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Hello,
The only way that you'll learn to write a complete program is to do it yourself. The things that you'll learn from sample code is almost nothing more than how to use it.
Programming is not as most people think: writing code, but programming is way more than that: finding and designing solutions to a given problem. Writing code is just one way to implement it and this too is a skill that is only learned by doing.
So the best way for you is a simple problem that you have (this can be tetris or some administrative problem) and try to make a sound solution for it. Than implement the solution in some programming language.
This is how I learned to make programs.
Hope this helps.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Hi Bob,
Very good answer, that's how a learned too! You find some thing that you wish to write a program for, then figure out how to do it, one piece at a time, as you write it.
P.S. You once told me you where taking classes, well I am now going back to. I need those little pieces of paper.
INTP
Every thing is relative...
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Hello John,
Thank you! 
John R. Shaw wrote: P.S. You once told me you where taking classes, well I am now going back to. I need those little pieces of paper.
If all goes well, then I'll get my paper in 6 months.  After that, I'll (happily) start working.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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You might try looking here[^] on SourceForge.
Software Zen: delete this; // <a href="http://www.codeproject.com/script/profile/whos_who.asp?msg=1307432&id=10338#xx1307432xx" rel="nofollow">Fold With Us!</a>[<a href="http://www.codeproject.com/script/profile/whos_who.asp?msg=1307432&id=10338#xx1307432xx" target="_blank" rel="nofollow" title="New Window">^</a>]
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Thank you all for your replies. As I ahve said I am a (self proclaimed) intermediate programmer - perhaps that is overtating my skill - its hard to judge my abilities when I have nothing to compare them too.
By looking at the code for a program that I am familiar with (ie Tetris) I can pick apart things I know and find things I don't know. By finding code I am not familiar with, it is my belief, I can gain a direction and figure out what I need to learn to further my understanding of programming.
I can read all the books I want, but theory is just that - theory. Without practice (again, I'm not 100% familiar with all aspects of programming) or some 'reverese engineering' finding a direction to lead myself down can be frustrating.
If I could define a problem and then try to find a solution to get an answer I would - I think my biggest issue is not being familiar with all the tools I have at my disposal to complete the job.
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Here is an idea for you!
Get a copy of "The C++ Programming Language" by Bjarne Stroustrup. Recreate the code for the desktop calculator, by typing it in by hand (important). Once you have it working, figure out how to get it to work with a (Windows) GUI front end (may require some rewriting).
I guarantee, by the time you have accomplished that, you will know a lot more about programming.
I have an algibraic equation parser function that I wrote in C, 18-19 years ago (that still works today). I started with some code in a book, I rewote it, modified it completely, and expanded its capabilities. Then I created a caculator and a program for graphing algibraic equations. Well actualy, in those days, I had to create a DOS windowing interface first, since my goal was to write an equation graphing program to start with.
When you are writing code for your self it can be fun, it only becomes dry (some times) when you have to do it for someone else. I stopped enjoying it as much when I could look at the problem and know the answer before I touched a keyboard (what fun is that?), after that it was just typing, and typing, and typing. To bad the computer could not just read my mind.;)
As for the understanding what tools you have and how to use them, first understand the language at the console level. The majority of the tools available with VC6 are to simplify creating GUI applications and are MS Windows specific.
Well that's enough, good luck.
INTP
Every thing is relative...
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I have loaded image using GDI funcs and ZOOMING in and out using stretchblt funcn with memory as source and window screen as destination. while zooming in i am invalidating the screen area with third param set as false and hence able to achieve flicker free image but how to do low flicker (if possible no flicker ) for zoom out.
also please tell me if i can directly write on to the vdu buffer and freeze the client area until the write on buffer is complete
Thankyou
nothing is illegal until you are caught
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There are articles at CP on flicker free drawing, and it is probably in the FAQ as well. Essentialy you need to override OnEraseBkgnd() so that it does not earase the background (causing flicker), then do all the drawing (including background if any) in the OnDraw() function. It actualy can be a little more complicated than that, so look at any code the displays bitmaps of thumb nails or allows you to edit an image (See CP articles).
INTP
Every thing is relative...
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how to maintain the logfile of any file being accessed (opened,modified,renamed,deleted) in any drive(i mean the whole system). the application should be developed in MFC. please help me and reply as soon as possible.
RabiaAslam
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uh. What have you written? I have read it in many ways, it simply is not making sense.
Please refine your question if you would need someone to respond quickly.
