C / C++ / MFC Discussion Boards

Re: User breakpoint when trying to free memory.

Daniel Turini23-Oct-02 9:57

Daniel Turini

23-Oct-02 9:57

A buffer overrun...

change to this:

char *szFirstPart = new char[strlen(szSourceString) + 1];

Q261186 - Computer Randomly Plays Classical Music

Re: User breakpoint when trying to free memory.

Stephane Rodriguez.23-Oct-02 10:14

Stephane Rodriguez.

23-Oct-02 10:14

Anonymous wrote:
char *szFirstPart = new char[strlen(szSourceString)];

char *szFirstPart = new char[strlen(szSourceString)+1]; // + 1 for the EOL char

Then take that char into account everywhere, for instance :
memset(szFirstPart, 0, strlen(szSourceString));
becomes
memset(szFirstPart, 0, strlen(szSourceString)+1);

How low can you go ?
(MS rant)

MFC doc/view issue

will138323-Oct-02 9:38

will1383

23-Oct-02 9:38

I all,

I'm attempting to write an application using the doc/view arch. and I'm not sure how to do the following:

I want to have multiple views of a single document (read, different views using different dialogs and the like). A similar way to look at it would be the windows explorer. 2 very different views of the same data. That is in essence what I want to do, but each view has its own dialog box and set of functions associated with it. They are implemented as seperate dlls since they are used in many other applications.

Can I do this by setting up the splitters correctly?
What do I have to do to display these other dialog boxes within that particular view?

Any suggestions are greatly appreciated, even if it is another way of approaching the manner. I am using toolbars and rebars extensively and thought the doc/view approach would be the way to go.

Thank you in advance. This could be a complicated matter (it is to me!)

Dan

Re: MFC doc/view issue

valikac23-Oct-02 18:08

valikac

23-Oct-02 18:08

Yes, it is possible to implement multiple views of a single document and it can be done with a splitter frame.

The simplest solution for multiple concurrent dialog boxes is modeless style over modal style. Otherwise, consider a propertysheet.

Kuphryn

How to change the background of a CHotkeyCtrl ?

CAE23-Oct-02 9:12

CAE

23-Oct-02 9:12

Hi,

I can override WM_ERASEBKGND and fill the control but it is valid only when the control has not the focus. If it gains focus, the text is drawn with a background system color (COLOR_WINDOW), WM_CTLCOLOR is not called.

Any idea ?

Nicolas

Re: How to change the background of a CHotkeyCtrl ?

Mike Nordell24-Oct-02 4:09

Mike Nordell

24-Oct-02 4:09

Any idea ?

Spy++ ?

html help workshop question

Anonymous23-Oct-02 8:48

Anonymous

23-Oct-02 8:48

I dont know where to post this. My MFC app has a HElp Menu item> i want to launch the tripane help window from this button. My HTMLHELP workshop book tells me how to make a help project so I am assuming that I have the .chm file. Now I need to know how to launch this using the HTMLHelp API.....

Re: html help workshop question

Dominik Reichl23-Oct-02 9:15

Dominik Reichl

23-Oct-02 9:15

You can use the ShellExecute function:

HINSTANCE ShellExecute(
HWND hwnd,
LPCTSTR lpOperation,
LPCTSTR lpFile,
LPCTSTR lpParameters,
LPCTSTR lpDirectory,
INT nShowCmd
);

As operation you specify "open", as file your .chm file.

Big Grin | :-D

-Dominik

How do i replace a specific string inside a char array with another string?

Anonymous23-Oct-02 8:28

Anonymous

23-Oct-02 8:28

thanks

Re: How do i replace a specific string inside a char array with another string?

Mel Feik23-Oct-02 8:36

Mel Feik

23-Oct-02 8:36

try using the remove(), replace(), insert() members of CString

---------------------------------------------

Be good! But if you can't be good, at least be good at it and try not to get any on ya!

-mjf

Re: How do i replace a specific string inside a char array with another string?

Anonymous23-Oct-02 8:39

Anonymous

23-Oct-02 8:39

How do i use them on a char array?

Re: How do i replace a specific string inside a char array with another string?

Mel Feik23-Oct-02 9:01

Mel Feik

23-Oct-02 9:01

You can't directly (not that I'm aware of anyways. However, one way would be to declare a CString and set it to your char array (CString str = charArray;) and them use the CString members mentioned earlier, are you could use the <string.h> functions such as strcat(), strcpy(), etc... Personally I prefer working with the CString as that wrapper class seems more flexible to me (or maybe its just cause I'm used to it). Either way would work fine and of course, you could also just use pointers and remove/replace in your char array as you like.

---------------------------------------------

Be good! But if you can't be good, at least be good at it and try not to get any on ya!

