C / C++ / MFC

Re: LoadLibraryW("C:\abc.dll") fails

14-Mar-12 1:18

Show the actual full code of your failing LoadLibrary() call, including (most importantly) the string parameter.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

CPallini14-Mar-12 23:06

CPallini

14-Mar-12 23:06

V K 2 wrote:
"C:\abc.dll"

You know, backslashes should be escaped in quoted strings.
[update]
I see Jochen already suggested it.
[/update]

Veni, vidi, vici.

CMFCMaskedEdit class

David Crow13-Mar-12 10:00

David Crow

13-Mar-12 10:00

Has anyone attempted to use this class and call GetWindowTextLength() to see if the control has any user-typed text in it? I often use this approach to know when to enable/disable the OK button on a dialog. If the control just has the mask in it (i.e., no user-typed text), I consider the control to be empty and thus need to disable the OK button. The problem is that GetWindowTextLength() always returns the length of the mask. I can call GetWindowText() in the EN_CHANGE handler and compare the text to the mask but it always seems to be off by one. In other words, if the mask is "___" and I type a number in that control, GetWindowText() will return "___" instead of "2__".

"One man's wage rise is another man's price increase." - Harold Wilson

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Re: CMFCMaskedEdit class

«_Superman_»13-Mar-12 17:08

«_Superman_»

13-Mar-12 17:08

Check this function - CMFCMaskedEdit::EnableGetMaskedCharsOnly[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: CMFCMaskedEdit class

Randor 13-Mar-12 17:43

Randor

13-Mar-12 17:43

David,

When MFC controls exhibit strange behavior I always take a look at the source code for the control located in the \VC\atlmfc\src\mfc installation path.

If you look at the Microsoft implementation within afxmaskededit.cpp you will find that the CMFCMaskedEdit class handles the WM_GETTEXTLENGTH,WM_GETTEXT and WM_SETTEXT messages overriding the default CWnd behavior. The CMFCMaskedEdit class is actually returning the length of an internal CString buffer in response to the WM_GETTEXTLENGTH message.

Therefore the Microsoft documentation that states: 'EN_CHANGE notification code is sent when the user has taken an action that may have altered text in an edit control. Unlike the EN_UPDATE notification code, this notification code is sent after the system updates the screen.' would not apply to this particular window class.

Unfortunately you will have to implement something outside the box here. A couple of ideas:

Option [1] Highlight all of the code in afxmaskededit.cpp and afxmaskededit.h and copy/paste into DavidCrowsMaskedEdit new class and change/improve the behavior.

Option [2] You could override PreTranslateMessage and check for the WM_KEYUP message belonging to the CMFCMaskedEdit control. Once the control has recieved this message... the CMFCMaskedEdit should have updated its internal buffer because it does its filtering in response to the WM_CHAR message. Note that this method will not handle copy/cut/paste from the clipboard so your mileage may vary.

C++

BOOL YourMaskDlg::PreTranslateMessage(MSG* pMsg)
{
	if(WM_KEYUP == pMsg->message)
	{
		if(::GetDlgCtrlID(pMsg->hwnd) == m_YourMaskEdit.GetDlgCtrlID())
		{
			int iLength = m_YourMaskEdit.GetWindowTextLength();
	
			if(iLength)
			{
				CString str;
				m_YourMaskEdit.EnableGetMaskedCharsOnly(TRUE);
				m_YourMaskEdit.GetWindowText(str);
				str.Remove(_T('_'));

				BOOL UserAddedText = str.GetLength();
			}
		}
	}
	return CDialog::PreTranslateMessage(pMsg);
}

Option [3] You could actually get the window text or text length in your WM_CTLCOLOR handler. Something like:

C++

HBRUSH YourMaskDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

	if(pWnd->GetDlgCtrlID() == m_YourMaskEdit.GetDlgCtrlID())
	{
		//Check to see if user added some text
	}
	return hbr;
}

I know it seems like a complete hack... by looking at window text in the WM_CTLCOLOR handler but that is actually how Dr. Joseph Newcomer did it in his old validating CEdit class.

