C / C++ / MFC Discussion Boards

Mark Salsbery17-Jan-07 8:48

17-Jan-07 8:48

Is the DLL already implementing a COM object? If so then it should work no problem.
I thought one of the ideas behind com was portable objects.

If it's not a com DLL then there's no "Add Reference" that will load the DLL. You need to link
to it (implicitely or explicitely using LoadLibrary() or similar). If it uses MFC you may have
problems. If it uses the CRT you may have problems as well since you'll have mixed versions
between the app and the DLL.

Mark

Re: Newbie - Memory sharing in COM

led mike18-Jan-07 4:37

led mike

18-Jan-07 4:37

ArtiGujare wrote:
I tried adding the VC6dll in my VS2005App using "Add Reference".

"Add Reference" is for adding .NET assemblies in a "Managed" Project. You are in the C++ forum indicating that your project is a "Native" project. Therefore you do not add a reference to the DLL. You link to it using a .Lib file just as before. Using a DLL from a C++ project is pretty basic stuff, why are you having problems with this? Perhaps if you give us more information about your level of experience we might provide more targeted information.

led mike

Problem loading DLL

Eikthrynir17-Jan-07 5:44

Eikthrynir

17-Jan-07 5:44

Hi!
Does anyone know why would an extension DLL not load when using the following code?

if ( AfxLoadLibrary( "MyDLL.dll" ) == NULL )
  AfxMessageBox( "Error loading library." );

So, MyDLL.dll is an extension DLL. AfxLoadLibrary always returns NULL, even though the calling process and MyDLL.dll are in the same directory.

Any help will be greatly appreciated!
Thanks in advance!

Re: Problem loading DLL

Mark Salsbery17-Jan-07 5:51

Mark Salsbery

17-Jan-07 5:51

What does your DllMain look like in the extension DLL? Is initialization failing there?

The app and the DLL are using the DLL version of MFC, correct?

Mark

Re: Problem loading DLL

Eikthrynir17-Jan-07 5:56

Eikthrynir

17-Jan-07 5:56

This is how my DllMain looks like:

extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
	// Remove this if you use lpReserved
	UNREFERENCED_PARAMETER(lpReserved);

	if (dwReason == DLL_PROCESS_ATTACH)
	{
		TRACE0("MYDLL.DLL Initializing!\n");

		// Extension DLL one-time initialization
		if (!AfxInitExtensionModule(MyDLL, hInstance))
			return 0;

		new CDynLinkLibrary(MyDLL);
	}
	else if (dwReason == DLL_PROCESS_DETACH)
	{
		TRACE0("MYDLL.DLL Terminating!\n");
		// Terminate the library before destructors are called
		AfxTermExtensionModule(MyDLL);
	}
	return 1;   // ok
}

I even put these lines of code right at the begining of DllMain:

CFile log;
log.Open( "log.001", CFile::modeCreate | CFile::modeWrite, NULL );
log.Write( "@", 1 );
log.Close( );

I ran the program using the new version of mydll.dll and NO log.001 was created.
So DllMain does not get executed.

Re: Problem loading DLL

Mark Salsbery17-Jan-07 6:03

Mark Salsbery

17-Jan-07 6:03

You shouldn't need to write a log file. "MYDLL.DLL Initializing!" should show up in your debug
output window. You could put a breakpoint in there as well.

It's a mystery Smile | :)

Have you tried David Crow's suggestion?

Re: Problem loading DLL

Eikthrynir17-Jan-07 5:59

Eikthrynir

17-Jan-07 5:59

Problem solved!!!!!!!!!!
MyDLL.dll was using another dll which did not exist.

Thank you for your time!

Re: Problem loading DLL

Mark Salsbery17-Jan-07 6:04

Mark Salsbery

17-Jan-07 6:04

Eikthrynir wrote:
MyDLL.dll was using another dll which did not exist.

Cool

Re: Problem loading DLL

David Crow17-Jan-07 5:51

David Crow

17-Jan-07 5:51

Eikthrynir wrote:
...even though the calling process and MyDLL.dll are in the same directory.

Just for grins, try specifying an absolute path to mydll.dll.

Is your app multithreaded?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Network communication using XDR ?

pc_dev17-Jan-07 4:07

pc_dev

17-Jan-07 4:07

I am building a client server application (socket based) in which i have to transfer data between different systems (different harware and operating systems). After some survery I have found that XDR is a library which provides data potability amoung various operating systems (windows/unix) but i cant found any resource/example to use XDR in VC6. Please provide a link/etc of XDR or any other free library that provides reliable cross plateform communication and dataportability using VC6, on the other side (unix) simple c++ will be used.

Service problem ?

Sakthiu17-Jan-07 4:07

Sakthiu

17-Jan-07 4:07

Dear All,

My service program is not able to interact with desktops. Why ?

Can any one answer this ?

Thanks.

Re: Service problem ?

David Crow17-Jan-07 4:14

David Crow

17-Jan-07 4:14

Sakthiu wrote:
My service program is not able to interact with desktops. Why ?

