C / C++ / MFC Discussion Boards

ns16-Jul-04 3:43

16-Jul-04 3:43

I had some c (not c++) files which I put into a win32 dll project and compiled. The h file looks like:

KLEINRAYC_API int
RAY_KLEIN_CC
(params_t * params);

and the .c file has the same thing in it:

KLEINRAYC_API int
RAY_KLEIN_CC
(params_t * params)
{

}

I compiled this and used the resulting .lib and .dll files in another project (where I did #include for the .h file and linked to the .lib file in project settings). However the linker says:

error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl RAY_KLEIN_CC(struct CAD_CAC_params *)" (__imp_?RAY_KLEIN_CC@@YAHPAUCAD_CAC_params@@@Z)

Now I had done the exact same thing with another dll except the files in that one were .cpp (not c) and that doesnt cause any problems.

What do I need to do with this .c dll to make the linker happy?

Thanks,
sb

Re: win32 dll linking problem

Antti Keskinen16-Jul-04 8:44

Antti Keskinen

16-Jul-04 8:44

The solution is to change files in the project you're using the DLL in.

Try using extern "C" keyword in all declarations in the DLL header file of the new project. This marks all functions and variables inside the DLL to use C-linkage. The default is to use C++-linkage, and it will cause problems with C DLL's, like you've seen.

Does it compile properly now ? Any new errors ?

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Re: win32 dll linking problem

bonosa16-Jul-04 23:39

bonosa

16-Jul-04 23:39

That was exactly the solution!!! I was worried I would have to go the loadlibrary route. Many thanks,
sb

clipboard

albd16-Jul-04 3:13

albd

16-Jul-04 3:13

How can develop the multiple clipboard using c++ (like Word...)?
Thanks

Re: clipboard

vcplusplus16-Jul-04 3:31

vcplusplus

16-Jul-04 3:31

I have never heard of a multiple clipboard. Maybe because I only use Word 97.

Check out this site.
http://www.codeproject.com/clipboard/

Multiple views in one frame

Maarten Kools16-Jul-04 1:45

Maarten Kools

16-Jul-04 1:45

Hi,

I'm creating an MDI application in MFC but I need to display different views which correspond with some user setting. But I can't figure out how to display two different views in the same frame window. So I want to display either view A or view B, not both at the same time. Is this even possible?

Re: Multiple views in one frame

Anonymous16-Jul-04 1:48

Anonymous

16-Jul-04 1:48

Try using splitter windows

Re: Multiple views in one frame

Maarten Kools16-Jul-04 2:03

Maarten Kools

16-Jul-04 2:03

But won't the user be able to move the splitter back and forth?

What I exactly want is to have view A be visible with some combo menu selection, and view B being visible with another combo menu selection

Re: Multiple views in one frame

Bob Stanneveld16-Jul-04 2:51

Bob Stanneveld

16-Jul-04 2:51

If that's the only difference between both views, try loading the contents of the combo box at runtime!

Then this would be the case:
Step 1: Create the window and one or more CDoc's. (Keep the window invisible)
Step 2: Load the contents of the combo box dynamically (probably in OnInitialUpdate) according to your specifications.
Step 3: Show the window.

Good luck!

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

Re: Multiple views in one frame

peterchen16-Jul-04 3:15

peterchen

16-Jul-04 3:15

This is for SDI, but can be adapted to SDI
the basic idea is to create all views and hide all but the one visible. The Doc/View architecture already takes care of managing multiple views (if used correctly)

Clickety[^]

or maybe our friend[^] can help

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist || Agile Programming | doxygen

Re: Multiple views in one frame

mostafa_pasha16-Jul-04 5:00

mostafa_pasha

16-Jul-04 5:00

To build an MDI application with two views
1. Build an MDI application by using MFC AppWizard. AppWizard will create a skeleton MDI application with a single view.
2. Add a new class derived from the CView class.
3. Add debug and nondebug versions of the GetDocument function.
Use the GetDocument functions from your existing view class as a model.
4. Include the header file for the document class in the source file of the new view class.
5. Place the command handlers in the CChildFrame class.
It is easier to access the view or the document from CChildFrame rather than from the view class. Use the CFrameWnd::GetActiveView and CFrameWnd::GetActiveDocument functions to access the views and the document.
6. Add a handler for the OnDraw event of the new view class.
At this point, you must decide whether you want users to select the type of view at application startup, or whether you want to have your application start with a default view. In either case, the user can select another view at run time.

void CMainFrame::OnWindowItalics()
{
if (0 == m_pItalicsTemplate)
{
m_pItalicsTemplate = new CMultiDocTemplate(
IDR_XXXXTYPE,
RUNTIME_CLASS(CXXXXViewsDoc),
RUNTIME_CLASS(CChildFrame),
RUNTIME_CLASS(CItalicsView));
}

CMDIChildWnd* pActiveChild = MDIGetActive();
CDocument* pDocument;
if (NULL == pActiveChild ||
(pDocument = pActiveChild->GetActiveDocument()) == NULL)
{
TRACE0("Warning: No active document.\n");
AfxMessageBox(AFX_IDP_COMMAND_FAILURE);
return; // command failed
}

CFrameWnd* pFrame = m_pItalicsTemplate->
CreateNewFrame(pDocument, pActiveChild);
if (NULL == pFrame)
{
TRACE0("Warning: failed to create new frame.\n");
return; // command failed
}

m_pItalicsTemplate->InitialUpdateFrame(pFrame, pDocument);
}

More problems with service pack 6

Salvador Dali16-Jul-04 0:26

Salvador Dali

16-Jul-04 0:26

After a serialization problem which occured because of changes in sp6, I now ran into another problem with regard to localized resources.

