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VB Forum / General 2 / February 2004VB6 & VC6 C++ DLL
How do I access a DLL written in VC6 within a VB6 program? For example if I used inline assembly to write a matrix multiplication routine and compiled it as a DLL. How now do I call that routine? -- Craig. > How do I access a DLL written in VC6 within a VB6 program? > > For example if I used inline assembly to write a matrix multiplication > routine and compiled it as a DLL. How now do I call that routine? See the sections on mixed language programming in the help files for both VB and your external language of choice. There are samples of almost all types of arguments and return values in there. However, if you are specifically interested in matrix manipulations, why not simply take the Netlib code and package it rather than writing it over again? > How do I access a DLL written in VC6 within a VB6 program? > [quoted text clipped - 3 lines] > -- > Craig. Declare the procedures, the same way you would call a windows api function in a dll: Private Declare Function GetTickCount Lib "kernel32.dll" () As Long dim nTick as Long nTick = GetTickCount() On the other end, you have various tasks to do, such as making your procedures have the correct calling convention (WINAPI, aka PASCAL, I think), and exporting them correctly.... >> How do I access a DLL written in VC6 within a VB6 program? >> [quoted text clipped - 16 lines] >procedures have the correct calling convention (WINAPI, aka PASCAL, I >think), and exporting them correctly.... WINAPI is a macro for the __stdcall calling convention which is the only calling convention that VB6 recognises. This is the same convention that the Win32 API uses. The PASCAL calling convention is, I believe, for 16 bit platforms only and so not applicable. When writing the VB6 declare statments for DLL's written in C++ watch out for C++ name mangling. The name exported by your C++ compiler may not be what you think it is without some effort to make sure it becomes what you would expect. At best this may be *yourfunction@8* where the function name is followed by @ followed by the number of bytes that make up the argument list. At worst it can be prefixed by something horrible. This depends on your C++ compiler and your documentation should tell you what you need to know. Geoff Thanks guys I found an awesome code sample for this. > >> How do I access a DLL written in VC6 within a VB6 program? > >> [quoted text clipped - 32 lines] > > Geoff >Thanks guys I found an awesome code sample for this. Any chance you might post a link to it? Might be useful to others with the same query. geoff >> >> How do I access a DLL written in VC6 within a VB6 program? >> >> [quoted text clipped - 32 lines] >> >> Geoff > >Thanks guys I found an awesome code sample for this. > > Any chance you might post a link to it? Might be useful to others > with the same query. > > geoff This is a post from comp.lang.basic.visual on the same subject. While the English is not great, the programming is, which is the main thing: > Sorry, I read English a little bit, but not write. > It is pardon when it is strange English. [quoted text clipped - 19 lines] > > - bono |
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