That is really all I can think of for solving your problem. To be honest I generally avoid many of the MFC classes... I usually reinvent the wheel... because sometimes my wheels are more round. And if my new wheel ends up square... well at least I learned something in the process. Big Grin | :-D

Best Wishes,
-David Delaune

c++ win32 Listview, File List, show folder and app icon using SHGetFileInfo

jkirkerx13-Mar-12 7:59

Re: c++ win32 Listview, File List, show folder and app icon using SHGetFileInfo

13-Mar-12 7:59

I made a Windows Listview control that show the contents of a folder, so the user can select the file to open.

My Listview has 4 columns, the first is filename, which can be a folder or app. In front of the name, for cosmetics, I want to show the icon. So if it's a folder, the folder icon, and the name of the folder appears.

Question:

Am I even on the right track here, using SHGetFileInfo to get the folder icon from Shell32.dll, and how to load the result in an ImageList, so I can program the 1st column with the icon in the image list. I could actually use a little help here on writing the code.

////////////////////////////////////////////////////////////////////////////////////////
// Generate the Folder Icons and Image List

hr = SHGetFileInfo( L"Shell32.dll", 0, &siFolderIcon_Small, sizeof( siFolderIcon_Small ), SHGFI_ICON | SHGFI_SMALLICON | SHGFI_USEFILEATTRIBUTES);
hr = SHGetFileInfo( L"Shell32.dll", 0, &siFolderIcon_Large, sizeof( siFolderIcon_Large ), SHGFI_ICON | SHGFI_LARGEICON | SHGFI_USEFILEATTRIBUTES);
	
HIMAGELIST hil_Folders;
HBITMAP    hbm_Folders;

hil_Folders = ImageList_Create( 16, 16, ILC_COLOR, 2, 0 );
hbm_Folders = ( HBITMAP )LoadImage( ( HINSTANCE )lParam, siFolderIcon_Small.szDisplayName , IMAGE_BITMAP, 0, 0, 0 );


ImageList_Add( hil_Folders, hbm_Folders, NULL );



// End of Generate the Folder Icons and Image List
////////////////////////////////////////////////////////////////////////////////////////

I'm not sure here, if the first code block should load the icon and text in one shot, or as the example shows, load the text, and then go back and load the icon in separate calls. Maybe load the icon in the first call, and then load the text in the second.

// Process the result in this loop cycle
memset( &lv_ProjectOpen_Item_Record, dwIndex, sizeof( lv_ProjectOpen_Item_Record ) ); 

// Column 1 - Filename			
lv_ProjectOpen_Item_Record.iItem = dwIndex;
lv_ProjectOpen_Item_Record.iSubItem = 0;				
lv_ProjectOpen_Item_Record.mask = LVIF_TEXT;
lv_ProjectOpen_Item_Record.cchTextMax = 254;
lv_ProjectOpen_Item_Record.pszText = szFileName;
ListView_InsertItem( lv_ProjectOpen_FileSelect, &lv_ProjectOpen_Item_Record );

// Column 1 - Insert Image
lv_ProjectOpen_Item_Record.mask = LVIF_IMAGE;
lv_ProjectOpen_Item_Record.iImage = 0;
ListView_SetItem( lv_ProjectOpen_FileSelect, &lv_ProjectOpen_Item_Record);			
				
// Column 2 - Date Modified
lv_ProjectOpen_Item_Record.iItem = dwIndex;
lv_ProjectOpen_Item_Record.iSubItem = 1;
lv_ProjectOpen_Item_Record.mask = LVIF_TEXT;
lv_ProjectOpen_Item_Record.cchTextMax = 24;
lv_ProjectOpen_Item_Record.pszText = szDateModified;
ListView_SetItem( lv_ProjectOpen_FileSelect, (const LV_ITEM *)&lv_ProjectOpen_Item_Record);

enhzflep13-Mar-12 13:35

enhzflep

13-Mar-12 13:35

I'm not so sure I haven't misinterpreted your question.

However, do you have a specific requirement to create your own dialog to allow for file selection? I ask, because the first thing I thought when I saw your post was 'what about the GetOpenFileName[^] common dialog?'

Re: c++ win32 Listview, File List, show folder and app icon using SHGetFileInfo

jkirkerx13-Mar-12 16:14

Re: c++ win32 Listview, File List, show folder and app icon using SHGetFileInfo

13-Mar-12 16:14

I didn't see it in the toolbox.

