Visual Basic, Passing arrays from VB to a DLL written in VC++

Passing arrays from VB to a DLL written in VC++

Author	Message
Jolly Rog #1 / 3	Passing arrays from VB to a DLL written in VC++ I have a problem with VB:s arrays. I haven't been able to figure out how they work in terms of pointers and so on. I'm writing a DLL in VisualC++ 5.0 that I'm calling from VisualBasic 5.0. After messing a bit I found out that strings come as char to C++, but I can't get the arrays to work. I've been trying to catch a byte array as char, char* and an integer array as short* and short**. These all give totally messed up values though (and the single pointer variants leaving me with a page fault....). Does anyone know how it works? Thanks, Erik
Mon, 09 Jul 2001 03:00:00 GMT

Bri #2 / 3	Passing arrays from VB to a DLL written in VC++ What does you call from VB look like ? I've done this with a long array and it works fine . Make sure you are not you aren't passing the array by Val in your VB dll declaration . I can send you some sample code that I tested with VB 6 and C++ 6 if you still need it . (email me) Good Luck ,Bri Quote: >I have a problem with VB:s arrays. I haven't been able to figure out >how they work in terms of pointers and so on. I'm writing a DLL in >VisualC++ 5.0 that I'm calling from VisualBasic 5.0. > After messing a bit I found out that strings come as char to C++, >but I can't get the arrays to work. I've been trying to catch a byte >array as char, char* and an integer array as short* and short**. >These all give totally messed up values though (and the single pointer >variants leaving me with a page fault....). >Does anyone know how it works? >Thanks, > Erik
Mon, 09 Jul 2001 03:00:00 GMT

Mick O'Neil #3 / 3	Passing arrays from VB to a DLL written in VC++ When passing the array from VB, it should be passes as the 1st element ByRef. Your C module can then pick it up as a char* ie: Declare Sub Something(ByRef ArryPointer as Any) . . Call Somethin(MyByteArray(0)) Regards, Mick. http://members.aol.com/midipapa/MONeill.htm Quote: >I have a problem with VB:s arrays. I haven't been able to figure out >how they work in terms of pointers and so on. I'm writing a DLL in >VisualC++ 5.0 that I'm calling from VisualBasic 5.0. > After messing a bit I found out that strings come as char to C++, >but I can't get the arrays to work. I've been trying to catch a byte >array as char, char* and an integer array as short* and short**. >These all give totally messed up values though (and the single pointer >variants leaving me with a page fault....). >Does anyone know how it works? >Thanks, > Erik
Tue, 10 Jul 2001 03:00:00 GMT

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