How do I declare a string and pass it from a Visual Basic GUI to a C++ DLL?

complete · Jan 14, 2006, 11:46 PM

How do I declare a string and pass it from a Visual Basic GUI to a C++ DLL?

Now I am debugging successfully. I can debug either on the Visual Basic end
or I can debug on the C++ side by using the DLL's project file and declaring
the compiled VB code as the launching executable. I have narrowed the problem
down to the way that I am declaring and passiing the string variables.

pr0digal jenius · Jan 15, 2006, 07:25 AM

oooh.

I really have no idea...it SOUNDS like something you'll have to use a wrapper on to pass, although you mihgt can get away with doing some sort of conversion upon reading it instead.

And while this is a horrible answer, you may have some luck trying visual C# as well, as it has all the gui aspects of VB, and has similar power to C++

logos1 · Jan 16, 2006, 05:58 AM

this is one of the main issues that microsoft has attempted to solve with their .net framework.

the other way is to use symbol resolution and binding to a type that's recognizable by both ends. declare a char array and export it as a public symbol in your dll, and use whatever vb's equivalent to __declspec(dllimport) is to import it into your application.

dehx · Mar 22, 2006, 07:54 PM

It would help if you told us what version of C++ and VB you are using.

Jan 14, 2006, 11:46 PM	#1
complete HardwareHeaven Newbie Join Date: Aug 2005 Posts: 10 Rep Power: 0	How do I declare a string and pass it from a Visual Basic GUI to a C++ DLL? How do I declare a string and pass it from a Visual Basic GUI to a C++ DLL? Now I am debugging successfully. I can debug either on the Visual Basic end or I can debug on the C++ side by using the DLL's project file and declaring the compiled VB code as the launching executable. I have narrowed the problem down to the way that I am declaring and passiing the string variables.

Jan 15, 2006, 07:25 AM	#2
pr0digal jenius Delete Me Join Date: Mar 2004 Posts: 14,648 Rep Power: 0	oooh. I really have no idea...it SOUNDS like something you'll have to use a wrapper on to pass, although you mihgt can get away with doing some sort of conversion upon reading it instead. And while this is a horrible answer, you may have some luck trying visual C# as well, as it has all the gui aspects of VB, and has similar power to C++

Jan 16, 2006, 05:58 AM	#3
logos1 DriverHeaven Newbie Join Date: Feb 2005 Posts: 14 Rep Power: 0	this is one of the main issues that microsoft has attempted to solve with their .net framework. the other way is to use symbol resolution and binding to a type that's recognizable by both ends. declare a char array and export it as a public symbol in your dll, and use whatever vb's equivalent to __declspec(dllimport) is to import it into your application.

Mar 22, 2006, 07:54 PM	#4
dehx DriverHeaven Junior Member Join Date: Mar 2006 Posts: 30 Rep Power: 0	It would help if you told us what version of C++ and VB you are using.