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I asked this question the other day but didn't quite get the response I was looking for...
I'm thinking the formula isn't rocket science cuz I think I almost figured it out (I don't even have a gr. 10) so hopefully someone witha degree in something science out there can help me... 
I hate math BTW 
The thumb sizes of scroll bars...for proportional scroll bars...how are they calculated...???
They way I see it you have 2 variables to work with...
the scroll range or amount of total (virtual) window and the visible client area....using these two variables what formula would return the proper proprtional thumb size...
This is totally confusing me...
please help
Thanx!
"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr
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You got it right!
ThumbSize = (ClientSize/WindowSize)*ClientSize
or
ThumbSize = ClientSize^2/WindowSize
and
WindowSize >= ClientSize
Example: Window = 400, Client = 100
Thumb = 25 (1/4 of ClientSize, right!) 
ÿVOTD: 8 "Love never fails. But where there are prophecies, they will cease;
where there are tongues, they will be stilled; where there is knowledge, it will pass away." - 1 Cor 13:8 (NIV)
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Thank you kindly...
You have no idea how much I appreciate this help..I don't think i've ever benn so stumped in my life...
Once again I thank...
cheers!
"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr
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[UPDATE - I think instead of multiplying client you multiply by virtual...I think returns proper values now]
One question I forgot to ask...
What happens if the variables work like this?
Client area = 200;
Virtual window = 400;
This would require 50% thumb size right...?
but according to your formula
(200 / 400) * 200 would yield 100 if my math is correct...which is incorrect...a gives a false feedback to the user who expects 25% more scroll range.
Am I wrong here...? I'm very confued now... 
Thanx again
cheers
"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr
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100px is 50% of your client area (200px) so the math is correct. You didnt mention that you need the value as a percent value.
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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How do I update vars. declared in a Document from a Dialog? I would like to be able to get a pointer to my Document from w/in my Dialog. I'm using the CMyDoc *pDoc = GetDocument() statement in the Dialog class, but the compiler issues an 'undeclared identifier' message. I'd also like to go the other way, ie, pick data from the Document with which to initialize the Dialog. That's why I'm trying to setup a pointer to my Document from my Dialog. Thx,
Ralf.
ralf.riedel@usm.edu
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do it like this:
void CMyDoc::FunctionThatLaunchesTheDialog()
{
CMyDialog theDlg;
theDlg.m_variableOne = m_something;
theDlg.m_variableTwo = m_somethingElse;
if (theDlg.DoModal() == IDOK)
{
m_something = theDlg.m_variableOne;
m_somethingElse = theDlg.m_variableTwo;
}
}
your dialogs should almost never have to know about your document class.
-c
A man is like a rusty wheel on a rusty cart,
He sings his song as he rattles along and then he falls apart.
-- Richard Thompson
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Hello, the codegurus around the world.;)
Basically, we don't need to create CMyDialog in MyDoc class.
(Or, maybe we call some member function of CMyDoc with createing MyDialog and
call this function in the menu associated in CMyView).
Anyway, there are at least two ways to access the member value of CMyDoc.
1) Pass the parent's CWnd through the dialog class constructor.
(Or use GetParent() function of CWnd).
So, what is the parent? CMyDoc(?), CMyview or CMyFrame. No problems.
(Oops, CMyDoc will not be derived from CWnd.)
2) Use the global functions like AfxGetApp() or AfxGetMainWnd()
to get CMyFrame's CWnd and use GetDocument() functions.
So, we can enjoy MFC since we have many ways to do anything.
Please, don't send me your email about your questions directly.
Have a nice day!
Sonork - 100.10571:vcdeveloper 
-Masaaki Onishi-
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I store all my data in the CDocument derived class ( including the data for the dialog) and pass a pointer to it into the dialog itself.
This is a very neat way of doing things. All you have to do then is DoModal() and there is no more passing data between the classes.
Using this method helped me finally understand pointers.
e.g. in my View I handle the Options menu item. The handler will show the COptionsDlg dialog.
// in the View class I handle the Options menu handler
void CMyView::OnOptions()
{
COptionsDlg dlg;
dlg.SetupDocument(GetDocument());
if (dlg.DoModal()==IDOK)
GetDocument()->SetModifiedFlag();
}
//Add a SetupDocument member fn to COptionsDlg
//This function stores the CMyDoc pointer argument in a member variable
//
void COptionsDlg::SetupDocument(CMyDoc* pDoc)
{
m_pDoc=pDoc; //m_pDoc is declared in OptionsDlg.h as CMyDoc* m_pDoc
//remember to #include "MyDoc.h" there too
}
// in the COptionsDlg, link Edit boxes with the data members of the
// CDocument dervied class using DDX
void COptionsDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(COptionsDlg)
DDX_Text(pDX, IDC_EDIT1,m_pDoc->m_iOption1);
DDX_Text(pDX, IDC_EDIT2,m_pDoc->m_iOption2);
//}}AFX_DATA_MAP
}
When you click on OK, the framework's OnOK()function calls UpdateData(true) so the edit box values are stored in the CMyDoc members.
if you want the full source for this example email me on john@wmgallery.co.uk
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I've noticed similar questions in other threads where people have recommended not DDXing to the CDocument inherited class directly as the Dialog shouldn't care about the Document. I don't agree with this.