With sp5 I could create my application using US English resources in appwizard and then change into any language I wanted for any resource I needed from the properties dialog of each resource.

Now, whenever I make the change, I get garbled letters!!! Mad | :mad:

Anybody else ran into this? Any way around it?

Have no fear of perfection - You will never reach it

XP Styles and HP_HEADERSORTARROW

Paul Vickery16-Jul-04 0:24

Paul Vickery

16-Jul-04 0:24

Does anyone have experience of using HP_HEADERSORTARROW? I am assuming that it should be used with DrawThemeBackground. I have found that it is not supported in any of the standard XP styles, so I am having to draw my own header arrow. Onw thing I would like to know is how to use it, so I can have code in there which uses it when available.

This though means that if the text doesn't fit next to it then the arrow draws over the top of it. I don't really want to draw anything I don't have to, ie text, background, just to get the arrow.

What I'm really after is an XP-styled sort-header control.

Any ideas?

"The way of a fool seems right to him, but a wise man listens to advice" - Proverbs 12:15 (NIV)

Re: XP Styles and HP_HEADERSORTARROW

Paul Vickery16-Jul-04 1:19

Paul Vickery

16-Jul-04 1:19

OK, I've done a bit more searching, and found out that I can use HDF_SORTUP and HDF_SORTDOWN. See this[^] and this[^].

"The way of a fool seems right to him, but a wise man listens to advice" - Proverbs 12:15 (NIV)

IDE/Editor and syntax highlighting

Jörgen Sigvardsson16-Jul-04 0:07

Jörgen Sigvardsson

16-Jul-04 0:07

I can't seem to find an official way to add new keywords to the C++ highlighting engine. Are there any unofficial tricks you'd like to share?

--
Ich bin Joachim von Hassel, und ich bin Pilot der Bundeswehr.
Welle: Erdball - F104-G Starfighter

Re: IDE/Editor and syntax highlighting

Johann Gerell16-Jul-04 0:32

Johann Gerell

16-Jul-04 0:32

Do you mean the "User Keywords" or the standard C++ keywords?

For the former: I have a usertype.dat file in

C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\IDE

That file is just the "User Keywords", one per line. Change their syntax highlighting color via

Tools > Options > Environment > Fonts and Colors > Display items > User Keyword

For the latter: I don't think that's doable.

--
The Blog: Bits and Pieces

Which directory is my app running out of?

Joel Holdsworth16-Jul-04 0:00

Joel Holdsworth

16-Jul-04 0:00

Is there an easy way to determine the directory that my CWinApp is running out of?

Joel Holdsworth

Re: Which directory is my app running out of?

Antony M Kancidrowski16-Jul-04 0:31

Antony M Kancidrowski

16-Jul-04 0:31

Look at GetCurrentDirectory()

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: Which directory is my app running out of?

David Crow16-Jul-04 2:52

David Crow

16-Jul-04 2:52

Antony M Kancidrowski wrote:
Look at GetCurrentDirectory()

Which could be anything. There is only one CWD for the whole system and any process can change it at any time. It's never safe to assume anything about the CWD. GetModuleFileName() is what's needed here.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Which directory is my app running out of?

Antony M Kancidrowski16-Jul-04 5:35

Antony M Kancidrowski

16-Jul-04 5:35

Sorry, I didn't read the question as what is the location of the executable.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: Which directory is my app running out of?

bikram singh16-Jul-04 12:40

bikram singh

16-Jul-04 12:40

Your answer is abs right for the problem at hand, however, the current directory is maintained for each process, not system-wide as you suggest.

HTH

Bikram Singh

Re: Which directory is my app running out of?

David Crow19-Jul-04 2:32

David Crow

19-Jul-04 2:32

bikram singh wrote:
...the current directory is maintained for each process, not system-wide...

Indeed. Admittedly, it has been about 11 years since I've had the need to use that particular function. Things change over time, I guess. Blush | :O

Further reading finds that SetCurrentDirectory() is not thread safe, but it is process safe.

Thanks,
DC

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Which directory is my app running out of?

Paul Vickery16-Jul-04 0:34

Paul Vickery

16-Jul-04 0:34

You need to use something like the following, which gets the full path of the executable:

CString sModulePath;
HINSTANCE hInstance = AfxGetInstanceHandle();
GetModuleFileName(hInstance, sModulePath.GetBuffer(MAX_PATH), MAX_PATH);
sModulePath.ReleaseBuffer();

You can then chop the string up using GetFullPathName()

"The way of a fool seems right to him, but a wise man listens to advice" - Proverbs 12:15 (NIV)

Re: Which directory is my app running out of?

peterchen16-Jul-04 2:07

peterchen

16-Jul-04 2:07

..or
CPath::GetModuleFileName().GetPath();
Clickety[^] Cool | :cool:

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist || Agile Programming | doxygen

how to disable messagebox

Member 101812815-Jul-04 23:58

Member 1018128

15-Jul-04 23:58

hai,

I am trying to develop an application,in that i am using one library file,
when i run the application ,a messagebox which is not in my application,but on the library file gets displayed,(i have no coding for that library).
how can i get rid of that messagebox.

is it possible to hide that message box in my application..

Rose | [Rose]

thanks a lot in reading my query,

M.Kailasam

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.