C / C++ / MFC Discussion Boards

C^hris L^osinger27-Aug-02 10:35

27-Aug-02 10:35

Anonymous wrote:
Are there any benefits to using VS and MFC over an actual RAD enviroment?

MFC looks good on your resume.

-c

Aiei i ea eio aoa i e eio e aigoa

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Re: Is MFC really as bad as it seems?

pankajdaga27-Aug-02 11:30

pankajdaga

27-Aug-02 11:30

Hi,

Yeah, it definitely looks good on your resume and is a must-have. However, having said that I am not a big fan of MFC myself. It really bloats up the software and makes it sluggish. However, companies use it and you are left with no choice. In my personal projects, I make wrapper classes around the WIN API.

Relisoftis a good resource if you want to learn about programming for windows without the use of MFC. Even if you use MFC, it is a site worth looking at. I am not saying, do not use MFC at all. But it sure is a good learning experience, if you know your way around WIN32 API.

My 2 cents Smile | :)

Pankaj

Without struggle, there is no progress

Re: Is MFC really as bad as it seems?

Michael P Butler27-Aug-02 22:50

Michael P Butler

27-Aug-02 22:50

VS and MFC aren't exactly the best RAD tools available, but I find they have more power and flexibility than Borlands offerings. It depends on what you are trying to develop. MFC is great for building large applications, but you do need to know how and why things work in it.

I love MFC, but it is starting to show its age but for nearly 10 years it has allowed me to develop lots of Windows applications quickly (if not always easily)

Michael Smile | :)

Time flies like an arrow. Fruit flies like a banana

time string? newbie

Anonymous27-Aug-02 10:18

Anonymous

27-Aug-02 10:18

Hello, where do I get my hour/minute from the computer?
CString mydate;
mydate.Format("%d:%d", xxx );

Re: time string? newbie

fiznicker27-Aug-02 10:25

fiznicker

27-Aug-02 10:25

Assuming you can use native Win32, see:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/time_functions.asp

Not sure how MFC does things.

Re: time string? newbie

Tomasz Sowinski27-Aug-02 10:39

Tomasz Sowinski

27-Aug-02 10:39

Check CTime::Format and COleDateTime::Format.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Re: time string? newbie

Ravi Bhavnani27-Aug-02 10:41

Ravi Bhavnani

27-Aug-02 10:41

See CTime.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: time string? newbie

jmkhael27-Aug-02 10:42

jmkhael

27-Aug-02 10:42

one class :

CTime

usefull member function: Format

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: time string? newbie

valikac27-Aug-02 15:08

valikac

27-Aug-02 15:08

Using MFC, you could use the CTime class.

Kuphryn

Re: time string? newbie

Michael Dunn27-Aug-02 16:52

Michael Dunn

27-Aug-02 16:52

If you need the current time, call CTime::GetCurrentTime()

--Mike--
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Tracking source of Invalid Page Fault

fiznicker27-Aug-02 10:15

fiznicker

27-Aug-02 10:15

Hello and thanks in advance for your help.
I've got an app that's been released into production for a couple years now. Recently I've had reports of an IPF occurring at 01F:004013AB. I have not been able to reproduce this error in my testing environment.

I have tried to set a breakpoint at this memory address, but the IDE shows an error. I've noticed a few things - one is that the memory address maps to different code locations depending on wether I'm running a beta or release version in the IDE. So I've been trying to break at the memory location when in release configuration and checking the disassembly - with no luck. The other thing I've noticed is that this is a very early memory location, seeing that windows loads apps at 00400000.

Does anyone have any insight into this? I'm wondering a few things: is that memory address (004013ab) comparible across OS'es? Is it comparible across machines? Is there a way to figure out what is causing the error without debugging on a machine that is causing the error?

Re: Tracking source of Invalid Page Fault

Andreas Saurwein27-Aug-02 13:03

Andreas Saurwein

27-Aug-02 13:03

The adress 0x004000000 is the default base adress in your linker settings. You can (should) change this anyway. I believe there are some articles on MSDN about load adresses of applications that explain the why and how. Basically, windows tries to load you application into this adress space. If there is already another application loaded (most probably is -> default base adress of VC) then it will 'relocate' you application to another adress.

The adress you mentioned 0x004013AB is just 0x13ab bytes into the start of your application (0x00400000). If you take a look at the assembly listing of your app, or set a breakpoint onto this adress (depending on the load adress on your debuggin environment) you will find the spot where the error occurs.

Hope it helps.

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

subclassing and messages

RK_200027-Aug-02 9:38

RK_2000

27-Aug-02 9:38

If you subclass a CListCtrl and call it CMyListCtrl and then use the CMyListCtrl as a member variable in a dialog box, some of the messages are caught by the parent dialog and some are sent to the CMyListCtrl. I was wondering if there is a way to direct these to catch these in my actual dialog instead of in my control.

Re: subclassing and messages

Renjith Ramachandran27-Aug-02 9:41

Renjith Ramachandran

27-Aug-02 9:41

PreTranslateMessage()

Renjith-CPian.

Re: subclassing and messages

Tomasz Sowinski27-Aug-02 9:43

Tomasz Sowinski

27-Aug-02 9:43

It seems you've used message reflection to handle control notifications. If you want to give dialog a chance to handle them as well, use ON_NOTIFY_REFLECT_EX and return FALSE from handler defined in control class.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Using CFileDialog - 2 questions

ns27-Aug-02 9:35

27-Aug-02 9:35

1.How do I start my CFileDialog in a particular folder. Actually I want it to detect the folderthe app is in, and start off in that directory by default.