I just assumed you had to write everything from scratch, oh well.

I'll check the Microsoft Social Forum tonight

enhzflep13-Mar-12 16:58

enhzflep

13-Mar-12 16:58

Me too.

(implemented drag-n-drop file-opening once since it seemed easier than writing a file selection dialog)
It's quite easy to use though - much easier than trying to implement your own.
Unfortunately, the 'equivalent' function for selecting folders doesn't give such an intuitive, easy-to-use dialog. I seem to remember some kind of trick involving the lpfnHook and a filter that will exclude all files that aren't directories.

Re: c++ win32 Listview, File List, show folder and app icon using SHGetFileInfo

jkirkerx13-Mar-12 17:45

Well that took a couple of hours to figure out

13-Mar-12 17:45

It sounds like it's easier for me to just figure out the icon detail, and make the click events and functions. Poke tongue | ;-P

LOL!

I'm not that far away from completion, and besides, I can use the lesson for other listbox I have in the program. The multi-column thing is quite cool Suspicious | :suss:

however, and I would like to get to know it better.

Thanks for the post, at least one person has interest in it!

Appreciate the help! Thumbs Up | :thumbsup:

jkirkerx14-Mar-12 12:07

how to read flash drive type reader?

14-Mar-12 12:07

Worked on it for a couple of hours today. Documentation at MSDN is pretty vague, and got just 1 response off some post I made for help. Looks like SHGetFileInfo is very flexible in it's use, and can be used a dozen different ways.

I didn't see a pre-fabricated control or class in the toolbox, so I made this from scratch the hard way. So far so good.

If I'm completely off base here, just let me know. I might ditch the SHFILEINFO, I don't think I need it.

// Small Folder Icon
SHFILEINFOW	siFI_Small				= {0};	
HIMAGELIST	hSImageList				= {0};
	
hSImageList = (HIMAGELIST)SHGetFileInfo( L"Doesn't matter", FILE_ATTRIBUTE_DIRECTORY, &siFI_Small, sizeof( siFI_Small ), SHGFI_SYSICONINDEX | SHGFI_SMALLICON | SHGFI_USEFILEATTRIBUTES );
DeleteObject( siFI_Small.hIcon );

// Large Folder Icon
SHFILEINFOW	siFI_Large				= {0};
HIMAGELIST	hLImageList				= {0};
		
hLImageList = (HIMAGELIST)SHGetFileInfo( L"Doesn't matter", FILE_ATTRIBUTE_DIRECTORY, &siFI_Large, sizeof( siFI_Large ), SHGFI_SYSICONINDEX | SHGFI_SMALLICON | SHGFI_USEFILEATTRIBUTES );
DeleteObject( siFI_Large.hIcon );

It looks like any combination works when adding the folder icon, which is index 1 in the imagelist.

// Column 1 - Filename Icon
lv_ProjectOpen_Item_Record.iItem = dwIndex;
lv_ProjectOpen_Item_Record.iSubItem = 0;
lv_ProjectOpen_Item_Record.mask = LVIF_IMAGE;
lv_ProjectOpen_Item_Record.iImage = 1;
lv_ProjectOpen_Item_Record.cchTextMax = 254;
ListView_InsertItem( lv_ProjectOpen_FileSelect, &lv_ProjectOpen_Item_Record );

// Column 1 - Insert FileName Text
lv_ProjectOpen_Item_Record.mask = LVIF_TEXT;
lv_ProjectOpen_Item_Record.pszText = szFileName;
ListView_SetItem( lv_ProjectOpen_FileSelect, &lv_ProjectOpen_Item_Record);

Le@rner12-Mar-12 23:46

Le@rner

12-Mar-12 23:46

hi

any body help me or guide me from where i start to read flash drive type reader.

thanks.

Re: how to read flash drive type reader?

Richard MacCutchan13-Mar-12 0:47

Re: how to read flash drive type reader?

13-Mar-12 0:47

Try using Google[^] first.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

David Crow13-Mar-12 3:48

David Crow

13-Mar-12 3:48

Is the USB device mounted, and does it have a drive letter assigned to it?

documentation c++ gui

yahya7712-Mar-12 7:46

yahya77

12-Mar-12 7:46

please, some one give me documentation about c++ gui.

thinks

Maximilien12-Mar-12 7:59

Maximilien

12-Mar-12 7:59

Win32 ? MFC ? QT ? WinForms ?
Platform ? OS ?

