How to delete a Class - C / C++ / MFC Discussion Boards

RobJones25-Nov-01 16:39

25-Nov-01 16:39

Hello,
I am trying to read the last 128 bytes of a compressed file(MP3)... How can I extract the last 128 bytes and display this information in a CString.. I am using CFile to open the mp3 and dumping the entire contents into a char.. I then dump that into a CString.. but the format is all wrong. Can anyone give me some pointers on how to dump the last 128 bytes of a file into a CString? If I open the file in notepad and scroll to the bottom.. I can see the information I'm trying to extract.

Thanks,

Rob

Re: Reading raw data

Michael Dunn25-Nov-01 17:31

Michael Dunn

25-Nov-01 17:31

A CString is the wrong thing to use. I assume you're looking for an ID3v1 tag? The tag can have embedded 0 bytes, or the tag might not even be present. Use an array of 128 BYTEs instead and parse it manually. See this shell extension article where I do exactly this.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
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Re: Reading raw data

RobJones25-Nov-01 18:29

RobJones

25-Nov-01 18:29

Thanks Mike!! Thats exactly what I'm trying to do. I'll give it a look in the morning.

Thanks again

Rob

Unicode version of strlen

Matt Newman25-Nov-01 15:34

Matt Newman

25-Nov-01 15:34

I am converting a class to unicode and got all of it but a single instance of strlen. What should I use instead?

-Matt Newman
-Matt Newman

Re: Unicode version of strlen

Nish Nishant25-Nov-01 16:23

Nish Nishant

25-Nov-01 16:23

Not sure, but what about wcslen?

Nish

Sonork ID 100.9786 voidmain
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Re: Unicode version of strlen

Matt Newman25-Nov-01 16:34

Matt Newman

25-Nov-01 16:34

Yep it worked. Thanks.

-Matt Newman
-Matt Newman

Re: Unicode version of strlen

PJ Arends25-Nov-01 19:04

PJ Arends

25-Nov-01 19:04

Why not use the tchar macros, that way your code will work with SBCS, MBCS and UNICODE. The tchar macro for strlen is _tcslen().

---
It may be that your sole purpose in life is simply to serve as a warning to others.

How to delete a Class

Steve L.25-Nov-01 11:57

Steve L.

25-Nov-01 11:57

To delete a class what I do is i go to the File View and I delete the .cpp and .h files of my class. If i go to the class wizard the class can not be found so it looks right. However, if i try to create a class of the same name of the class i just deleted it calls it class1 as opposed to just class. What i have to do is go to windows explorer and delete the .cpp and .h files which i thought i had already deleted. Then i goto the class wizard and it says something like can not find class then it asks me if it wants me to delete it. This doesn's seem like the right way to delete a class. Is it?

<marquee>click -> A Sign of Boredom <- click

Re: How to delete a Class

Christian Graus25-Nov-01 12:43

Christian Graus

25-Nov-01 12:43

VC has removed the files from the project, but not your hard drive. So go to the directory and delete the old class ( the filename won't have the leading 'C' in it ), and then start again.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: How to delete a Class

25-Nov-01 13:41

One way to delete a class created by classwizard in V6.0:

Say, your class is Cabc.

Delete the abc.h and abc.cpp file in the FileView .
Delete the abc.h and abc.cpp file using the windows explorer.
Do a string search on 'abc' using 'Find in files' and click on the line containing 'abc' and '.clw' in the output window to open class wizard in the editor.

Double click on the line containing the string '.clw' in the output window.

Find the references like the following for 'abc' and delete those lines.
[CLS:Cabc]
Type=0
HeaderFile=abc.h
ImplementationFile=abcr.cpp
BaseClass=CWinThread
Filter=N
LastObject=Cabc

Also, find out the part of the .clw file as below and change the class
count number to 1 less. Delete the line containing 'Class3=Cabc'.

ClassCount=3
Class1=CMyAppApp
Class2=CMyAppDlg
Class3=Cabc

At times 'Class3=Cab' may not be with the other classes as below:
(It is a good idea to have them together.)

