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I assume that valid null terminated strings are passed to the functions and that cch is the length (not including the ending NULL) of the original string (0 means compute) and szLen is the buffer size of the output including the room for the NULL terminator.
In such case, then if cch is greater or equal to szLen, psz[cch] will write one character after the end of the buffer (it should be psz[cch-1]).
Also the alternate code is wrong. The reason why it will often works is because szLen is greater that 4 in your case. Doing a sizeof on the returned size return the size of a variable of type size_t (which is probably an unsigned int or an unsigned long) and not the value hold in the variable.
Note that you uses assertion in your code to validate what you are doing. For ex. adding ASSERT(strlen(psz) < szLen) would have typically catch the error after the memory is overwritten but before the application crash so it would then be easy to apply the fix!
You should also check the result of the call to WideCharToMultiByte. If it fails (and it can), the output will contains garbage (if it wasn't initialized externally).
Also if output is really multibyte, then some UNICODE characters may be converted to 2 multibyte characters and it that case, the code would be incorrect.
Finally, it may be easier (and less error-prone) to uses macros like W2A (or classes like _bstr_t, CString, CComBSTR,...) to make conversions if you do not needs the extra functionality accessible only from the API.
In a few words: length and size are different... Knows what you are doing. Also, you may allocate a bit more memory than necessary to be on the safe side.
Philippe Mori
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I salute you all,
I am new on MFC and right now i am trying to make a Microsoft's paint again.
My question is; Toolbox used in that program is CReBar object or CToolBar object? If CToolBar object how can i make two column toolbar.
Thank you.
I salute you all,
I am new on MFC and right now i am trying to make a Microsoft's paint again.
My question is; Toolbox used in that program is CReBar object or CToolBar object? If CToolBar object how can i make two column toolbar.
Thank you.
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AFAIK, it uses a custom control within a control bar. You can find out for sure using Spy++ if you like. If you want to make a two column toolbar, i think you can just set the TBSTYLE_WRAPABLE style and set the width large enough for two buttons.
Developers that like shiny objects also dig case mods and scratch-and-sniff stickers. Klaus Probst, The Lounge
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Is there a way to check if a file exist??
I'm using ::GetPrivateProfileXXX(...) funktion and if the file doesn't exist my app crashes... so I need a way to check if my INI exist!
------------------------------------
Rickard Andersson, Suza Computing
ICQ#: 50302279
I'm from the winter country SWEDEN!
------------------------------------
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If you are using MFC you can use CFile like so..
if (f.Open(filename, CFile::modeRead) == TRUE) {
Otherwise you could do something similar with fopen() and check for NULL
-Jack
To an optimist the glass is half full.
To a pessimist the glass is half empty.
To a programmer the glass is twice as big as it needs to be.
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#include <io.h>
...
if(_access(filename,0)==0){
}
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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FILE *fp = fopen("C:\\file.txt", "r");
if (!fp)
}
//... no file
{
else
{
//... there is a file
fclose(fp);
}
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Also for information there is a simple way to check if a file is writable or not:
FILE *f = fopen(filename, "ab");
if (!f)
{
}
else
{
fclose(f);
}
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My dialog is returning 20.. I can't figure out what this means.. anyone know?
The thread 0x1E0 has exited with code 20 (0x14)
Thanks,
Jim Beam
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Who's returning 20? a dialog or a thread?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Joaquín M López Muñoz wrote:
Who's returning 20? a dialog or a thread?
That is my dialog's thread.. it was returning 2 (IDCANCEL) a while back.. now all of a sudden it is returning 20.
Thanks,
Jim Beam
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Nevermind.. I see that the thread can exit with a different value than the dialog.
Sorry,
Jim Beam
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I was wonderng, is there any way to use MFC Controls in a CDHtmlDialog?
Currently, I have a rather attractive looking GUI which is a modified off of a design I got from am "open source web design" website, which I have modded up with some javascript/etc for the purposes of my program.
However, I would like to have a list control in the lower portion of my screen.
a screenshot can be found --> http://24.150.11.236/gui1.png
what I would like, is to have a MFC Control in where I have ---List Control would go here---
(the design I modified to use http://www.oswd.org/viewdesign.phtml?id=559&referer=%2Fbrowse.phtml%3Fcategory%3Dclean%26offset%3D35%26sort%3Dposted_date%26min_rating%3D3 )
Currently, the only thing I can think of doing, is making a CDHTMLView type class, and using splitters and having the top be the HTML, with just a straight up MFC List control in the bottom half, but I'd much rather find a way to imbed it into the page itself.
any ideas?
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create an ActiveX control that contains a list ctrl. embed that on your page.
-c
A man usually falls in love with a woman who asks the kinds of questions he is able to answer.
Ronald Colman
Smaller Animals Software, Inc.
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I'll have to double-check this when i get home, but doesn't CDHtmlDialog use both an old-style dialog template and a HTML dialog template? What happens when you put the list control on the normal template?
Developers that like shiny objects also dig case mods and scratch-and-sniff stickers. Klaus Probst, The Lounge
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I got thinking of that after I posted this so I tried it, and the control displays ontop of the HTML, which gives me the desired effect I want.
Now just the matter of being able to move/re-size it as needed to keep it in position.
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Hi!
I try to place or remove my MFC program's button in the system tray by using:
ModifyStyleEx(WS_EX_APPWINDOW, WS_EX_TOOLWINDOW);
or vice versa. When I place this statement in OnInitDialog, everything works fine. But when I place it somewhere else so that I can do the change "on runtime", nothing happens. Well, the Icon on the button in the system tray does vanish / reappear depending on the setting, and GetExStyle() shows that the settings have changed - but that's it. Any ideas, or do I have to give it up?
Thanks,
Martin
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radix wrote:
I try to place or remove my MFC program's button in the system tray
You mean the taskbar icon? 
Check out Nish's article "Some handy dialog box tricks" (or something like that )
I don't know where to find it and have no time to get the URL for ya, but search here on CP or perhaps Nish himself can tell ya!
------------------------------------
Rickard Andersson, Suza Computing
ICQ#: 50302279
I'm from the winter country SWEDEN!
------------------------------------
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Rickard Andersson wrote:
You mean the taskbar icon?
No - I meant the icon in the button on the taskbar;)
I checked Nish's article, but even though it's pretty good it didn't solve my problem, as he did the removing of the button in OnInitDialog...
Martin
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Hi,
Is there a way to draw a bitmap in the background of a richedit?
I tried to override WM_ERASEBACKGROUND, but it does nothing.
I read that we can put the WS_EX_TRANSPARENT style and draw on the main window, but I want to do all the drawing in my derived CRichEditCtrl.
How can I do?
thanks,
John
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Try WM_DRAWITEM
------------------------------------
Rickard Andersson, Suza Computing
ICQ#: 50302279
I'm from the winter country SWEDEN!
------------------------------------
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In fact I added the WS_EX_TRANSPARENT style to the richedit, and since the background is now transparent, I override WM_ERASEBKGD message to draw my bitmap.
The only problem I have is a flickering problem while sizing the window, because since the richedit is transparent, before I draw its background, the main dialog repaints itself under it.
Does anyone know how I can avoid it?
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Has anyone out there created an OLE script for PCAnywhere? I would like to speak with you if possible. My number is: (909) 585-8445
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:: Sadly, Barry starts receiving a plethora of phone calls from telemarketers. If only he hadn't posted his phone number in a public forum. Tisk Tisk ::
Jeremy L. Falcon
"The One Who Said, 'The One Who Said...'"
<nobr>
Homepage : Feature Article : Sonork = 100.16311
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