VB .NET DLL Is not working on Win7 64 bit

Question

0.00/5 (No votes)

See more:

Hello,

I have the following problem.

I am developping a program to program RFID Midare one cards this for use in a hotel to open the doors of the rooms.

There is a DLL used dcrf32.dll , everything seems to be working but now i have a new PC and there is Windows 7 Ultimate 64 bit instead of the 32 bit version before.

When running the program there is a error at the first line where the RFID reader is used --> BadImageFormatExeption was unhandled
When connecting the RFID reader to my old PC and open the same program there is no problem.

Is there something that i need to do extra when using Win 7 64 bit.

Thanks

Best regards

Didier

Posted 1-Jun-12 7:49am

Didier Cauberghe

Add a Solution

2 solutions

Solution 1

Did you create the assembly dcrf32.dll? If not, it seems that that assembly is compiled in 32 bits so it will not support 64 bits. Try to get that dcrf64.dll if it exists.

Posted 1-Jun-12 8:29am

luisnike19

Comments

Didier Cauberghe 1-Jun-12 14:39pm

I have received only this DLL from the manufactorer of the RFID program device.
They have told me that it works also on win 7 64 bit.
When i use a demo programm that has been added to the rfid device seems to work on the win7 64 bit with the DCRF32.dll , when i rename the dll the demo programm doesnt work.
So i think that there must be a option that is not set .
Thanks
Didier

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dave Kreskowiak · Accepted Answer · 2012-06-01T10:48:00

Chances are really good that .DLL is 32-bit only. The problem comes in your project. Your project is probably targeting a CPU Type of "AnyCPU", which means on a 32-bit machine, your code will be 32-bit. On a 64-bit machine, your code will be 64-bit.

Since you can't combine 32- and 64-bit code in the same process on Windows, you must force your project to compile 32-bit (x86) only.

Go to Project -> projectName Properties -> Compile tab -> Advances Compile Options. In the Target CPU drop down, change that to x86. Recompile your project and your good to go.