Vipin - MVP
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See here for how file monitoring is done.
"Take only what you need and leave the land as you found it." - Native American Proverb
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Call FindFirstChangeNotification for each drive on the system, then do a WaitForMultipleObjects on the list of handles returned. See the docs for FindFirstChangeNotification.
onwards and upwards...
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I've got to improve some code with memory leaks but how to identify their location in a source file, I've got only this output after program terminates and not a hint for a source code:
Detected memory leaks!
Dumping objects ->
{715} normal block at 0x00EAE450, 800 bytes long.
Data: < > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
{541} normal block at 0x0033FBC8, 4 bytes long.
Data: <0 > 30 00 00 00
{540} normal block at 0x0033FA10, 5 bytes long.
Data: <000 > 30 30 30 00 CD
{279} normal block at 0x0033F8A0, 8 bytes long.
Data: < > 00 00 00 00 00 00 00 00
{273} normal block at 0x0033F6C0, 8 bytes long.
Data: < > 16 1E 00 00 EA 1D 00 00
{272} normal block at 0x0033F680, 2 bytes long.
Data: <01> 30 31
{268} normal block at 0x0033ED48, 4 bytes long.
Data: < > 00 00 00 00
{266} normal block at 0x0033EE10, 2 bytes long.
Data: <1 > 31 00
{264} normal block at 0x0033ED88, 2 bytes long.
Data: <0 > 30 00
{232} normal block at 0x0033E3A0, 5 bytes long.
Data: < > 00 00 00 00 00
Object dump complete.
9ine
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I recommend you use the following FREE leak detecting code:
http://code.axter.com/leaktracker.h[^]
You can download the assoicated DLL file via following link:
http://code.axter.com/leaktracker.zip[^]
This program will output the leak location (source-file-name, line-number). It will also give the Function name if your compiler supports it (like VC++7.x & GNU 3.x)
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
-- modified at 8:28 Wednesday 28th December, 2005
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this does not work, first I just added leaktracker.h to the project, lib and dll to windows system dir and run the project from VS 2003. Then closed the project and get standart memory leak in VS output window but there was no file C:\zz_David_Maisonave_DefaultLeakTrackerLogFile.log after termination. Then I added #include to the .cpp file that created additional mem leak on purpose for testing and the project doesnt want to be compiled:
Compiling...
sGenDlg.cpp
**************************************************************************************
Note: Including leaktracker implementation... DO NOT USE THIS BUILD FOR PRODUCTION!!!
**************************************************************************************
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2433: 'new' : 'inline' not permitted on data declarations
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2365: 'new' : redefinition; previous definition was a 'member function'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2078: too many initializers
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2440: 'initializing' : cannot convert from 'int' to 'void *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2143: syntax error : missing ';' before '('
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2226: syntax error : unexpected type 'size_t'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2059: syntax error : ')'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2143: syntax error : missing ';' before '{'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2447: '{' : missing function header (old-style formal list?)
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2433: 'new' : 'inline' not permitted on data declarations
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2365: 'new' : redefinition; previous definition was a 'member function'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2078: too many initializers
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2440: 'initializing' : cannot convert from 'int' to 'void *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2143: syntax error : missing ';' before '['
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C3409: empty attribute block is not allowed
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4518: 'char ' : storage-class or type specifier(s) unexpected here; ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4228: nonstandard extension used : qualifiers after comma in declarator list are ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4518: 'int ' : storage-class or type specifier(s) unexpected here; ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4228: nonstandard extension used : qualifiers after comma in declarator list are ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4518: 'char ' : storage-class or type specifier(s) unexpected here; ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : warning C4228: nonstandard extension used : qualifiers after comma in declarator list are ignored
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2143: syntax error : missing ';' before '{'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(188) : error C2447: '{' : missing function header (old-style formal list?)