Have you configured it to do so?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

How to insert a triangle (delta) in header of list contrl ?

pc_dev17-Jan-07 3:57

pc_dev

17-Jan-07 3:57

I am using list control (report view)

in windows List control headers contain a triangle shape which moves its direction when we click on the respective header showing sort order how can this delta be inserted in header?

An other query please

Is it possible to have multiple lines in an item or subitem of list control?

I would be extremly thankful for providing the solutions to above problems.

Re: How to insert a triangle (delta) in header of list contrl ?

Mark Salsbery17-Jan-07 4:38

Mark Salsbery

17-Jan-07 4:38

pc_dev wrote:
in windows List control headers contain a triangle shape which moves its direction when we click on the respective header showing sort order how can this delta be inserted in header?

It's not built-in to the control but you can owner-draw the header and add one yourself.

Mark

Re: How to insert a triangle (delta) in header of list contrl ?

led mike17-Jan-07 5:57

led mike

17-Jan-07 5:57

Not sure but I did this in the past and maybe did it with an image rather than owner draw.

led mike

Re: How to insert a triangle (delta) in header of list contrl ?

Mark Salsbery17-Jan-07 6:08

Mark Salsbery

17-Jan-07 6:08

You can put images in column headers? I'm going to look into that. I need something similar Smile | :)

Thanks man,
Mark

Re: How to insert a triangle (delta) in header of list contrl ?

led mike17-Jan-07 6:10

led mike

17-Jan-07 6:10

Yes found the old project. Used a ImageList and then:

HDITEM hItem;
ZeroMemory( &hItem, sizeof(hItem));
hItem.mask = HDI_IMAGE | HDI_FORMAT;
_pList->GetHeaderCtrl()->GetItem( nCol, &hItem);
hItem.iImage = nImg;
hItem.fmt = HDF_LEFT | HDF_IMAGE | HDF_STRING | HDF_BITMAP_ON_RIGHT;

led mike

Re: How to insert a triangle (delta) in header of list contrl ?

Mark Salsbery17-Jan-07 6:29

Mark Salsbery

17-Jan-07 6:29

Cool! Thank you!

It's as easy as tab controls Smile | :)

Re: How to insert a triangle (delta) in header of list contrl ?

Ravi Bhavnani17-Jan-07 6:09

Ravi Bhavnani

17-Jan-07 6:09

pc_dev wrote:
how can this delta be inserted in header?

See this[^] article.

pc_dev wrote:
Is it possible to have multiple lines in an item or subitem of list control?

See this[^] article.

/ravi

This is your brain on Celcius
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Re: How to insert a triangle (delta) in header of list contrl ?

Michael Dunn17-Jan-07 16:04

Michael Dunn

17-Jan-07 16:04

This feature is built-in to commctrl v6, see here for sample code: clickety[^]

--Mike--
Visual C++ MVP Cool | :cool:

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How to link a directory to a file ?

kbekri17-Jan-07 3:21

kbekri

17-Jan-07 3:21

Hello.

I hope that I am using the right place to post.

I am using a file format with a simple file myfile.x and a corresponding data directory with multiples files under.
I want to link my .x file to the directory.

Like Internet Explorer do when I save an html file to disk : it create an html file and a data directory aside. If anybody delete the file : it also delete the directory.

Do anybody known a way to do that ?
(I am under Visual C++ 6)

(With CopyHookHandlers?)

Thanks for your help.

Kcm.

Mulitline CEdit field lock up in release build - I am desparate

tieng8617-Jan-07 3:19

tieng86

17-Jan-07 3:19

I have a grid window with one row is a multiline edit field. This row is a class derived from CEdit. The vertical scroll bar is enabled. The field is initialize with a long string. The first tiem the mouse clicked on this field, the field displays the string properly with the line wrap and the vertical scroll shown and active. The second time the mouse focus is back to this CEdit field, the field lock up, no scroll bar is visible. The grid is derived from Stingray's Objective Grid library 7.01

The lock up only happy when running the code in Release mode. If I step through or run the program in debug the problem does not occur.

Does anyone know of a similar problem and how to fix this? Thanks in advance

Re: Mulitline CEdit field lock up in release build - I am desparate

pc_dev17-Jan-07 4:16

pc_dev

17-Jan-07 4:16

A Program in debug or release build must work similarly. once i had a similar problem, i delivered the debug version because it was behaving accordingly. it has nothing to do with grids or any thing else, it looks like VC6 bug (i think).

Re: Mulitline CEdit field lock up in release build - I am desparate

toxcct17-Jan-07 4:18

toxcct

17-Jan-07 4:18

pc_dev wrote:
once i had a similar problem, i delivered the debug version

see this[^]

Don't know where to start ?
Refer the Forums Guidelines and ask a friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: Mulitline CEdit field lock up in release build - I am desparate

tieng8617-Jan-07 6:48

tieng86

17-Jan-07 6:48

Thanks. Your answers gave me idea to build the Release version with /D _DEBUG instead of /D NDEBUG. Looks like it solves my problem.

Before, I suspected that optimization had something to do with the problem. I tried turn off optimization but it did not work.

Thanks for all your replies. I am grateful.

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