"unresolved external symbol"

[NewfieTechie]

Hello,

I am not the best with C++, and I am being forced to use Visual Studio 2010 which I am not very comfortable with, so excuse my lack of knowledge.


I am attempting to compile code that was supplied to me by TI to operate a micro controller... getting the following errors:

1>DirDialog.obj : error LNK2019: unresolved external symbol __imp__MakeSureDirectoryPathExists@4 referenced in function "protected: void __thiscall CDlgWnd::OnOpen(void)" (?OnOpen@CDlgWnd@@IAEXXZ)
1>TabNFC.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall CDirDialog2::~CDirDialog2(void)" (??1CDirDialog2@@UAE@XZ) referenced in function "protected: void __thiscall CTabNFC::OnNFCNewDname(void)" (?OnNFCNewDname@CTabNFC@@IAEXXZ)
1>TabNFC.obj : error LNK2019: unresolved external symbol "public: int __thiscall CDirDialog2::DoBrowse(void)" (?DoBrowse@CDirDialog2@@QAEHXZ) referenced in function "protected: void __thiscall CTabNFC::OnNFCNewDname(void)" (?OnNFCNewDname@CTabNFC@@IAEXXZ)
1>TabNFC.obj : error LNK2019: unresolved external symbol "public: __thiscall CDirDialog2::CDirDialog2(void)" (??0CDirDialog2@@QAE@XZ) referenced in function "protected: void __thiscall CTabNFC::OnNFCNewDname(void)" (?OnNFCNewDname@CTabNFC@@IAEXXZ)
1>.\Debug\RFIDread.exe : fatal error LNK1120: 4 unresolved externals
1>
1>Build FAILED.

From my limited knowledge I thought it was just a missing library... but only one came with the package, I added it to the libraries folder, didn't help. I added it in the "Additional Dependencies" option, get a fatal error, cant read it. Believe it may be some other issue...

any ideas?

[pogrady]

Which configuration did you add it to?

[NewfieTechie]

Properties > Config > Linker > Input > Additional Dependencies

[NewfieTechie]

Anyone?

[coder777]

Is the library suitable for the visual C++ compiler?

If so, did you add the appropriate path to the library (in the section above 'Linker /Input')?

[NewfieTechie]

Yes, adding the library doesn't change anything.

[ajh32]

Although you have provided the header to the functions you are using it does look as though you are not providing the library i.e. .lib file for these functions.

[NewfieTechie]

That's what I thought, but none came with the package... just one unrelated library.

[ajh32]

You will need to generate your own lib file then see:

http://adrianhenke.wordpress.com/2008/12/05/create-lib-file-from-dll/

[NewfieTechie]

The only .dll file I got with the package was the one that matches the already made library...

Perhaps I could post a link to the package, would that help you help me?

[ajh32]

Send me a PM

[ajh32]

All sorted then?

[NewfieTechie]

No sorry, bust with other work. PM on the way.

[ajh32]

You need to add the following to your Linker\Input\AdditionalDependancies:

Dbghelp.lib

That should resolve your issues. Let me know if you are ok then or whether you have additional issues.

Andrew

[coder777]

NewfieTechie wrote:

Yes, adding the library doesn't change anything.

Did you read my post? I was refering to path. Did you set the path to the library?

[NewfieTechie]

ajh32:
I added Dbghelp.lib, but got the same error...


coder777:
yes, I added the path. Sorry.

[ajh32]

re:

ajh32:
I added Dbghelp.lib, but got the same error...

Well I did the same to your RFDread project and it then compiled and worked. The 'Dbghelp.lib' on my PC is located in:

c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib

and the associated header is located in:

c:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include

Why don't you locate where these files are located on your PC and ensure that the filepaths are on your PATH as @coder777 has suggested. Once the compiler and linker can find the required files all will be well.

[NewfieTechie]

Not working for me. Am I doing something wrong? What compiler are you using?

Screencap of my compiler:
http://i45.tinypic.com/oq92rp.jpg

[ajh32]

I'm using VS2010.

You appear to have changed the project, why have you added the 'DbgHelp.h' file to the project?

You have used the 'MakeSureDirectoryPathExists(...)' function on line#233 and line#400 of the 'DirDialog.cpp' file.

All I did to resolve the linker error was to add the 'Dbghelp.lib' to the additional includes:

http://i1102.photobucket.com/albums/g452/AndyInSurrey/Capture_zpsf48e41f9.jpg

[coder777]

Am I doing something wrong?

Yes, you must not provide the path in the Input section. The path must be set in the General section.

if you provide a path in the 'Additional Dependencies' the library is not recognized and silently dropped.

Wonder what the Dbghelp.lib has to do with it