User Interface Guideline[^] ?

Watched code never compiles.

yahya7712-Mar-12 8:25

yahya77

12-Mar-12 8:25

documentation about graphical user interface(winForms). ( my project in visual studio 2010 os:windows 7)

Richard MacCutchan12-Mar-12 8:00

12-Mar-12 8:00

What documentation are you talking about? If you want to write Windows programs in C++ then there are plenty of articles here on CodeProject and elsewhere that can help you. If you are looking for something else then please be more explicit about your problem.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

toolbar not being loaded for dialog dll---extension dll

CPallini12-Mar-12 22:58

CPallini

12-Mar-12 22:58

You already have Google, MSDN, CodeProject, etc...
Smile | :)

Veni, vidi, vici.

appollosputnik12-Mar-12 4:09

appollosputnik

12-Mar-12 4:09

i have created an extension dll. where i am loading a dialog from the client mfc application. My dialog has all menubar, toolbar, view. the dll dialog is being loaded but the toolbar is not coming. toolbar is there of the client mfc applications toolbar. My dll dialog toolbar is not being shown. any suggestions what could be the problem??? Thanks in advance

[code]
BOOL CDlgsViewDlg::OnInitDialog()
{
CDialog::OnInitDialog();

m_pNewView = new CMyView();
ShowWindow(SW_SHOWMAXIMIZED);
CRect clientRect;
GetClientRect(&clientRect);
clientRect.DeflateRect(10, 30);
// Creation of the view window
if(! m_pNewView->Create(NULL, NULL, WS_VISIBLE | WS_CHILD, clientRect,
this, WM_USER))
{
MessageBox(L"Failed to create view");
}

menu.LoadMenu(IDR_MAINFRAME1);
SetMenu(&menu);

if(!m_FirstToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD |
WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS |
CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_FirstToolBar.LoadToolBar(IDR_TOOLBAR1))
{
EndDialog(IDCANCEL);
}

RepositionBars(AFX_IDW_CONTROLBAR_FIRST, AFX_IDW_CONTROLBAR_LAST,0);

m_wndStatusBar.Create(this); //We create the status bar

m_wndStatusBar.SetIndicators(indicators,2); //Set the number of panes

CRect rect;
GetClientRect(&rect);
//Size the two panes
m_wndStatusBar.SetPaneInfo(0,ID_INDICATOR_NISH,
SBPS_NORMAL,rect.Width()-100);
m_wndStatusBar.SetPaneInfo(1,ID_INDICATOR_TIME,SBPS_STRETCH ,0);

//This is where we actually draw it on the screen
RepositionBars(AFX_IDW_CONTROLBAR_FIRST,AFX_IDW_CONTROLBAR_LAST,
ID_INDICATOR_TIME);

m_wndStatusBar.SetPaneText(0,L"MainWindow Initialized");

if(!fileName.IsEmpty()) {
m_pNewView->loadProfile(fileName);
m_pNewView->domainSetUpForProfile();
m_pNewView->drawLines();
m_pNewView->drawArcs();
m_pNewView->drawProfile();
m_pNewView->isModel=true;
m_pNewView->OnGeneratesurface();
m_pNewView->OnShade();
m_pNewView->OnIsosouthwest();
}

return TRUE; // return TRUE unless you set the focus to a control
}
[\code]
This is the OnInitDialog of my dll dialog where i am loading everything menubar, toolbar calliing some functions etc.
Please help

Re: toolbar not being loaded for dialog dll---extension dll

Richard MacCutchan12-Mar-12 8:03

Re: toolbar not being loaded for dialog dll---extension dll

12-Mar-12 8:03

This looks like a very complicated way to start a Windows application. Why not just use the standard Framework - View model that has been used since Windows first appeared?

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

appollosputnik12-Mar-12 21:24

appollosputnik

12-Mar-12 21:24

I want to call this dialog from another mfc application, it loads fine working properly. only the toolbar is not coming.

Re: toolbar not being loaded for dialog dll---extension dll

Richard MacCutchan12-Mar-12 23:25