Calling a DLL fonction

[Alain Royer]

I have a DLL program in C with visual c++ 5. In my DLL I have this fonction:

extern "C" __declspec(dllexport)
int EQeau(const char *szPath)
{
KEQeau EQeau;

return EQeau.Do(szPath);
}

How can I call it in visual basic.

Thanks.

[askus]

Public Declare Function <FunctionName> & Lib "<your Dll name written in c " (<your dll's parameter if any>)

make a project reference to the C DLL and then declare the above in ur global module and then create a new instance for the referenced dll for eg

set myvbdll = new <your CDLL > which is set as reference in project module

and then call the funcion like this

MYCDLL.<Your Function Name>

if u have any problem with this mail me ur c function i will do it for u.


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[Vinayak Sapre]

1) You can convert your ".h" file as idl.
2) Compile it into a type library using midl compiler. eg. midl mydll.idl
3) Reference that type library in VB using Project References Browse button.

Note that your DLL need NOT be COM DLL.

Sample code for idl is (change GUIDS for every DLL)



[
uuid(15D4AF61-78EC-11d3-B183-204C4F4F5020),
helpstring("My DLL Library"),
lcid (0x00000000),
version(1.0)
]
library MyDLLLib
{
importlib("stdole2.tlb");

[
helpstring("Declaration of functions from My DLL."),
dllname("MyDLL.DLL")
]
module MyDLLExports
{
// your declarations
[
entry("EQeau"),
helpstring("This function does lot of work.")
]
int EQeau(const char *szPath);

// other declarations of the same dll


}
}