Is it possible in Windows 7 64 bit to use 64 bit com dlls (in process servers) from a 32 bit exe application?

Question

I need to leave my VB6 gui application as 32 bit running on a windows 7 system but it has calls to com dlls (in process servers) and com exe's ( out of process servers).

My understanding is that it should have no problem with the com exe's the out of process servers.

I think the com dll in process server may have trouble since it is 64 bit but the application calling it is 32 bit.

Has anyone used a 64 bit com dll from a 32 bit application?

Thanks

score 2 · Answer 1 · edited May 23 '17 at 10:34

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A solution to this is discussed here:

https://stackoverflow.com/a/8484244/147637 (Read the whole post)

edited May 23 '17 at 10:34

Community

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answered Dec 13 '11 at 18:43

Jonesome Reinstate Monica

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score 0 · Answer 2 · answered May 25 '11 at 15:05

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Years ago I used a 32bit DLL in a 16bit app. I don't remember how we did it (and the technique would surely not still be applicable), but this is generally called "thunking".

A quick Google would appear to indicate this can't be done in process, but I only scanned: http://www.google.com/search?q=thunking+64bit+32bit+dll

answered May 25 '11 at 15:05

DougN

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I was really wondering if a COM dll which has an ipc interface layer could get around the issues stated in your links for regular dll's. – ERN May 26 '11 at 18:48

Is it possible in Windows 7 64 bit to use 64 bit com dlls (in process servers) from a 32 bit exe application?

2 Answers2