C / C++ / MFC

Load MFC regular DLL failed

28-Jan-10 20:28

You may have to install VC++ 2008 re-distributables in that machine. http://www.microsoft.com/downloads/details.aspx?FamilyID=9B2DA534-3E03-4391-8A4D-074B9F2BC1BF&displaylang=en[^]

machengzhi28-Jan-10 19:16

28-Jan-10 19:16

I have a third-party DLL,which is a regular MFC DLL. When I use LoadLibrary to load it， the handle returned always is NULL.I use dependecy to parser it, which report MSVCR80D.dll and MSJAVA.dll not find. How to resolve this problem.

KingsGambit28-Jan-10 19:23

28-Jan-10 19:23

Is it failing in your development machine? MSVCR80D.dll is a debug version DLL.

machengzhi28-Jan-10 19:29

28-Jan-10 19:29

Yes. I use debug version DLL in my debug enviroment.I debug my code and found LoadLibrary always return NULL. I use the same compiler as the DLL.

KingsGambit28-Jan-10 19:34

28-Jan-10 19:34

Can you try GetLastError() to see the cause of failure?

machengzhi28-Jan-10 19:38

28-Jan-10 19:38

I have use try-catch to catch exception, but no exception throw.

KingsGambit28-Jan-10 19:41

28-Jan-10 19:41

You can include following code after your LoadLibrary() call to get the error code:

DWORD dwErr = GetLastError();

And check the dwErr value in Visual Studio Error Lookup tool which is available under 'Tools' menu.

machengzhi28-Jan-10 19:55

28-Jan-10 19:55

I try it. error no is 126, error openning file.

KingsGambit28-Jan-10 20:01

28-Jan-10 20:01

It seems as you figured out, the depending DLL is missing. Can you check if everything works fine on Release version?

KingsGambit28-Jan-10 20:15

28-Jan-10 20:15

Can you check if the following post helps?
http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/6d16ecce-f92b-4c53-a45b-40119c4566a6[^]

machengzhi3-Feb-10 20:36

3-Feb-10 20:36

Dear Rejeesh.T.S, thanks for your help, I have resovled my problem. I reviewed many articles about MSVCR80D.DLL and MSJAVA.DLL lost. These DLLs will be installed in system32 folder if you install VS2005. When I firstly installed VS2008 and then installed VS2005 sencondly, these DLLs would not be installed.So problem appeared. If you installed these IDE in adverse order, problem will not appeared. I copy msvcr80D.dll, msvcm80D.dll and msjava.dll in the system32 folder, problem disappeared. Thank you again.

norish29-Jan-10 3:26

norish

29-Jan-10 3:26

Do you have the msjava.dll in your pc?
Nowadays, Microsoft dose not deploy that dll when installing the os, I think.
Check your pc configuration, please.

machengzhi2-Feb-10 15:27

Hardcoded CString file path

2-Feb-10 15:27

Yes，there isn't MSJAVA.DLL in my PC. I place MSVCR80D.DLL in the folder where the target DLL exist, dependens report error opening file(MSJAVA.DLL). How can I resolved this problem when using VS2005.My DLL can't be load both in Release and in Debug.

al250028-Jan-10 9:28

al2500

28-Jan-10 9:28

Hi all,

Just trying to hardcode a file path into a CString variable but result ignores backslash (I believe it may be interpreted as control character?).

e.x.

CString Path;

Path = "..\dir1\dir2\filename.ext";

result for path is "..dir1dir2filename.ext"

Also, another nagging string issue I have never understood is a compile error I get when I try to concatenate string literals -

Path = "abcd" + "abcd"; //causes a compile error, "cannot add 2 pointers

My compiler (VS 2005) is set to use Multi-Byte Character Set.

I once tried to research unicode v.s. Multi-Byte Character Set and I could not make heads or tails of the significance.

Thanks for any tips.

CPallini28-Jan-10 9:35

CPallini

28-Jan-10 9:35

al2500 wrote:
Path = "..\dir1\dir2\filename.ext";

'\' must be escaped (repeated since it is the escape character) in a string literal, change to

Path = "..\\dir1\\dir2\\filename.ext";

al2500 wrote:
Path = "abcd" + "abcd";

'+' is not the concatenation operator for string literals, you should change it to:

Path = "abcd" "abcd";

Path = "abcd";
Path += "abcd";

Path = CString("abcd") + CString("abcd");

Richard MacCutchan28-Jan-10 10:13

Richard MacCutchan

28-Jan-10 10:13

CPallini wrote:
Path = "abcd";
Path += "abcd";

I think not.

MVP 2010 - are they mad?

CPallini28-Jan-10 10:35

CPallini

28-Jan-10 10:35

Well, you should ask MS to change the documentation [^], [^] and, above all, persuade the compiler of ... Roll eyes | :rolleyes:

Richard MacCutchan28-Jan-10 11:23

Richard MacCutchan

28-Jan-10 11:23

Apologies, you are, or should be, right. I really need to stay away from MFC questions.

MVP 2010 - are they mad?