Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

How define and update this string buffer

Posted on 2009-04-03
2
247 Views
Last Modified: 2013-12-14
Hi All,
I've created a string buffer in VB and then call a c++ MFC dll with an external function as follows. I pass the buffer through by reference. Then...
What I'm not sure about is how declare it as a parameter to the function and populate it with a value from a CString variable.

The code below doesn't work but hopefully gives you an idea of where I'm heading. It's kind of like a API. Also the return value must non-unicode.

Any suggestions will be greatly appreciated.
int __declspec(dllexport) __stdcall ReadXML(CString &MtBuffer, int length, BSTR xmlFilePath, BSTR xmlNode)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
 
	CString str_xmlFilePath = BSTR2CString(xmlFilePath);
	CString str_xmlNode = BSTR2CString(xmlNode);
	
	CString	m_xml_value;
	m_xml_value = _T("");
	std::string _label;
	
	ParamIO inXml;
	inXml.readFile(str_xmlFilePath);
	inXml.read(str_xmlNode, _label, std::string(""));
	m_xml_value = _label.c_str();
	
	MtBuffer = m_xml_value;
	return 0;
}

Open in new window

0
Comment
Question by:ill_comms
2 Comments
 
LVL 19

Accepted Solution

by:
alb66 earned 125 total points
ID: 24057765
Give alook at
"How to pass arrays and strings between Visual Basic and C functions or between Visual Basic and C++ functions by using Visual Basic 6.0"
http://support.microsoft.com/?scid=kb%3Ben-us%3B205277&x=19&y=10
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
FMX enumerated colours 2 117
eclipse compiler vs Installed JREs option 3 106
egit plugin on eclipse 8 82
draw a Christmas tree by using a nested loop? 26 77
When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Update (December 2011): Since this article was published, the things have changed for good for Android native developers. The Sequoyah Project (http://www.eclipse.org/sequoyah/) automates most of the tasks discussed in this article. You can even fin…
The viewer will learn how to synchronize PHP projects with a remote server in NetBeans IDE 8.0 for Windows.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question