What exactly is the "Multi-threaded Debug DLL" Runtime Library option doing in VS 2008?

Posted by GregH on Stack Overflow See other posts from Stack Overflow or by GregH
Published on 2010-03-29T23:59:51Z Indexed on 2010/03/30 0:03 UTC
Read the original article Hit count: 700

Filed under:

vb.net

|

vc++.net

|

visual-studio-2008

|

dll

I have a solution in VS 2008 that creates a DLL. I then use that DLL in another application. If I go in to the DLL projects property pages and change the following configuration for a DEBUG build then the built dll no long provides the desired functionality. If I change it back and rebuild the DLL, then the DLL does provide the correct functionality:

Property Pages => Configuration Properties => C/C++ => Code Generation => Runtime Library

If set to "Multi-threaded Debug DLL (/MDd)" then everything works as it should. I get the correct functionality from the DLL

If set to "Multi-threaded DLL (/MD)" then the DLL does not function properly...no runtime errors or anything, it just doesn't work (The DLL is supposed to plot some lines on a map but does not in this mode).

So the question is, why does using the /MDd flag result in correction functionality of the underlying code, while /MD results in incorrect functionality?

A little background...somebody else developed the DLL in C++ and I am using this DLL in a VB.net application.

© Stack Overflow or respective owner

Related posts about vb.net

VB.NET How Do I skin a vb.net app

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to skin a vb.net app I made ive googled some stuff and I've seen skinned vb.net apps. However it seems like any time i try to find someone explaining it its a link to a pay for product. Does anyone have anything useful on this? >>> More
VB.NET IF() Coalesce and “Expression Expected” Error

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
I am trying to use the equivalent of the C# “??” operator in some VB.NET code that I am working in. This StackOverflow article for “Is there a VB.NET equivalent for C#'s ?? operator?” explains the VB.NET IF() statement syntax which is exactly what I am looking for... and I thought I was going to… >>> More
Would a programmer knowing C# and VB.Net ever choose VB.Net?

as seen on Programmers - Search for 'Programmers'
Now before someone tells me VB.Net isn't bad like VB was, I know it isn't. But, I've yet to speak to a programmer who is completely content that some project they work on is written in VB.Net. Basically, my question is would a programmer knowing both C# and VB.Net (and all of their team knowing both)… >>> More
Do I lose anything by coding in c# and using free online vb.net code convertors?

as seen on Programmers - Search for 'Programmers'
The company I work for uses vb.net since there are many programmers who moved up from vb6 to vb.net. Basically more vb.net resources in the company for support/maintenance vs c#. I am a c# coder and was wondering if I could just continue coding in c# and just use the many online free c# to vb.net… >>> More
What are some good/reputable/widely-used libraries written in VB.NET?

as seen on Stack Overflow - Search for 'Stack Overflow'
Generally speaking, when VB.NET and C# are compared, there is a lot of strong support for C#, accompanied by some bashing of VB.NET until a respected developer comes along and acts as The Voice Of Reason, pointing out that while VB prior to VB.NET had its fair share of issues, VB.NET is really a very… >>> More

Related posts about vc++.net

What exactly is the "Multi-threaded Debug DLL" Runtime Library option doing in VS 2008?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a solution in VS 2008 that creates a DLL. I then use that DLL in another application. If I go in to the DLL projects property pages and change the following configuration for a DEBUG build then the built dll no long provides the desired functionality. If I change it back and rebuild the… >>> More
Flash vs. Ajax Abilities

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey everyone. I want to develop an application that does a bunch of cool stuff. The first thing that I need in it is to get information about the page a person is browsing. With that said, I need for example to know how long a user stayed in a page and where was the scrollbar. While getting that… >>> More
Caption Widget mouse events

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I want to capture the left and right mouse button of caption widget how to do that? >>> More
How do I mount a drive when user clicks on a button of MFC application

as seen on Stack Overflow - Search for 'Stack Overflow'
Now I have a MFC application which accepts the user name and password and on click of connect it should mount the drive. The drivers team has already created and installed the driver which has function to mount the drive. Now the problem is when I click the login button on my MFC app then… >>> More
how to write MPEG4 video files from stream in vc++ directshow

as seen on Stack Overflow - Search for 'Stack Overflow'
hai all... Am writing simple application for capturing video from camera and save in .WMV files using vc++ Directshow.i done this task.bt i need to write file as MPEG4 file type. can anyone help me. CAMERA---->SAMPLEGRABBER---->getting streams from sample graaper.. i get stream from… >>> More