C / C++ / MFC Discussion Boards

Michigan185430-Nov-03 6:16

30-Nov-03 6:16

What you did should work.

However, it will not work if CFont * is declared in the stack. You can use a member variable instead.

Examples:

void CMyClass::IncorrectFunction()
{
CFont *font;
LOGFONT lf; // Used to create the CFont.
memset(&lf, 0, sizeof(LOGFONT)); // Clear out structure.
lf.lfHeight = 20; // Request a 20-pixel-high font
strcpy(lf.lfFaceName, "Arial"); // with face name "Arial".
font.CreateFontIndirect(&lf); // Create the font.
m_Sample.SetFont(&font);
}

void CMyClass::CorrectFunction()
{
// CFont *m_font; // m_font is declared as a mmber of CMyClass
LOGFONT lf; // Used to create the CFont.
memset(&lf, 0, sizeof(LOGFONT)); // Clear out structure.
lf.lfHeight = 20; // Request a 20-pixel-high font
strcpy(lf.lfFaceName, "Arial"); // with face name "Arial".
m_font.CreateFontIndirect(&lf); // Create the font.
m_Sample.SetFont(&m_font);
}

Hope it helps,
Mike

COleDropTarget.Register() problem - HELP !

Still learning how to code30-Nov-03 5:13

Still learning how to code

30-Nov-03 5:13

Hi, I'm trying to implement drag and drop for my application and, as a start (having done a bit of reading), have created a standard MDI ap using Developer Studio. In the view, I have (i) overridden InitInstance()and added m_OleDropTarget.Register(this); where m_OleDropTarget is a COleDropTarget object and (ii) added the function OnDragEnter() using Class Wizard. Having set a break point in OnDragEnter(), I ran the ap., opened Window Explorer, and dragged a file across my ap’s view. However, I didn’t reach the breakpoint. I have now discovered that Register() function fails on the last line shown below:-

BOOL COleDropTarget::Register(CWnd* pWnd)
{
ASSERT_VALID(this);
ASSERT(m_hWnd == NULL); // registering drop target twice?
ASSERT_VALID(pWnd);

LPUNKNOWN lpUnknown = (LPUNKNOWN)GetInterface(&IID_IUnknown);
ASSERT(lpUnknown != NULL);

// the object must be locked externally to keep LRPC connections alive
if (CoLockObjectExternal(lpUnknown, TRUE, FALSE) != S_OK)
return FALSE;
…..
…..
}

I don’t understand the comment that “the object must be locked exrernally tokeep LRPC connections alive”
And therefore what is causing the failure. Can anyone enlighten me as to what I need to do in my test ap to overcome this failure ?

Doug

Re: COleDropTarget.Register() problem - HELP !

Jörgen Sigvardsson30-Nov-03 11:47

Jörgen Sigvardsson

30-Nov-03 11:47

Did you call CoInitialize[Ex]()?

--
Talk to the hand!

Re: COleDropTarget.Register() problem - HELP !

Still learning how to code30-Nov-03 21:42

Still learning how to code

30-Nov-03 21:42

Jörgen Sigvardsson wrote:
Did you call CoInitialize[Ex]()?

Hi Jorgen - thanks for the reply. I found my problem just after I made the posting (typical, eh !!) - I needed to select the tick boxes for OLE Automation and OLE Controls when generating the project using AppWizard - it doesn't seem to have included COInitialize() in my source files, but it's got me over the problem, until the next one pops up ...... ! Thanks again !;)

Doug

ShellExecute problem

nss30-Nov-03 5:04

nss

30-Nov-03 5:04

I finally settled on this but am still uneasy.

HINSTANCE res = ShellExecute(NULL,"Open", helpFile, "","E:\\", SW_SHOWNORMAL);

int r = (int)res;

if(r <=32)ShellExecute(NULL,"Open", helpFile, "","C:\\", SW_SHOWNORMAL);

I imagine all I need in the 5th paramtere is the drive letter where the explorer exe is stored. My assumption that its either in E or C is dangerous. How should I handle this dilemma?
Thanks,
ns

Re: ShellExecute problem

BaldwinMartin30-Nov-03 6:20

BaldwinMartin

30-Nov-03 6:20

SHELLEXECUTEINFO sei;
ZeroMemory(&sei, sizeof(SHELLEXECUTEINFO));
sei.cbSize = sizeof (SHELLEXECUTEINFO);
sei.lpVerb = NULL;
sei.lpFile = m_strYourEXEFile;
sei.nShow = SW_SHOW;
sei.hInstApp = NULL;
sei.lpDirectory = NULL;
sei.fMask = SEE_MASK_DOENVSUBST|SEE_MASK_NOCLOSEPROCESS;
sei.lpParameters = NULL;
if (ShellExecuteEx (&sei) )
return TRUE;
else
return FALSE;
}

Best Wishes and Happy Holiday's,
ez_way

Re: ShellExecute problem

nss30-Nov-03 6:53

nss

30-Nov-03 6:53

I think I didnt explain right: I want the .htm file to open up in explorer. Its not an exe file.
Thanks,
ns

Re: ShellExecute problem

Michael Dunn30-Nov-03 8:38

Michael Dunn

30-Nov-03 8:38

Just pass NULL for the starting directory, that is unimportant when you're running IE to show a web page

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
If my rhyme was a drug, I'd sell it by the gram.