ClassCount=3
Class1=CMyAppApp
Class2=CMyappDlg

ResourceCount=2
Resource1=IDR_MAINFRAME
Class3=Cabc
Resource2=IDD_MYAPP_DIALOG

Finally it will be something as below:

ClassCount=2
Class1=CMyAppApp
Class2=CMyAppDlg

ResourceCount=2
Resource1=IDR_MAINFRAME
Resource2=IDD_MYAPP_DIALOG

Click on the file menu and click on save.

close the .clw window (do not forget to do this).

It is a good idea to close the workspace and start again.

Re: How to delete a Class

Christian Graus25-Nov-01 15:35

Christian Graus

25-Nov-01 15:35

Gosh that's a whole lot of work. Why not delete the .clw file and let VC regenerate it ?

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: How to delete a Class

25-Nov-01 16:31

You are right. That works and is lot easier! Thanks Christian.

Database woes

Curufinwe25-Nov-01 11:30

Curufinwe

25-Nov-01 11:30

Hi!

I am a newbie to vc++ and I am currently trying to write a small database application. I looked in almost everything i can find about databases I could find and got along nicely so far. I am using the application wizard creating a sdi application connected to a database via odbc. this enables me to look at one table of the database. And here my troubles start: I want the user to not only look at one table, but at several if possible, having the user switch between the tables with the menu for example. So far I am adding a new class which inherets from CRecordSet and one that inherets from CRecordView which is connected to a new dialog resource. And at this point I am completly lost on how to switch between those two dialogs for the tables. Help would be much appreciated on how to solve this problem (and also if there are better approaches to make it possible to look at a second table).

Thanks

Re: Database woes

David Salter26-Nov-01 11:45

David Salter

26-Nov-01 11:45

Have a look at the following. This allows you to create recordsets dynamically rather than the MFC way of building a recordset that is bound to one table.

http://www.codeproject.com/database/caaodbcclass.asp

Dave.

Docking Windows

25-Nov-01 11:14

Hello everybody,

is there anybody who can tell me how can build a docking windows, I mean that windows that could be attached to one of the border of the main application and that can contain some dialogs or something more?

Thank you Confused | :confused:

Re: Docking Windows

Masaaki Onishi25-Nov-01 18:14

Masaaki Onishi

25-Nov-01 18:14

Hello, the codegurus around the world. Wink | ;)

There are many libraries related to the docking windows.
For example, BCG control, Xtream Tool kit (CJLibrary - old name).

Individually, I prefer CSizingControlBar class developed by Cristi Posea. Cool | :cool:

Please, don't send me your email about your questions directly.
Have a nice day!
Sonork - 100.10571:vcdeveloper Wink | ;)

-Masaaki Onishi-

radiobutton/checkbutton query

Bill Gates Antimatter Particle25-Nov-01 11:13

Bill Gates Antimatter Particle

25-Nov-01 11:13

It is easy to access the dc of a radiobutton / checkbutton - Via onctlcolour() / WM_CTLCOLORSTATIC. However who can tell me how to override the default drawing of the WHITE CIRCLE / SQUARE and its CHECK / TICK ONLY. Where the hell is it drawn and how? I want to be able to change the colour of the dot in the radio button or tick in a checkbox while leaving the rest of its processing as default. I know how I could implement this with an owner draw class and bitmaps, but I cant find ANY information as to how the default drawing occurs. Where is it hidden? Does ANYBODY know Confused | :confused:

"Life begins at 140"

Re: radiobutton/checkbutton query

Michael Dunn25-Nov-01 17:33

Michael Dunn

25-Nov-01 17:33

Those weren't made to be customizable (well, pre-XP at least). The button part is drawn by the common controls library. In XP it's handled by the visual styles ("themes") system.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

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and

Sonork - 100.10414 AcidHelm

Re: radiobutton/checkbutton query

Nish Nishant25-Nov-01 17:51

Nish Nishant

25-Nov-01 17:51

Bill Gates Antimatter Particle wrote:
Bill Gates Antimatter Particle

Wait till John Simmons sees your nick!
Just wait!!!

Nish

Smile | :)

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Can we pass reference to a vector as an argument to a function?

25-Nov-01 10:06

I was wondering can I pass a vector reference as an argumnet to a function?
Like
I can do the following: void myfunction(int & myarray[10][10])
there by passing reference to a two dimensional array as function argument.

