Runtime Dynamic linking a Dll for a class defined in dll

Vivek Soni 21

Hi,

I am trying to export a class defined in dll. After following msdn example for exporting a "function" in dll, i compiled and used that code but so far i am clueless about how to export a class defined in dll.

Kindly tell me how we can export a class and use functions inside it by using runtime dynamic linking. If possible guide me to the correct web resource.

thanks...

Vivek

David Lowndes 2,535 Reputation points MVP

2024-04-15T10:54:52.0866667+00:00

I assume by "runtime dynamic linking", you're aiming to use LoadLibrary, GetProcAddress? If so, you're probably going to struggle judging by this thread.
If you just want to use implicit linking, the tooling should make it relatively easy if you follow the documentation.
Vivek Soni 21 Reputation points

2024-04-15T16:25:05.9633333+00:00

I am avoiding stackoverflow btw... but yes i am using LoadLibrary and GetProcAddress, but so far unable to compile the code with correct design with classes... I am having a class of parser, in which i will be taking a Class Object , and exporter that takes object and some function to call for functionality... all this i want to encapsulate in a dll nicely... I refered VCSamples2008 but that deals with MFC only... can you share a snippet on how to Use a class and its function with DLL...

I am trying to not include Lib file that is generated... or linking with lib is neccessory at all...
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David Lowndes 2,535 Reputation points MVP

2024-04-15T17:02:23.25+00:00

From your description of what you want, and the difficulty there will be in rolling your own, I suggest that you look instead at using a COM interface.
RLWA32 45,481 Reputation points

2024-04-15T17:17:12.6566667+00:00

And for in-process COM servers (DLLs) registration-free COM simplifies their use considerably.

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uncle_Kei 0 Reputation points

2024-04-16T01:29:27.5533333+00:00
The easiest way to use class member functions exported from the DLL from the EXE side is outlined below.

(1) Export the class in the DLL and build it.

Example) ( Test_Class.h ) class EXPORTS_CLASS TEST_CLASS{ void TestFunc(){ ::OutputDebugStringW( L "TEST_CLASS::TestFunc() is call \n")}};

(2)Copy the resulting DLL to the EXE execution environment.

(3) Refer the completed LIB to the linker of the EXE project.

(4) In EXE, #include "Test_Class.h", create an instance of TEST_CLASS, and call TestFunc() from that instance.

(5) Build the EXE.

Once the above can be done, it is a good idea to start considering how to get the class function of the DLL written in C++ language by GetProcAddress().

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Runtime Dynamic linking a Dll for a class defined in dll

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