Re: How to use loadlibrary function - C / C++ / MFC Discussion Boards

Re: How to use loadlibrary function

Stuart Dootson19-Mar-09 1:45

Stuart Dootson

19-Mar-09 1:45

_AnsHUMAN_ wrote:
Did you register your dll? using the regsvr32 command

You only register COM DLLs. Normal, non-COM DLLs don't need to be registered.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: How to use loadlibrary function

_AnsHUMAN_ 19-Mar-09 1:47

_AnsHUMAN_

19-Mar-09 1:47

Right! missed that out Sleepy | :zzz:

Thanks for making me recall that Smile | :)

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: How to use loadlibrary function

Code-o-mat19-Mar-09 1:31

Code-o-mat

19-Mar-09 1:31

This[^] probably answers your question.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 1:34

Ash_VCPP

19-Mar-09 1:34

i read the article but one question comes is:
i tried this way but its not working...where i should keep my dll any specific location like system32?

Thanks A Ton
Ash_VCPP

Re: How to use loadlibrary function

Code-o-mat19-Mar-09 1:46

Code-o-mat

19-Mar-09 1:46

Will your DLL be used by other programs/processes or only by one application? If only by your own app, then i'd say, keep it next to your executable. Otherwise put it into the system directory, but avoid hardcoding paths, don't assume for example that the system directory is in c:\windows\system32, because what if the user installs his Os on -let's say- drive E, then the system folder should sit in e:\windows\system32.
You usually only need to register a DLL if it needs to do things like add registry entries or such before it can be used, so basicly, if your DLL needs registering or not depends on your DLL.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: How to use loadlibrary function

Stuart Dootson19-Mar-09 1:48

Stuart Dootson

19-Mar-09 1:48

Is it a system DLL? If it is, it really ought to live in a Windows system directory.

If it isn't, just put it in the same directory as your executable. The page that Code-o-mat pointed you at says that the first place the system looks for DLLs is "The directory from which the application loaded".

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 2:16

Ash_VCPP

19-Mar-09 2:16

i tried by putting it at every possible place but its not working....is there any other way to import type library coz i imported it using static path??

Thanks A Ton
Ash_VCPP

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 2:21

Cedric Moonen

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++

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 2:48

Ash_VCPP

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

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 3:00

Cedric Moonen

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++

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 3:10

Ash_VCPP

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

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 3:14

Cedric Moonen

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++

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 3:22

Ash_VCPP

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

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 3:29

Cedric Moonen

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++

Re: How to use loadlibrary function

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

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: How to use loadlibrary function

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:

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 3:20

Ash_VCPP

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

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 3:32

Cedric Moonen

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++

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 3:49

Ash_VCPP

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

Re: How to use loadlibrary function

led mike19-Mar-09 4:27

led mike

19-Mar-09 4:27

No chance. George has that one locked down.

Re: How to use loadlibrary function

Cedric Moonen19-Mar-09 4:39

Cedric Moonen

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++

Re: How to use loadlibrary function

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 | :((

Re: How to use loadlibrary function

#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)

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
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Re: How to use loadlibrary function

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

Re: How to use loadlibrary function

Ash_VCPP19-Mar-09 4:08

Ash_VCPP

19-Mar-09 4:08

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

Thanks A Ton
Ash_VCPP

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