-mjf

Splash screen

MFC is the Best23-Oct-02 8:01

MFC is the Best

23-Oct-02 8:01

hello!

i have a splash screen (greeting screen) in my mfc-programm. how can i change the time?(i would like to see the picture longer.)

thanks

MFC

Re: Splash screen

jmkhael23-Oct-02 8:03

jmkhael

23-Oct-02 8:03

search in your code for SetTimer

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Splash screen

MFC is the Best23-Oct-02 8:08

MFC is the Best

23-Oct-02 8:08

thank you very much

linking libs in...

l a u r e n23-Oct-02 7:39

l a u r e n

23-Oct-02 7:39

hello

i use static linking when i build my app but i had a tester tell me that on an old w95 machine the app couldnt load cos it was missing ws2_32.dll ... now i thought first off that static linking would put that in there but apparently not

can i distribute the ws2_32.dll as part of the installer without stuffing up old machines like that one?

thanks

"even if my world is weird it's my world"
biz stuff about me

Re: linking libs in...

Stephane Rodriguez.23-Oct-02 7:43

Stephane Rodriguez.

23-Oct-02 7:43

MS Redistribution package for W95[^]. (not needed on W98).

How low can you go ?
(MS rant)

Re: linking libs in...

l a u r e n23-Oct-02 7:51

l a u r e n

23-Oct-02 7:51

thanks stephane
Smile | :)

"even if my world is weird it's my world"
biz stuff about me

My dialog based app. don't run on another machine (ActiveX???)

whofmans23-Oct-02 7:37

whofmans

23-Oct-02 7:37

Hi,

My dialog based application don't run on another machine. In my dialog i have used the ActiveX component "Microsoft Forms 2.0 Textbox". I think that that is the problem. How can i code something to automaticly install this ActiveX comp. on a computer?

Please help me or give me a URL..

Thanks

Re: My dialog based app. don't run on another machine (ActiveX???)

Stephane Rodriguez.23-Oct-02 7:53

Stephane Rodriguez.

23-Oct-02 7:53

This component is part of <winsysdir>\FM20.dll. Check out MSDN for further info about redistributing this stuff.

How low can you go ?
(MS rant)

MFC ON_CBN_EDITCHANGE message handler never called!

Daniel Strigl23-Oct-02 7:35

Daniel Strigl

23-Oct-02 7:35

I have created a combo box control in a command bar control with the following code:

// Add a combo box control to the first command bar
::CommandBar_InsertComboBox(hBar, hInst, 120 /* = iWidth */, CBS_DROPDOWNLIST /*| WS_DISABLED*/, ID_ROOMS_COMBO, sizeof(g_arCmdbarRoomsButtons) / sizeof(TBBUTTON) /* = iButton */);

To get a message when the user change the selected item of the combo box control I added the following message handler to my CMainFrame class:

...
ON_CBN_EDITCHANGE(ID_ROOMS_COMBO, OnEditChangeRoomsCombo)
...
void CMainFrame::OnEditChangeRoomsCombo() 
{
    ...
}
...

So, the problem is that when the user change the selected item of the combo box control, this message handler will never called by the system!

(I work with eMbedded VC++ 3.0 and WinCE 3.0, but I think it is a simple MFC problem - a problem that I implemented something wrong).

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: MFC ON_CBN_EDITCHANGE message handler never called!

valikac23-Oct-02 7:58

valikac

23-Oct-02 7:58

MFC framework does not send ON_CBN_EDITCHANGE message if the combobox contains the CBS_DROPDOWNLIST style.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_MFC_CComboBox.asp

Kuphryn

Re: MFC ON_CBN_EDITCHANGE message handler never called!

Daniel Strigl23-Oct-02 19:59

Daniel Strigl

23-Oct-02 19:59

Thanks! It works! Smile | :)

Daniel

---------------------------
Never change a running system!

ANSI --> UNICODE conversion problem!

Daniel Strigl23-Oct-02 7:26

Daniel Strigl

23-Oct-02 7:26

I read some simple chars (1 byte wide) from a file and want to build a string, based on this simple chars.

Sample:

Read 'B'
Read 'ü'
Read 'r'
Read 'o'
--> string: "Büro"

I use the following code:

while (TRUE)
{
    char c = 0;

    // Read character from file

    DWORD dwReadBytes;
        
    if (!ReadFile(m_hFile, &c, sizeof(char), &dwReadBytes, NULL) || 
        dwReadBytes != (DWORD) sizeof(char))
    {
        ErrorMessage(_T("Unerwartetes Dateiende (EOF) in Zeile %d."), m_nCurrentLine); 
	
        return FALSE;
    }

    // Find carriage return?

    if (c == '\n')
    {
        break;
    }

    // Add character to string

    str += CString((TCHAR) c);
}

The problem is the line str += CString((TCHAR) c);.
My system (PocketPC) works with UNICODE and so I have to convert the readed char to a UNICODE char.
I have used TCHAR that I can use the source code on both systems (UNICODE & non UNICODE).

So, the problem is now that when I read some chars like ö. ä, ü, ... the conersion result is a "?".
So, when I should read the string "Büro" the result is "B?ro". It look like, that the conversion failed!

How can I fix that?

Daniel
---------------------------
Never change a running system!

Re: ANSI --> UNICODE conversion problem!

l a u r e n23-Oct-02 7:41

l a u r e n

23-Oct-02 7:41

check out the USES_CONVERSION; macro in msdn and W2A() and A2W()
Smile | :)

"even if my world is weird it's my world"
biz stuff about me

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