions by CallByName

Good Luck

[JMurugesh]

Hi..

i think there is no other way from VB to do that , and i think only visual C++ support simple method than visual basic because you can define functions take list of arguments with VC++ with "typedef" keyword & ... 3 dots to define arguments list, you can use API call only as LoadLibrary and GetProcAddress & "CallWindowsproc" from VB to call your dll functions

but visual basic have one thing that you can care about, CallByName Function

CallByName(Object as Object,Procname as String,Calltype as VbCallType,Args() as Variant)

but you must call function from object variable, you must define your functions within COM Class, thats mean you will static link your Dll or you can use createobject() function to dynamically create your object and dynamically call object functions by CallByName

Good Luck

Understand my problem clearly... I am having several application both in vb and vc... and i want to use a single dll which will get shared by all applications both vb and vc........

[AHMEDYO]

Understand my problem clearly... I am having several application both in vb and vc... and i want to use a single dll which will get shared by all applications both vb and vc........

i understand your problem man, if you will create COM class you can call your function dynamically from VB by CallByName and you can call it dynamically too from VC++ by allocation your function address from function address pointers table using COM API functions, but its not just one function call as VB CallByname function

this link will help you with VC++

http://msdn2.microsoft.com/en-us/library/ms680586.aspx

[JMurugesh]

i understand your problem man, if you will create COM class you can call your function dynamically from VB by CallByName and you can call it dynamically too from VC++ by allocation your function address from function address pointers table using COM API functions, but its not just one function call as VB CallByname function

this link will help you with VC++

http://msdn2.microsoft.com/en-us/library/ms680586.aspx

Do you have any samples? If so tell me... Thanks in Advance..

[JMurugesh]

Can we use CoGetClassObject to create the Object for activeX dll.

[JMurugesh]

Hi,

You cannot Export Functions, It is embedded/hidden in the DLL.
Add that .dll Reference to your VB Project.
Declare Variables of the .dll objects. and use the Functions..


Regards
Veena

Can we use CoGetClassObject to get the object of the class?

[QVeen72]

Hi,

After adding that dll in your new VB Project,
Use "Object Browser" to view all the Properties/Classes /Procedures of that dll..

Regards
Veena

[JMurugesh]

Hi,

After adding that dll in your new VB Project,
Use "Object Browser" to view all the Properties/Classes /Procedures of that dll..

Regards
Veena

Hi
I need to use that dll dynamically...
ie , by using LoadLibrary or by using CoGetClassObject.... Do you know how to use this functions in order to use the functions present in the VB ActiveXDll

Thanks in advance........

[QVeen72]

Hi,

Include the dll in your project.

To Declare the Class :
Dim TObj As New OldDLLName.ClassName

To Call a Function or Procedure in that dll:
TObj.ProcName

Once you decalre that Class, you will get "IntelliSense" Immediately after typing "TObj."

Regards
Veena