Re: ShellExecute problem

BaldwinMartin30-Nov-03 19:49

BaldwinMartin

30-Nov-03 19:49

sorry my mistake.

Best Wishes and Happy Holiday's,
ez_way

Setting File Attributes

#realJSOP30-Nov-03 3:44

#realJSOP

30-Nov-03 3:44

Visual C++ 6.0/SP5

I have written a program that sets folders to be either "hidden" or "normal" (based on user selections). This program works just fine on Win2K and WinXP, but Win98 users aren't seeing any success at all. Here's the code I'm using:

void CMyClass::ChangeFolderAttributes(CPersonality* pItem)
{
	if (g_pPersonHelper->GetChangeTrackFiles())
	{
		CTracksINI* pTracksINI = GetSimTrackList(SIM_NR2K3);
		if (pTracksINI)
		{
			CString sInstalledTrackDir = "";
			CString sInstalledFullPath = "";
			int nInstalledCount = pTracksINI->GetCount();

			for (int i = 0; i < nInstalledCount; i++)
			{
				// get the track folder name
				sInstalledTrackDir = pTracksINI->GetTrack(i)->GetTrackDir();

				// make a fully qualified path
				sInstalledFullPath.Format("%stracks\\%s", m_sSimPath, sInstalledTrackDir);

				// see if it's in the trackset
				bool  bInTrackSet = g_pTrackSetHelper->GetTrackSet(pItem->GetTrackSet())->TrackIsInSet(sInstalledTrackDir);

				DWORD dwDesiredAttrib = (bInTrackSet) ? FILE_ATTRIBUTE_NORMAL : FILE_ATTRIBUTE_HIDDEN;

				BOOL  bResult     = SetFileAttributes((LPCTSTR)sInstalledFullPath, dwDesiredAttrib); 
			}
		}
		else
		{
			// pTracksINI is NULL - not an error
		}
	}
	else
	{
		// user doesn't want to play with tracksets - not an error
	}
}

I've scoured the MSDN stuff, google the API calls, and checked a number of programming bulletin boards, but there is no mention of an incompatibility.

The one thing I did notice is that when I manually select a folder and set it to hidden (using Windows Explorer) Win2k asks is I also want to hide all of the sub-items. I don't have a Win9x box, so I can't see if Win9x does the same thing, but I don't remember that happening.

------- signature starts

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"You won't like me when I'm angry..." - Dr. Bruce Banner

Please review the Legal Disclaimer in my bio.

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Re: Setting File Attributes

Michael Dunn30-Nov-03 8:49

Michael Dunn

30-Nov-03 8:49

Two things I'd change.
1. The line that builds the full path:

sInstalledFullPath.Format("%stracks\\%s", m_sSimPath, sInstalledTrackDir);

is assuming backslashes in certain places. Is that always right? I'd use the shlwapi functions instead (like PathAppend()) to build the name.

2. You're calling SetFileAttributes() without getting the existing attributes first. This results in you unsetting the FILE_ATTRIBUTE_DIRECTORY attribute, which might be what's causing the error. You should always get the current attrs and modify them. I'd do:

DWORD dwAttrs = GetFileAttributes ( sInstalledFullPath );
DWORD dwDesiredAttrib = bInTrackSet ? FILE_ATTRIBUTE_NORMAL : FILE_ATTRIBUTE_HIDDEN; 
 
  if ( INVALID_FILE_ATTRIBUTES == dwAttrs )
    // handle error...
  else
    {
    dwAttrs &= ~(FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_HIDDEN);
    dwAttrs |= dwDesiredAttrib;
    BOOL bResult = SetFileAttributes ( sInstalledFullPath, dwAttrs );
    }

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
If my rhyme was a drug, I'd sell it by the gram.

How Creating Login with Password included by Dot?

YULISA30-Nov-03 3:43

YULISA

30-Nov-03 3:43

How Creating Login with Password included by Dot?
I need to connected also thru Telnet/FTP but to access to a Tandem machine (or whatever server types)from these must be(for example:"User=yulisa,password=yls.11").