One of the main reasons for the Document/View pattern is to maintain a single copy of the Document data throughout the application. This is exactly what my method(above) does - it passes a pointer to the single Document object between classes. The Dialog is as valid a 'view' as the View.
Coping data into members belonging to other objects and them reading from the members again opens the way for bugs and makes things more rigid.
That's what I reckon anyways
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I have this timer that sets some buttons but it doesn't take place in the dialog window until I click the button or if I have a break in the code when I come out.
void CStatus::OnTimer(UINT nIDEvent)
{
if(nIDEvent == 3153)
{
UpdateData(true);
m_153_tti_enab.m_MouseOnButton = true;
m_153_tti_inhbt.m_MouseOnButton = true;
m_153_min_inhbt.m_MouseOnButton = true;
m_153_test.m_MouseOnButton = true;
m_153_malf.m_MouseOnButton = true;
m_153_rt.m_MouseOnButton = true;
UpdateData(false);
}
Any ideas as to why this won't update the window?
Thanks for all the help!!!
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Try forcing the window to repaint itself with Invalidate(FALSE); after the UpdateData call.
Christian
We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )
Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002
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The Invalidate() does cause the window to update...GOOD. but it blinks really bad. Any easy way to smooth this out?
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Invalidate(FALSE) should cause the window to redraw itself WITHOUT erasing first, and should therefore not flicker. Beyond that, my MFC is a little rusty, I'm sorry. Is your WM_PAINT message doing anything strange ?
Christian
We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )
Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002
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Is the application busy?
And what is ...m_MouseOnButton?
What is it expected to do?
Give a little more insight to your app.
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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The app isn't busy...m_MouseOnButton is a way of setting the button to the active state. So what I'm doing is reading in some values and if they are true then I set the button on and hope it updates on the page by changing color.
Thanks for the help.
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jimNLX wrote:
if they are true then I set the button on and hope it updates
Hope is the last to die, people say.
How exactly are you setting the button on? Where does it happen? When?
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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enab.m_MouseOnButton = true; this is how I set the button state to on and I do this in OnTimer()
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Sorry, where does the button actually react on the flag? is it a check button? and the variable is DDX'd to it?
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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I'm using CButtonST (from this board) and subclass this in OnInit then OnTimer reads a flag and sets
OnInit code:
m_jam.SubclassDlgItem(IDC_JAM,this);
m_jam.SetTooltipText(IDS_TRNFREEZE);
m_jam.SetActiveBgColor(COLOR_ORANGE);
OnTimer code:
m_jam.m_MouseOnButton = true;
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Did you try using a standard button instead? If it works with the standard button I would say its a bug in the CButtonST class.
btw: your call to UpdateData(true) isnt needed at all as far as I see from your code.
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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If I run it w/o breakpoints, it puts up three CFIleDialogs like it should, but then crashes - memory could not be read.
If I try to debug it with a breakpoint, it says its an NTDLL first chance exception - invalid handle. and never even puts up the three dialogs! I can put the breakpoint anywhere even quite early and I stil ge this. In the call stack I havent gone very far when it happens. I'm troubled that a direct run, and a breakpoint debug run arent following the same route? Although The three CFILEDLgs are postmessage triggered, so maybe thats significant?
Helppp!
ns
Weirder yet, after the three fldialogs get their inputs they save then to the registry. and then crashes. But if you run the program again after these keys have been created, it runs just fine!!
SO its a crash about an invalid handle but doesnt allow the filedlgs to popup like they do when the program is run without debug mode.
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And the code ?
Is the program single threaded ? What are you storing in the registry ? How does your programs execution path differ once those keys exist ?
