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9.0

Loading and working with DLLs

Asked by mzimmer74 in C++ Programming Language

Tags: c++

I'm attempting to write a c++ program to add a currently installed printer to the machine such that it is installed for all users. I can accomplish that in dos by using this command:
RUNDLL32 PRINTUI.DLL,PrintUIEntry /ga /c\\machine /n\\machine\printer /j"LanMan Print Services"

I've gotten a lot of the program done (I'm using visual c++ 2008 Express Edition) but am having some problems figuring out the DLL portions (my background is in Java so I'm struggling with c++). After browsing around and finding some solutions that were similar, I have the code I attached to this question.

Currently, I can load the dll into hDLL just fine. However, the call to GetProcAddress is returning null. Any idea what I'm doing wrong here? Also, once the GetProcAddress call actually works, what do I need to do to make the dwParam1 compile? I get error C2664 with a conversion problem. I'm assuming that's the correct way to call the params, but if not what would be correct for the desired DLL call?

I'm not limited to using DLL loading, so if there is another method to do this I'd be glad to hear it. However, as mentioned, I'm still learning C++ so simpler is better. :)

Thanks,
Matthew

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             typedef UINT (CALLBACK* LPFNDLLFUNC1)(DWORD,UINT); 
HINSTANCE hDLL;               // Handle to DLL
LPFNDLLFUNC1 lpfnDllFunc1;    // Function pointer
DWORD dwParam1;
UINT  uParam2, uReturnVal;
 
hDLL = LoadLibraryA("C:\\Windows\\system32\\printui.dll"); //this works
if (hDLL != NULL)
{
   lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL, "PrintUIEntry"); //this fails
   if (!lpfnDllFunc1)
   {
      FreeLibrary(hDLL);       
      return -1;
   }
   else
   {
      dwParam1="/ga /c\\machine /n\\machine\printer /j\"LanMan Print Services\""
      uReturnVal = lpfnDllFunc1(dwParam1, uParam2);
   }
   return 0;
}

           
         

20091111-EE-VQP-92 / EE_QW_2_20070628

Loading and working with DLLs

Asked by mzimmer74 in C++ Programming Language

Tags: c++

About this solution