-Also,How to facilitate Fstream(input.dat -->output.dat),which
at the middle after recieve from input.dat, I must absorb each/all field's value to Edit Boxes navigated by Next-Previous Icon,or by DBGrid provided by MFC,then all those records can be Restored to Database,ex:SQL Server for next purposes manipulation???(maybe Database as the Output File)
....I Need the Right Ansewr Soon, Thanks a Lot Before....

How Creating Login with Password included by Dot?

YULISA30-Nov-03 3:38

YULISA

30-Nov-03 3:38

How Creating Login with Password included by Dot?

USB Port & IEEE1394

mhmoud rawas30-Nov-03 2:22

mhmoud rawas

30-Nov-03 2:22

Hi all ,
does any body knows any thing about programming USB Port or IEEE 1394 (Firewire)

Mhmoud Rawas
------------
Software Eng.

Help of the program

Member 64882830-Nov-03 2:04

Member 648828

30-Nov-03 2:04

For visual c++ can provide the help or explanation button usage...Mean that when the mouse cursor point to any button there can provide explanation function of this button!!!

Re: Help of the program

Michael P Butler30-Nov-03 3:16

Michael P Butler

30-Nov-03 3:16

Do you mean tooltips?

Have a search on MSDN for tooltip or look here http://www.codeproject.com/miscctrl/#Tooltips[^]

Michael

Blue canary in the outlet by the light switch
Who watches over you
Make a little birdhouse in your soul - They Might Be Giants

regd CFile Object

karteek30-Nov-03 1:24

karteek

30-Nov-03 1:24

Hi,
I wrote a program using the CFile object.It is giving the following error.

c:\program files\microsoft visual studio\vc98\mfc\include\afxv_w32.h(14) : fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h>

I included windows.h and afx.h as headers.What else should I include to get rid of this problem

Karteek

Re: regd CFile Object

David Wulff30-Nov-03 2:36

David Wulff

30-Nov-03 2:36

karteek wrote:
I included windows.h and afx.h as headers.What else should I include to get rid of this problem

Don't inlcude windows.h, afxv_w32.h takes care of that for you via afx.h.

David Wulff
The Royal Woofle Museum

Putting the laughter back into slaughter

GetSystemMenu() doesn't contain Minimize/Maximize

ohadp30-Nov-03 1:12

ohadp

30-Nov-03 1:12

My System-Menu only contains 'Close' and 'Move' commands.

What am I missing ? any specific style ?

Re: GetSystemMenu() doesn't contain Minimize/Maximize

Michael Dunn30-Nov-03 8:56

Michael Dunn

30-Nov-03 8:56

Your window needs to have the WS_MAXIMIZEBOX or WS_MINIMIZEBOX style for those items to be on the menu.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
You cannot stop me with paramecium alone!

Re: GetSystemMenu() doesn't contain Minimize/Maximize

ohadp30-Nov-03 18:43

ohadp

30-Nov-03 18:43

I have them both but alas Frown | :-(

My window wouldn't respond to the 'minimize-all' button until I added WS_MINIMIZEBOX, but still the option doesn't show on my window

SHGetPathFromIDList fails for the PIDL of the Recycle-Bin

ohadp30-Nov-03 0:44

ohadp

30-Nov-03 0:44

I use SHBrowseForFolder, select the Recycle-Bin, get a PIDL, and fail to convert it to a legitimate path.

Is this by design ?

Re: SHGetPathFromIDList fails for the PIDL of the Recycle-Bin

Jörgen Sigvardsson30-Nov-03 11:51

Jörgen Sigvardsson

30-Nov-03 11:51

I think so, because there is no single one recycle bin. IIRC, there's a recycle bin on each drive. The one you see on the deskop is just a "union" of all the individual recycle bins.

--
Talk to the hand!

WSANO_DATA- WHAT does this mean?

Stan the man30-Nov-03 0:20

Stan the man

30-Nov-03 0:20

Hi. I am trying to connect to a remote module by TCPIP. It keeps failing at gethostbyaddr. THe error is WSANO_DATA. MSDN says that this means "Valid name, no data record of requested type." What does this mean? What do I need to change or do for this. From hyperterminal, it will connect correctly so there must be something simple to do to take care of this I think.

THanks!!

how to create a shortcut to a dialup networking connection programmtically

jetboy29-Nov-03 23:58

jetboy

29-Nov-03 23:58

i have been able to successfully create a RAS connection using visual C++, what i'm looking for now is how to set a shortcut on the desktop for this connection, i could do that to a file ok, but to a dialup networking you don't have an actual (path) to it, any help is appreciated

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