Christian
We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )
Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002
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void CTrain1View::QueryRegistry()
{
CString dbName;
HKEY keyHandle1, keyHandle2, keyHandle3;
CString str;
;
DWORD valSize = sizeof(DWORD);
RegOpenKeyEx(HKEY_CURRENT_USER, "Software",
0, KEY_ALL_ACCESS, &keyHandle1);
LONG res = RegOpenKeyEx(keyHandle1, "MyCompany4",
0, KEY_ALL_ACCESS, &keyHandle2);
RegOpenKeyEx(keyHandle2, "MyApplication4",
0, KEY_ALL_ACCESS, &keyHandle3);
DWORD size=128;
DWORD type = REG_SZ;
LPSTR psz = dbName.GetBuffer(size);
LONG result = RegQueryValueEx( keyHandle3,"Database Name",0,&type,(LPBYTE)psz,&size );
dbName.ReleaseBuffer();
size=128;
LPSTR psz1 = m_PhotoDBPath.GetBuffer(size);
result = RegQueryValueEx( keyHandle3,"Photo Database Name",0,&type,(LPBYTE)psz1,&size );
m_PhotoDBPath.ReleaseBuffer();
size=128;
LPSTR psz2 = m_ImageFolderLoc.GetBuffer(size);
result = RegQueryValueEx( keyHandle3,"Image Folder Location",0,&type,(LPBYTE)psz2,&size );
m_ImageFolderLoc.ReleaseBuffer();
gImageFolderLoc = m_ImageFolderLoc;
RegCloseKey(keyHandle1);
RegCloseKey(keyHandle2);
RegCloseKey(keyHandle3);
if (result == ERROR_SUCCESS)
{
gDatabaseName=dbName;
CString filename = DatabaseName(dbName);
GetStuff(dbName );
InitDisplay();
}
if ( dbName =="")
{
PostMessage(WM_COMMAND, ID_SELECTDATABASE);
}
}
and the postmessage is handled as:
CFileDialog fileDlg(TRUE, NULL, NULL, OFN_HIDEREADONLY|OFN_FILEMUSTEXIST, "Database Files(*.mdb)|*.mdb||",NULL);
fileDlg.m_ofn.lpstrTitle = "Open Database";
if ( fileDlg.DoModal() == IDOK)
{
m_szlstfile = fileDlg.GetPathName();
CString fileExt = fileDlg.GetFileExt();
if(fileExt != "MDB" && fileExt != "mdb" )
{
m_badfilename=TRUE;
AfxMessageBox ("The file selected is not a database file");
imageMap.clear();
InitDisplay();
return;
}
m_listdisplay.DeleteAllItems();
CFileDialog fileDlg(TRUE, NULL, NULL, OFN_HIDEREADONLY|OFN_FILEMUSTEXIST, "Database Files(*.mdb)|*.mdb||",NULL);
fileDlg.m_ofn.lpstrTitle = "Select Database For Photographs";
int nRetPhoto = fileDlg.DoModal();
if ( nRetPhoto == IDOK)
{
m_PhotoDBPath = fileDlg.GetPathName();
CString fileExt = fileDlg.GetFileExt();
if(fileExt != "MDB" && fileExt != "mdb" )
{
AfxMessageBox ("The file selected is not a database file. No record added");
return;
}
}
CFileDialogST dlg;
int nRetValue;
CString sFolder;
nRetValue = dlg.SelectFolder(_T("Please select the Image folder"), _T("c:\\"), 0x40|BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS, this);
if (nRetValue == IDOK)
{
m_ImageFolderLoc = dlg.GetSelectedFolder();
gImageFolderLoc = m_ImageFolderLoc;
MessageBox(m_ImageFolderLoc, _T("GetSelectedFolder"), MB_ICONINFORMATION);
}
HKEY keyHandle1, keyHandle2, keyHandle3;
CString str;
DWORD disp;
RegOpenKeyEx(HKEY_CURRENT_USER, "Software",
0, KEY_ALL_ACCESS, &keyHandle1);
RegCreateKeyEx(keyHandle1, "MyCompany4", 0, "",
REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
&keyHandle2, &disp);
RegCreateKeyEx(keyHandle2, "MyApplication4", 0, "",
REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
&keyHandle3, &disp);
DWORD type = REG_SZ;
DWORD size = m_szlstfile.GetLength();
LONG result = RegSetValueEx( keyHandle3,"Database Name",0,type,(LPBYTE)LPCSTR(m_szlstfile),size );
size = m_PhotoDBPath.GetLength();
result = RegSetValueEx( keyHandle3,"Photo Database Name",0,type,(LPBYTE)LPCSTR(m_PhotoDBPath),size );
size = m_ImageFolderLoc.GetLength();
result = RegSetValueEx( keyHandle3,"Image Folder Location",0,type,(LPBYTE)LPCSTR(m_ImageFolderLoc),size );
if (result != ERROR_SUCCESS)
AfxMessageBox("Registry error");
RegCloseKey(keyHandle1);
RegCloseKey(keyHandle2);
RegCloseKey(keyHandle3);
gDatabaseName = m_szlstfile;
if (pDoc->m_db.IsOpen()) pDoc->m_db.Close();
GetStuff(m_szlstfile );
InitDisplay();
I have two CFiledlgs with the same name, but even making them distinct doesnt help.
Thanks for helping!
ns
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Seems that its really what I suggested: you dont check the return values from the first RegOpenKey(...) calls. They will definitly fail and thus you have a invalid handle in keyHandle1, so the next call to RegOpenKey() to open the MyCompany key will fail and throw your exception.
Always check for return values - even if you are sure it will succeed (which it doesnt in your case).
int x=1, y=5;
x^=y^=x^=y;
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>
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