VB/WinAPI, I need help from a vb and vc++ expert

I need help from a vb and vc++ expert

Author	Message
Adheer Pa #1 / 7	I need help from a vb and vc++ expert Jonathan, When you are calling the VC++ DLL's from your program , check the declaration , the data types and ByRef / ByVal properties. You may need to change the data-types from VC DLL to VB , probably that's what is causing the problem. Regards, Adheer. Quote: > I am having trouble getting vb to call my vc++ dll. Everytime I run my > demo, > I get a GPF. The Visual C++ demo program I wrote works fine. If there is > anyone > out there who is an expert on matters concerning the use of and writing > of vc++ > dlls for vb then e-mail me and I will send you the visual c++ dll and > source > and the vb demo program and source. BTW I am using visual studio 6 to do > all this. > -- > Jonathan Wilson > http://www.--*.com/
Sat, 06 Jul 2002 03:00:00 GMT

Pieter Philippaert #2 / 7	I need help from a vb and vc++ expert Also note that Visual Basic only supports Standard Calls, so don't forget to add _stdcall to the C declaration of your function, i.e.: int _stdcall MyFunction(...) {...} Regards, Pieter Philippaerts http://kpdweb.cjb.net/ Quote: > I am having trouble getting vb to call my vc++ dll. Everytime I run my > demo, > I get a GPF. The visual c++ demo program I wrote works fine. If there is > anyone > out there who is an expert on matters concerning the use of and writing > of vc++ > dlls for vb then e-mail me and I will send you the visual c++ dll and > source > and the vb demo program and source. BTW I am using visual studio 6 to do > all this. > -- > Jonathan Wilson > http://members.xoom.com/wilsonj/
Sat, 06 Jul 2002 03:00:00 GMT

Adam Kehle #3 / 7	I need help from a vb and vc++ expert Also, make sure you pass all strings "ByVal" (see MSDN article about passing strings to DLLs) Adam Kehler Quote: > Also note that Visual Basic only supports Standard Calls, so don't forget to > add _stdcall to the C declaration of your function, i.e.: > int _stdcall MyFunction(...) > {...} > Regards, > Pieter Philippaerts > http://kpdweb.cjb.net/ > > I am having trouble getting vb to call my vc++ dll. Everytime I run my > > demo, > > I get a GPF. The visual c++ demo program I wrote works fine. If there is > > anyone > > out there who is an expert on matters concerning the use of and writing > > of vc++ > > dlls for vb then e-mail me and I will send you the visual c++ dll and > > source > > and the vb demo program and source. BTW I am using visual studio 6 to do > > all this. > > -- > > Jonathan Wilson > > http://members.xoom.com/wilsonj/
Sat, 06 Jul 2002 03:00:00 GMT

Jonathan Wilso #4 / 7	I need help from a vb and vc++ expert I am having trouble getting vb to call my vc++ dll. Everytime I run my demo, I get a GPF. The visual c++ demo program I wrote works fine. If there is anyone out there who is an expert on matters concerning the use of and writing of vc++ dlls for vb then e-mail me and I will send you the visual c++ dll and source and the vb demo program and source. BTW I am using visual studio 6 to do all this. -- Jonathan Wilson http://members.xoom.com/wilsonj/
Sun, 07 Jul 2002 03:00:00 GMT

Jonathan Wilso #5 / 7	I need help from a vb and vc++ expert Don't worry, I figured out the problem. I was allocating an array of 0 elements because the VB constant I was pasing to redim was not declared public in the bas module so therefore the program was gpfing when the dll tried to access memory it wasn't allowed to access. Quote: > Also note that Visual Basic only supports Standard Calls, so don't forget to > add _stdcall to the C declaration of your function, i.e.: > int _stdcall MyFunction(...) > {...} > Regards, > Pieter Philippaerts > http://kpdweb.cjb.net/ > > I am having trouble getting vb to call my vc++ dll. Everytime I run my > > demo, > > I get a GPF. The visual c++ demo program I wrote works fine. If there is > > anyone > > out there who is an expert on matters concerning the use of and writing > > of vc++ > > dlls for vb then e-mail me and I will send you the visual c++ dll and > > source > > and the vb demo program and source. BTW I am using visual studio 6 to do > > all this. > > -- > > Jonathan Wilson > > http://members.xoom.com/wilsonj/ -- Jonathan Wilson http://members.xoom.com/wilsonj/
Sun, 07 Jul 2002 03:00:00 GMT

Jonathan Wilso #6 / 7	I need help from a vb and vc++ expert Don't worry, I figured out the problem. I was allocating an array of 0 elements because the VB constant I was pasing to redim was not declared public in the bas module so therefore the program was gpfing when the dll tried to access memory it wasn't allowed to access. Quote: > Jonathan, > When you are calling the VC++ DLL's from your program , check the > declaration , the data types and ByRef / ByVal properties. You may need to > change the data-types from VC DLL to VB , probably that's what is causing > the problem. > Regards, > Adheer. > > I am having trouble getting vb to call my vc++ dll. Everytime I run my > > demo, > > I get a GPF. The visual c++ demo program I wrote works fine. If there is > > anyone > > out there who is an expert on matters concerning the use of and writing > > of vc++ > > dlls for vb then e-mail me and I will send you the visual c++ dll and > > source > > and the vb demo program and source. BTW I am using visual studio 6 to do > > all this. > > -- > > Jonathan Wilson > > http://members.xoom.com/wilsonj/ -- Jonathan Wilson http://members.xoom.com/wilsonj/
Sun, 07 Jul 2002 03:00:00 GMT

Jonathan Wilso #7 / 7	I need help from a vb and vc++ expert Don't worry, I figured out the problem. I was allocating an array of 0 elements because the VB constant I was pasing to redim was not declared public in the bas module so therefore the program was gpfing when the dll tried to access memory it wasn't allowed to access. Quote: > Also, make sure you pass all strings "ByVal" (see MSDN article about passing > strings to DLLs) > Adam Kehler > > Also note that Visual Basic only supports Standard Calls, so don't forget > to > > add _stdcall to the C declaration of your function, i.e.: > > int _stdcall MyFunction(...) > > {...} > > Regards, > > Pieter Philippaerts > > http://kpdweb.cjb.net/ > > > I am having trouble getting vb to call my vc++ dll. Everytime I run my > > > demo, > > > I get a GPF. The visual c++ demo program I wrote works fine. If there is > > > anyone > > > out there who is an expert on matters concerning the use of and writing > > > of vc++ > > > dlls for vb then e-mail me and I will send you the visual c++ dll and > > > source > > > and the vb demo program and source. BTW I am using visual studio 6 to do > > > all this. > > > -- > > > Jonathan Wilson > > > http://members.xoom.com/wilsonj/ -- Jonathan Wilson http://members.xoom.com/wilsonj/
Sun, 07 Jul 2002 03:00:00 GMT

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