64 bit DLL from 32 bit process

blh83 · 26th January 2011, 20:10

Does anyone know a work-around for calling a 64 bit dll from an NSIS installer file (since the installer-generated executable is 32-bit, you can't directly call a 64 bit dll without doing a Thunking layer). I have a tight deadline coming up and would like to avoid writing a Thunking layer in the DLL. Also, I can't compile the dll in 32-bit mode because the SDK that I am calling functions from is compiled only in 64-bit mode.

Basically, the end goal is to be able to run this from my script:

System::Call "myDll::FindBindings()i.r0"

where myDll is a 64-bit dll. I am happy to clarify as needed. Thanks in advance for any input.

Afrow UK · 26th January 2011, 20:29

My way around it is to use a console application instead which takes arguments and outputs the result. You can use ExecDos::exec /TOSTACK which is preferable to nsExec::ExecToStack because it pushes each new-line-separated item to the stack rather than all in one.

Stu

blh83 · 26th January 2011, 22:28

Thanks Afrow, that was another thought I had. That is likely what I will do for now, I was just hoping there was another way around it. Thanks again.

26th January 2011, 20:10	#1
blh83 Junior Member Join Date: Aug 2010 Posts: 29	64 bit DLL from 32 bit process Does anyone know a work-around for calling a 64 bit dll from an NSIS installer file (since the installer-generated executable is 32-bit, you can't directly call a 64 bit dll without doing a Thunking layer). I have a tight deadline coming up and would like to avoid writing a Thunking layer in the DLL. Also, I can't compile the dll in 32-bit mode because the SDK that I am calling functions from is compiled only in 64-bit mode. Basically, the end goal is to be able to run this from my script: System::Call "myDll::FindBindings()i.r0" where myDll is a 64-bit dll. I am happy to clarify as needed. Thanks in advance for any input.

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26th January 2011, 20:29	#2
Afrow UK Moderator Join Date: Nov 2002 Location: Surrey, England Posts: 8,434	My way around it is to use a console application instead which takes arguments and outputs the result. You can use ExecDos::exec /TOSTACK which is preferable to nsExec::ExecToStack because it pushes each new-line-separated item to the stack rather than all in one. Stu

26th January 2011, 22:28	#3
blh83 Junior Member Join Date: Aug 2010 Posts: 29	Thanks Afrow, that was another thought I had. That is likely what I will do for now, I was just hoping there was another way around it. Thanks again.