2. Same question a s above, but now I also want the name of a particular file in the app directory(known file) to be populating the File NAme box in CFileDialog.

Thanks,
I hope it can be done.
ns

Its the Open dialog

Re: Using CFileDialog - 2 questions

jmkhael27-Aug-02 9:38

jmkhael

27-Aug-02 9:38

CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL );

where :
lpszFileName
The initial filename that appears in the filename edit box. If NULL, no filename initially appears.

try working on it!

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Using CFileDialog - 2 questions

ns27-Aug-02 9:46

27-Aug-02 9:46

Okay. but how do we set the default directory? I havent tried your idea yet but I'm thinking I'll be entering stuff like:

lpszFileName = "file1.txt"<br />

with no directory info....

So am I missing something?

Thanks so much,
ns

Re: Using CFileDialog - 2 questions

jmkhael27-Aug-02 10:12

jmkhael

27-Aug-02 10:12

CFileDialog has one struct like this:

typedef struct tagOFN { // ofn
DWORD lStructSize;
HWND hwndOwner;
HINSTANCE hInstance;
LPCTSTR lpstrFilter;
LPTSTR lpstrCustomFilter;
DWORD nMaxCustFilter;
DWORD nFilterIndex;
LPTSTR lpstrFile;
DWORD nMaxFile;
LPTSTR lpstrFileTitle;
DWORD nMaxFileTitle;
LPCTSTR lpstrInitialDir;
LPCTSTR lpstrTitle;
DWORD Flags;
WORD nFileOffset;
WORD nFileExtension;
LPCTSTR lpstrDefExt;
DWORD lCustData;
LPOFNHOOKPROC lpfnHook;
LPCTSTR lpTemplateName;
} OPENFILENAME;

lpstrInitialDir
could help u with something??

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

many many thanks!

ns27-Aug-02 10:27

27-Aug-02 10:27

Thanks. Thats great info. I didnt know that this struct existed, and really didnt see it mentioned in the CFileDialog documentation, at least at first glance.
Appreciate it,
ns

Re: many many thanks!

jmkhael27-Aug-02 10:29

jmkhael

27-Aug-02 10:29

Great! Glad could be a help!

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

image free....

pnpfriend27-Aug-02 9:20

pnpfriend

27-Aug-02 9:20

Hello!
I saw the article about "Load, show and convert miscellaneous file-formats using freeimage
" in this codeproject site. The project is so great.. Gettting image file information is what I need. But I don't want to use MainFrame... Document.. or menu bar.. at all..
All I need is only file name..
So I create new testing Dialog based project Called, JPEGINFO,
Then I add following function..to my project.

<br />
BOOL CJPEGINFODlg::GetImageInfo()<br />
{<br />
  FIMULTIBITMAP *m_pBitmapMP;<br />
  FIBITMAP *m_pBitmap;<br />
  <br />
   m_pBitmap = NULL;<br />
   m_pBitmapMP = NULL;<br />
   CString	msg,msg1,msg2;<br />
<br />
   CString filename = "E:\\filesfolder\\two\\New Folder\\FaxMachines.JPG";  // this is a file name to be read..<br />
   <br />
   m_pBitmap = FreeImage_LoadJPEG(filename,JPEG_DEFAULT); //get freeimage image    <br />
   m_pBitmapMP = FreeImage_OpenMultiBitmap(FIF_JPEG,filename,false,false,false);<br />
<br />
	if( !m_pBitmap )<br />
  {<br />
		MessageBox( "Sorry couldn't open!!");<br />
    return false;<br />
      <br />
  }<br />
/*<br />
get all the information such as name, width, height, and resolution here....<br />
*/<br />
return true;	<br />
}<br />

But I got following errors..

<br />
<br />
--------------------Configuration: JPEGINFO - Win32 Debug--------------------<br />
Compiling...<br />
JPEGINFODlg.cpp<br />
Linking...<br />
JPEGINFODlg.obj : error LNK2001: unresolved external symbol __imp__FreeImage_OpenMultiBitmap@20<br />
JPEGINFODlg.obj : error LNK2001: unresolved external symbol __imp__FreeImage_LoadJPEG@8<br />
Debug/JPEGINFO.exe : fatal error LNK1120: 2 unresolved externals<br />
Error executing link.exe.<br />
<br />
JPEGINFO.exe - 3 error(s), 0 warning(s)<br />

I included "freeimage.h" to my project though.
i don't know why I can't run. Would you please help me...
Thank you so much..

Re: image free....

Renjith Ramachandran27-Aug-02 9:38

Renjith Ramachandran

27-Aug-02 9:38

the LNK2001 Error shows when the Linker cannot find the label,function or variable in all the object files/libs that searches...
or a missing function body

look that...

Renjith-CPian.

Socket Space Carnage

magey27-Aug-02 9:01

magey

27-Aug-02 9:01

I'm working on a multi threaded (32 threads) application thats really intense on the tcp/ip stack, i.e. using a lot of sockets (up to 64 at) once, each thread is using 2 sockets, one for receive and one for send. how do I make it not eat up all the free sockets? after some time the program has ran and created/closed lots of sockets, i cant connect to anywhere from my machine, everything is denied, im suspecting my app eats up all the socket space or something.. but I do closesocket() on each socket i finish using.
Anyone knows what can I do to solve this?

Cheers,
Magey.

Re: Socket Space Carnage

Renjith Ramachandran27-Aug-02 9:45

Renjith Ramachandran

27-Aug-02 9:45

i think that may bcz of u forget to deallocate the previously allocated objects in your app..
review your code for find them..There is no other way,bcz i dunno how you implement that....

Renjith-CPian.

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