Thread: Using C DLLs in VB

I have been trying, unsuccessfully to work with a c program from visual basic, the dll's that I need to use were written in C. I have been unable to register these dll's, is there a way to use them with Visual Basic?

damn, i've seen an article on this on the web but cant remember where it is...

make a search at www.codeguru.com it's probably around there. also, in the same site, check the discussion boards (both the vb and the vcc) the vcc board has a dll section. anyway somewhere in these 2 boards u search and u'll find the answer for sure.

null

hi again. here are some links for you, seems what you looking for...

HOWTO: Make C DLL More Accessible to VB with a Type Library
http://support.microsoft.com/support.../Q189/1/33.ASP

Creating C++ DLLs to help VB
http://www.vbsquare.com/misc/cdlls/

Visual Basic Explorer
http://www.vbexplorer.com/

Creating a DLL for VB in VC++
http://www.daly.co.uk/iconic/programs/code.html

Programming Custom Hardware in Visual Basic
http://www.boondog.com/..%5Ctutorial...5Cdlltutor.htm

Extending VB with C++
http://pub13.ezboard.com/fvisualbasicexplorerfrm36

hope it helps...

null

you do in visual basic

Private Declare Function MyFunction(ByVal a as Integer, ByVal b as Integer, ByRef c as Integer) as Integer

if you declared the function as:

int MyFunction(int a, int b, int* c);

or.

Private Declare Sub MyVoidFunction(ByVal a as Integer, b as String)

if you did

void MyVoidFunction(int a, LPCSTR b);

voids do Sub's
anything else does functions, and at the end, you put the return type

void Sub
int Integer
float I don't know, but I think it's Single
double Double
char* or LPCSTR String
DWORD Long
char Byte

but remember, most VB types are unsigned, so do something about it

adn, if you use a pointer, in VB use ByRef or leave blank, otherwise, use ByVal

Good Luck

Oskilian

http://www.programmersheaven.com/zone1/cat247/index.htm