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Great - glad I could help.
Christian
The tragedy of cyberspace - that so much can travel so far, and yet mean so little.
And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002
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Hello,
My visual studio just crashed on a compile and when I re-opened the project it says unable to load class information. class view information file could not be opened, or something like that.. How do I get the class view info back?
Thanks
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In your project folder, there is a file named *.clw (this is the class view file). Simply rename it to something like *_bak.clw (to have something backup). Then in your VC++ 6.0, press Ctrl+W, it will ask you whether should rebuild the class information. Answer yes and you'll get your class view back.
Good luck!
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I tried that first  and for some reason it still isn't loading the class info.. weird.. I'll do some more playing. If you can think of anything else please let me know.
Thanks
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have you added every file in your project to build the *.clw?
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do you have two copies of the same workspace open in two different VS instances?
-c
"Should you not have a ramekin of sea salt beside the stove, you don’t deserve oatmeal."
Dean Allen
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Are you referring to the tree view of the classes and methods, or the ClassView wizard. The .clw file is used by the wizard. I believe the one used for the explorer bar is .ncb.
Good Luck,
Bill
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This is one of the most annoying bugs in VC6. When the IDE crashes like this, it leaves MSDEV running. This means when you open the studio again it thinks there are two copies running, the crashed one still has the NCB file open. You'll have to close your open copy and then use task manager to kill the msdev.exe process. Then you should be able to reopen your project.
Michael 
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I have this app where i need to retrieve some settings from the registry, here's my code:
DWORD dwDisposition;
LPCTSTR SubKey = "SOFTWARE\\MP3Reader";
DWORD KeyLen = 0;
HKEY OpenKey;
DWORD DataType = REG_SZ;
DWORD DataLen;
char Data[MAX_PATH+1];
RegCreateKeyEx(HKEY_CURRENT_USER, SubKey, 0, NULL, 0, KEY_READ, NULL, &OpenKey, &dwDisposition);
if (dwDisposition == REG_OPENED_EXISTING_KEY)
{
RegEnumValue (OpenKey, 0, KeyValue, &KeyLen, NULL, &DataType, (unsigned char *)Data, &DataLen);
SetDlgItemText (hWnd, IDC_FILEPATH, (LPCTSTR)Data);
}
RegCloseKey (OpenKey);
<pre>
When it comes to the RegCloseKey sentence the following error appears:
Link: http:
I don't understand it cause the Registry handle (OpenKey) is used in RegEnumValue and there it works fine cuase it retrieves the value and fills up the Data variable with the correct data, but when it reaches to that specific sentence it doesen't work even though the variable hasn't been manipulated.
Thanks for the help!
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You first must to open the RegKey with RegOpenKeyEx. The last parameter will return you the Handle of the opened key, that you must to use in RegCloseKey 
Bets Regards
Carlos Antollini.
www.wanakostudios.com
Sonork ID 100.10529 cantollini
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The RegCreateKeyEx function will, if the registry key already exist, open the existing key and return it in the 8th parameter:
LONG RegCreateKeyEx(
HKEY hKey,
LPCTSTR lpSubKey,
DWORD Reserved,
LPTSTR lpClass,
DWORD dwOptions,
REGSAM samDesired,
LPSECURITY_ATTRIBUTES lpSecurityAttributes,
PHKEY phkResult,
LPDWORD lpdwDisposition
);
And i also tried it before where it worked, i don't know why it doesen't work now...
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Try checing the error codes on all the calls. Make sure they are returning 0s.
Good Luck,
Bill
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Check if RegCreateKeyEx returns ERROR_SUCCESS and close the key only if it is successful.
if (RegCreateKeyEx(...) == ERROR_SUCCESS)
{
// your code here
RegCloseKey(...);
}
Like it or not, I'm right.
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is there some mysterious unwritten law against inheriting INDIRECTLY from MFC classes?
i'm having all sorts of trouble trying to do something very simple. here is an example of my woe:
I'd like to create my own Wizard property sheet class, derived from CPropertySheet. ok, well- that's all fine and good, as long as I use the class that inherits directly from CPropertySheet. but try to add another layer, and forget it. will NOT compile.
same thing now happening with CPropertyPage. I'm trying to make a bunch of pages for my wizard, and they share common characteristics. seems like the textbook case of where to use a base class. I'd like to make my base class, WizardPage (or whatever) inherit from CPropertyPage. then all of my actual pages inherit from WizardPage.
no matter what i try, this will not compile. if i try to use one of the child classes, it says "base class undefined" or something. trust me, i included the right headers.
i would be forever grateful to anyone who can explain why this is happening.
