64-bit library project with 32-bit application

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Dear Friends

My Main application is 32-bit application. It is limitation due to some third party DLLs that I can't convert it to 64-bit.
Now I have created a new 64-bit library project and compilation is successful but on application startup it gives error.

What I have tried:

Trying to Run but failed.
Error: Could not load file or Assembly My64Project Version=1.0.0.0, culture=neutral, publicToken=null or one of its dependencies. An Attempt was made to load a program with an incorrect format.

Posted 17-Nov-20 22:37pm

DoingWork

Updated 18-Nov-20 3:35am

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TheRealSteveJudge · Accepted Answer · 2020-11-17T22:59:00

Please have a look here:
Process Interoperability - Win32 apps | Microsoft Docs[^]
There it is said:

On 64-bit Windows, a 64-bit process cannot load a 32-bit dynamic-link library (DLL). Additionally, a 32-bit process cannot load a 64-bit DLL.

Switch your application to 64bit and get 64bit versions of the third party dlls
or stay at 32 bit and create a 32 bit library project.

Richard Deeming · Accepted Answer · 2020-11-17T22:58:00

Solution 1

You can't load a 64-bit library in a 32-bit process, or a 32-bit library in a 64-bit process.

Posted 17-Nov-20 22:58pm

Richard Deeming

RickZeeland · Accepted Answer · 2020-11-18T03:35:00

Solution 3

Here is a possible solution: How do I use 32-bit dll in 64-bit app?[^]
But it does not look very robust to me, another option might be to split your application in a 32 part (with all the legacy dll's) and a 64 bit part and let them communicate via named pipes or something like that.

Posted 18-Nov-20 3:35am

RickZeeland