But when I try the folloing I get compilation error
I have a class called 'Myclass'
In this class I declare a function called 'Myfunct' the declaration is as follows:
void Myfunct(vector |Myclass| &mc);
//I am trying to pass a reference to a vector of type 'Myclass'
//I get error message

Does this mean I cannot pass reference to a vector as argument?

Cry | :((

Re: Can we pass reference to a vector as an argument to a function?

Christian Graus25-Nov-01 10:11

Christian Graus

25-Nov-01 10:11

What's the error ? I just did this:

#include "stdafx.h"
#include <vector>
#include <iostream>

using namespace std;

int MyFunc(vector<int> & vec)
{
	return vec.size();
}

int main(int argc, char* argv[])
{
	printf("Hello World!\n");
	vector<int> MyVector;
	MyVector.push_back(1);
	MyVector.push_back(3);
	MyVector.push_back(72);

	cout << MyFunc(MyVector);
	
	return 0;
}

and it works fine.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Do you know the GradientFill function?

jin sok cho25-Nov-01 6:02

jin sok cho

25-Nov-01 6:02

Hi friends!
Do you know the GradientFill function at Visual C++?
I have acquainted with this function when studying graphic.
And the contents are like below.
( for more information, please refer to MSDN )

/////////////////////////////////////////////
”Drawing a Shaded Triangle”

TRIVERTEX vert [4] ;
GRADIENT_TRIANGLE gTri;
vert [0] .x = 0;
vert [0] .y = 0;
vert [0] .Red = 0x0000;
vert [0] .Green = 0x0000;
vert [0] .Blue = 0x0000;
vert [0] .Alpha = 0x0000;

vert [1] .x = 100;
vert [1] .y = 0;
vert [1] .Red = 0x0000;
vert [1] .Green = 0x0000;
vert [1] .Blue = 0xff00;
vert [1] .Alpha = 0x0000;

vert [2] .x = 100;
vert [2] .y = 32;
vert [2] .Red = 0x0000;
vert [2] .Green = 0x0000;
vert [2] .Blue = 0xff00;
vert [2] .Alpha = 0x0000;

vert [3] .x = 0;
vert [3] .y = 32;
vert [3] .Red = 0xff00;
vert [3] .Green = 0xff00;
vert [3] .Blue = 0xff00;
vert [3] .Alpha = 0x0000;

gTRi[0].Vertex1 = 0
gTRi[0].Vertex2 = 1
gTRi[0].Vertex3 = 2

gTRi[1].Vertex1 = 0
gTRi[1].Vertex2 = 2
gTRi[1].Vertex3 = 3
GradientFill(hdc,vert,4,&gTRI,1,GRADIENT_FILL_TRIANGLE);
///////////////////////////////////////////////
And I have two questions.

1.GradientFill(hdc,vert,4,&gTRI,1,GRADIENT_FILL_TRIANGLE);
I’m curious to know the internal algorism of Visual C++’s materializing (as a picture) when there is given arguments on GradientFill().

2.vert [3] .Green = 0xff00;
I know RGB rule express 256 colors, from 0 to 255.
But GradientFill controls the color through hexadecimal.
I’d like to know how I can turn colors by hexadecimal into RGB 256 colors.
Maybe, there is a rule. I’d like to know what it is.

Re: Do you know the GradientFill function?

Christian Graus25-Nov-01 10:16

Christian Graus

25-Nov-01 10:16

1. I dunno, but I'd imagine it's just the obvious one.

2. Green = 00ff00 because 0xFF = 255, so it's just a case of 0 Red, 255 Green, 0 Blue = Green. COLORREFs are created with the RGB macro which just shifts the values passed in to create the DWORD that holds it ( COLORREF is a typedef for DWORD ). To get the red/green/blue values out of a COLORREF ( which .xff00 is, just stated in hex ), just use the GetRValue/GetGValue/GetBValue macros.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: Do you know the GradientFill function?

jin sok cho25-Nov-01 21:03

jin sok cho

25-Nov-01 21:03

Thanks!

But I want to know more information the first problem.

Please Help me!

Re: Do you know the GradientFill function?

Christian Graus26-Nov-01 1:06

Christian Graus

26-Nov-01 1:06

At risk of stating the obvious, as M$ do not give us the source, I really cannot tell you more than the MSDN tells you.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

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