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(264) : warning C4005: 'new' : macro redefinition
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(10) : see previous definition of 'new'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(143) : error C2665: 'operator new[]' : none of the 5 overloads can convert parameter 2 from type 'const char [91]'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\crtdbg.h(669): could be 'void *operator new[](size_t,int,const char *,int)'
while trying to match the argument list '(size_t, const char [91], long, const char [29])'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(176) : warning C4244: '*=' : conversion from 'double' to 'int', possible loss of data
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(188) : warning C4244: '*=' : conversion from 'double' to 'int', possible loss of data
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(225) : error C2665: 'operator new' : none of the 5 overloads can convert parameter 2 from type 'const char [91]'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\crtdbg.h(662): could be 'void *operator new(size_t,int,const char *,int)'
while trying to match the argument list '(size_t, const char [91], long, const char [29])'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(231) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(234) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(237) : warning C4244: 'argument' : conversion from 'double' to 'int', possible loss of data
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(259) : warning C4018: '<' : signed/unsigned mismatch
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(261) : warning C4018: '<' : signed/unsigned mismatch
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\sGenDlg.cpp(290) : error C2665: 'operator new[]' : none of the 5 overloads can convert parameter 2 from type 'const char [91]'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\crtdbg.h(669): could be 'void *operator new[](size_t,int,const char *,int)'
while trying to match the argument list '(size_t, const char [91], long, const char [29])'
9ine
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In your sGenDlg.cpp file, the leaktracker.h must be the LAST included header.
If you include it before any other headers, you'll get compile errors, or runtime errors.
This program was originally developed using VS 2003, and then ported to GNU, Borland, and VC++ 6.0.
So it should definitely work on VS 2003.
FYI:
If it doesn't produce a log file, then either it was not compiled in DEBUG moder, or there were no memory leaks.
Since you didn't get compile errors the first time, I must assume it was not compiled in DEBUG mode.
If you don't see the following message when you compile, then the leak tracking code is not getting included.
**************************************************************************************
Note: Including leaktracker implementation... DO NOT USE THIS BUILD FOR PRODUCTION!!!
**************************************************************************************
If you wish to include the leak tracking code in the release version of your program you could do so by defining the following macro before including the header:
#define DEBUG_VERSION_
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
-- modified at 10:59 Wednesday 28th December, 2005
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No I'm not inclined to use it in release version, I'm sure I've got debug compiler option and I included it as you said:
#include "stdafx.h"
#include "sGen.h"
#include "sGenDlg.h"
#include ".\sgendlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
#include "Lib\lib.h"
#include "Lib\quantize.h"
#include "LibST\scomplexity.h"
// CsGenDlg dialog
#include "leaktracker.h"
CsGenDlg::CsGenDlg(CWnd* pParent /*=NULL*/)
: CDialog(CsGenDlg::IDD, pParent)
, m_freq(10)
, m_sr(128)
, m_len(30), data(0)
, m_asize(2)
, qt(0)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
All the same compiler errors again? it doesnt want to be compiled, I use VS2003.
As for the first time I did not include leaktracker.h in any cpp file at all, which is not proper as I've read from its manual that it should be included at least in one file, and I ran it in debug mode (which we select from proj settings->config manager->active solution config), and to test it I used on purpose allocation of memory with new command without deleting it.
What is your suggestions?
look at the errors again:
Compiling...
sGenDlg.cpp
**************************************************************************************
Note: Including leaktracker implementation... DO NOT USE THIS BUILD FOR PRODUCTION!!!
**************************************************************************************
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2433: 'new' : 'inline' not permitted on data declarations
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2365: 'new' : redefinition; previous definition was a 'member function'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2078: too many initializers
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2440: 'initializing' : cannot convert from 'int' to 'void *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2143: syntax error : missing ';' before '('
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2226: syntax error : unexpected type 'size_t'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2059: syntax error : ')'
c:\Documents and Settings\yc274\My Documents\Visual Studio Projects\COMPL\sGen\leaktracker.h(184) : error C2143: syntax error : missing ';' before '{'
and so on...
9ine
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I see the problem. This is an over-sight on our part.
In your above code, you have the following:
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
If you include the leaktracker.h file after the above line, that will cause the compile errors.
I've updated the leaktracker.h file so that it does an #undef for new.
#ifdef new
#undef new
#endif //new
You can download the new version, or just add the above 3 lines in the leaktracker.h file around line 177 (right before the new operator).
http://code.axter.com/leaktracker.h[^]
FYI:
If you're using MFC, also make sure to include the header after macros like IMPLEMENT_DYNCREATE.
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
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Thanks, great tool, now it works.
9ine
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Please have a look at umdh.exe
Vipin - MVP
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What is umdh.exe?
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
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Rational Purify?
-Prakash
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In your application, (if it is a MFC application, add the following in the InitInstance())
_CrtSetBreakAlloc(715);
it will break when it tries to allocation the leakage memory and you can find the source code.
Details can be "Memory Leak Detection" in VS.
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Hello,
I have the Ascii Code from a character, for example: 101, which is e. How can I convert this int Value into a char or better CString ?
With best regards,
RedDragon2kx
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