Registering Win32 COM DLL gives Error

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I have created a C++ Win32 Dll.
I have created a .def File which contains the names of the functions in Win32.Dll
As: 1Win32.cpp includes a class library file named gs.tlb
It has functions named sum, strupper
1win32.def as
LIBRARY "1WIN32"
EXPORTS
sum
strupper

When i try to register the DLL i am getting error
The module 1Win32.dll loaded but the entry-point DllRegisterServer was not found.

How to register the dll to be used at different places/environments ?
I am using COM components.

Help would be really appreciated.

Posted 7-Mar-11 10:50am

Member 4581741

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Ozer Karaagac · Answer 1 · 2011-03-07T11:17:00

Solution 1

You need to specify following functions in .def file.

DllRegisterServer PRIVATE
DllUnregisterServer PRIVATE

Or you can use __declspec( dllexport ) keyword.

These functions must be exported so that it can be found by name.

Posted 7-Mar-11 11:17am

Ozer Karaagac

Comments

Member 4581741 7-Mar-11 17:36pm

I have used __declspec(dllexport) in all the functions i used.
& have added the function name in .def.

Ozer Karaagac 7-Mar-11 17:55pm

Do you have such functions in your code?

Member 4581741 7-Mar-11 18:12pm

extern "C" __declspec(dllexport)
int _stdcall Test(char *largeFile, char *smallFile, int version)
{
//Initialize COM.
HRESULT hr = CoInitialize(NULL);

IShrinkGrowDPtr psShrinkGrowD(__uuidof(ShrinkGrowD));
long sResult = 0;

psShrinkGrowD->Shrink(_bstr_t(largeFile), _bstr_t(smallFile), version, &sResult);

// Uninitialize COM.
CoUninitialize();
return sResult;
}

Member 4581741 7-Mar-11 18:24pm

DllRegisterServer PRIVATE
DllUnregisterServer PRIVATE gives me error unresolved external symbol DllRegisterServer

Ozer Karaagac 7-Mar-11 18:46pm

Now you are using .def file right. Because you don't have those functions in your code. You need to implement those functions.

BTW, I didn't understand what you mean by previous comment.

Member 4581741 7-Mar-11 20:18pm

Ok .. so i have the function named Test in my .def file.
LIBRARY "1WIN32"
EXPORTS
Test
Now i build the application & dll is created. How can i register the dll ? Let me know.
Thanks

Ozer Karaagac 7-Mar-11 21:03pm

If you would like to know how to register using OS commands after successful build, you can type this command in the same folder, where DLL file resides in it, at command prompt.

regsvr32 yourdllname.dll

If you ask me how to implement DllRegisterServer() function, I can't know how to because I don't know anything about your project. Depending on your project, you can create necessary registry keys or you can register type library. It is up to you.

Not at all.

Member 4581741 7-Mar-11 21:07pm

I have different functions for shrinking the file, growing the file, checking the version, testng crc.
Example of shrinking function is above. Implementation is same which calls functions from my Class library.
I hope u got a bit idea about my application.

Let me know if can help me to create DLLRegisterServer function.

Thanks

Rajesh Katalkar · Answer 2 · 2011-03-07T18:31:00

Solution 2

You mentioned that your dll is a win32 dll which means that it is not a com dll
Hence your dll wont get registered
Only com dlls get registered

Posted 7-Mar-11 18:31pm

Rajesh Katalkar

Comments

Member 4581741 8-Mar-11 1:02am

After adding dll to the System32 folder, running the application gives me external component gives an exception.

Also i am initializing & Uninitializing COM
HRESULT hr = CoInitialize(NULL);

IShrinkGrowDPtr psShrinkGrowD(__uuidof(ShrinkGrowD));
long sResult = 0;

//psShrinkGrowD->Shrink(_bstr_t(largeFile), _bstr_t(smallFile), version, &sResult);

// Uninitialize COM.
CoUninitialize();

Kurt Degiorgio · Answer 3 · 2011-03-07T20:00:00

Solution 3

If it is a COM DLL then you should export DllRegisterServer and
DLLUnRegisterServer in your DEF File, from what i am seeing i believe your library is just a normal DLL an not a component. (in COM you don't need to export the functions you just call query interface which will give you an indirect pointer to that function depending on the GUID you supplied)

Good Luck!!

Regards,

K,D

Posted 7-Mar-11 20:00pm

Kurt Degiorgio

Comments

Member 4581741 8-Mar-11 8:10am

Here is my function. Could u plz let me know if anything is wrong with the function.
extern "C" __declspec(dllexport)
int _stdcall Test(char *largeFile, char *smallFile, int version)
{
//Initialize COM.
HRESULT hr = CoInitialize(NULL);

IShrinkGrowDPtr psShrinkGrowD(__uuidof(ShrinkGrowD));
long sResult = 0;

psShrinkGrowD->Shrink(_bstr_t(largeFile), _bstr_t(smallFile), version, &sResult);

// Uninitialize COM.
CoUninitialize();
return sResult;
}

I am a bit new to Win32. Also if it is a normal dll i should be able to register dll but i am unsuccessful for that.

Rajesh Katalkar 9-Mar-11 0:56am

no you cannot register a normal dll.
only com dll's can be registered

Kurt Degiorgio 9-Mar-11 5:41am

no if it is a DLL you can not register it and you cannot use it like you use a COM object , if it is a DLL all you have to do to load it is call LoadLibrary and then call GetProcAddress on the function you want to use. (you can also use the import pre processor directive depending on the library)