~L
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There is nothing wrong with what you are trying to do. There is no limitation of inheritance from MFC classes or CPropertySheet.
Sorry, but the problem is in your code.
here is a sample:
[ccode]
// Derived.cpp: implementation of the CDerived class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "RegHelper.h"
#include "Derived.h"
#include "MyPropSheet.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CDerived::~CDerived()
{
}
CDerived::CDerived(UINT nIDCaption, CWnd* pParentWnd, UINT iSelectPage)
:CMyPropSheet(nIDCaption, pParentWnd, iSelectPage)
{
}
/////////////////////////////////////////////////////////////////////////////
// CMyPropSheet
class CMyPropSheet : public CPropertySheet
{
DECLARE_DYNAMIC(CMyPropSheet)
// Construction
public:
CMyPropSheet(UINT nIDCaption, CWnd* pParentWnd = NULL, UINT iSelectPage = 0);
CMyPropSheet(LPCTSTR pszCaption, CWnd* pParentWnd = NULL, UINT iSelectPage = 0);
// Attributes
public:
// Operations
public:
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMyPropSheet)
//}}AFX_VIRTUAL
// Implementation
public:
virtual ~CMyPropSheet();
// Generated message map functions
protected:
//{{AFX_MSG(CMyPropSheet)
// NOTE - the ClassWizard will add and remove member functions here.
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
[/ccode]
Hope this helps,
Bill
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thanx for the response. i did in fact find the problem not too long after i posted the question.
the main thing i've found is that you have to be really careful about the Class Wizard. it's helpful, but only up to a point. (like, up to the point where you add another level of inheritance to your class heirarchy- eg, if i were to make a class inherit from your CMyPropSheet)
anywyas, thanx again for taking hte time to help out.
~L (spoongirl)
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how to set radio button to be checked?
i want to checked radio button when user go to a menu bar, action menu, and choose menu item named check.
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Check out:
BOOL CheckDlgButton(
HWND hDlg, // handle to dialog box
int nIDButton, // button identifier
UINT uCheck // check state
);
or
void CWnd::CheckDlgButton( int nIDButton, UINT nCheck );
--------
CheckDlgButton(IDC_MY_RADIO_BTN, BST_CHECKED);
HTH,
-Wes
Sonork ID 100.14017 wtheronjones
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If you are using a CButton, use SetCheck(1) to check or SetCheck(0) to uncheck.
Like it or not, I'm right.
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You can use the BM_SETCHECK message:
SendMessage(
(HWND) hWnd,
BM_SETCHECK,
(WPARAM) wParam;
(LPARAM) lParam;
);
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I have created a dll in which I use the following linkage interface:
#ifdef CONSOLEDLL_EXPORTS
#define CONSOLEDLL_API __declspec(dllexport)
#else
#define CONSOLEDLL_API __declspec(dllimport)
#endif
every classes have been declared like this:
class CONSOLEDLL_API CCenteredStepEdger : public CStepObject{
friend CONSOLEDLL_API ostream& operator <<( ... );
friend CONSOLEDLL_API istream& operator >>( ... );
...
and some of the classes use fstream type variables:
fstream m_File;
when I compile the project, I have the following warning:
class 'fstream' needs to have dll-interface to be used by clients of class 'CCenteredStepEdger '
How should I specify the dll-interface for the fstream variables???
Thanks
Daniel Verret
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I'd like to know how I can find out if two drive letters refer to partitions on the same hard drive.
I'm working on a database backup utility, & I want to discourage users from selecting the same physical hard drive for their backups as the hard drive where their 'live database' is running.
ie: If "C:\LiveDatabases" and "D:\My Backups" are actually located on the same physical harddrive(on different partitions), I'd like to know how to determine this info.
Thanks!
Wes
Sonork ID 100.14017 wtheronjones
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Try checking out this site: http://www.users.intercom.com/~ranish/part/primer.htm
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Thanks for the informative link, but I'm looking for API's that I'd be able to use to figure this out.
Thanks!
-Wes
Sonork ID 100.14017 wtheronjones
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