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How to avoid loading 3rd party DLL?

Posted on 2002-03-15
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Last Modified: 2010-04-01
I program in Visual C++ version 6 on Windows NT 4.  A third party provides a DLL, a link-time library to go with that DLL, and a header file.  Whenever I link my program to the 3rd party library, my program will demand the presence of the DLL at startup, regardless of whether or not my program actually reaches any function calls to the 3rd party library.  I want to avoid installing the DLL in all the computers around the world that run my software.  I want to limit distribution of the DLL just to those computers that need its functionality.  I do not have the source code for the DLL or the 3rd party link-time library, and the 3rd party has so far been uncooperative in helping me achieve my goal.  Do I have any way out?

Thanks,
     - David
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Question by:dwhite494
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jkr earned 200 total points
ID: 6869506
>>Do I have any way out?

Yes - use the "/delayload" liker option, e.g.

/delayload:3rdparty.dll
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by:jkr
ID: 6869515
BTW, to elaborate: This option will cause the DLL to be loaded only when it is needed, i.e. the 1st time a function of the DLL is being called. Just add the above statement to your linker options for your project.

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by:allym
ID: 6869559
Another way is not to link with their .lib file, but pull in the DLL with the LoadModule() API call and then get the address of the function(s) you use with GetProcAddress().
However, the linker option is much easier to use as you won't have to modify your code.
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Author Comment

by:dwhite494
ID: 6869858
Mr./Ms. "JKR" continues:
BTW, to elaborate: This option will cause the DLL to be loaded only when it is needed, i.e. the 1st
time a function of the DLL is being called. Just add the above statement to your linker options for
your project.
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by:jkr
ID: 6870219
"Mr." is OK :o)
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