C / C++ / MFC

Re: don't understand MSDN explanations. Can someone explain this?

19-Sep-07 3:04

Are you not understanding stacks (e.g., pushing and popping), or byte alignments?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Nelek19-Sep-07 20:28

Nelek

19-Sep-07 20:28

Also...

In a simple mode with a comparison: The stack is a box with two doors, where the allocation of the memory are packets incoming through the "push" side, then the cpu use the info that is inside (like toxcct said, the pointer to an application that is running to have access or communication). Once the information is not needed anymore, then the box is discharged through the "pop" side to let the box containing new usefull things. If the box is overloaded, an error comes and the things doesn't work fine anymore.

about the bytes alignment... Maybe is a problem of language, but I can not relate the term with anything logical.

For me is like:

----Byte----
----Byte---- They are aligned

-Byte-------
------Byte-- They are not aligned

Re: don't understand MSDN explanations. Can someone explain this?

David Crow20-Sep-07 2:42

Re: don't understand MSDN explanations. Can someone explain this?

20-Sep-07 2:42

Using your analogy, a stack would only have one door, whereas a queue would have two doors. A stack gets items pushed and popped from the same end. A queue gets items pushed onto one end and popped from the other end.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Nelek20-Sep-07 4:12

Nelek

20-Sep-07 4:12

Ahmm, ok

then it can happen like in the step7. If one programmer opens/calls a lot of different functions/processes, without closing the previous ones... there must be a moment where the stack overflows and then the programm/cpu crashes.

What about the bytes alignment? Was I right?

What I still don't understand (sorry if I ask a lot) is what a relation has the alignment of the Bytes with the question of the stack.

If the Bytes of a stack are pushed and popped through the same entry... with what should to be aligned?

Re: don't understand MSDN explanations. Can someone explain this?

David Crow20-Sep-07 4:30

Re: don't understand MSDN explanations. Can someone explain this?

20-Sep-07 4:30

You seem to be confusing structure alignment (the byte packing stuff) with stack operations.

The #pragma pack(n) preprocessor directive specifies packing alignment for structure and union members. For example, for n having a value of 1, 2, 4, 8, or 16, each structure member after the first is stored on the smaller member type or n-byte boundaries.

Each occurrence of #pragma pack (push) stores the current packing alignment on an internal compiler stack. Each occurrence of #pragma pack (pop) retrieves the value at the top of an internal compiler stack and makes that value the new packing alignment.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Nelek21-Sep-07 1:47

Nelek

21-Sep-07 1:47

Yes I was mixing concepts.

Thanks, I don't understand it perfect, but more than before. This is in a level higher than mine. But at least I can now read the info without thinking is written in japanese Wink | ;)

:P

Thank you both

Fonts

Waldermort18-Sep-07 22:57

Waldermort

18-Sep-07 22:57

I have created a custom control which contains two buttons. I want these buttons to display the same arraows which are displayed on a scrollbars buttons. So, I create a font using the Marlett face name and instruct the button to use this font via WM_SETFONT. I also set the buttons text to "3" 4, 5 or 6 ( which maps to the arrows ). But the button still displays the number instead of the arrow. The marlett font doesn't contain any ASCII characters, it's all pictographs!

I have verified that the button is using the font via WM_GETFONT. Everything appears to be correct except that the arrows are not being displayed. Any clue as to what's gone wrong?

HFONT hFont = NULL;
    
hFont = (HFONT)SendMessage( m_hButtonUp, WM_GETFONT, 0, 0 );
if ( ! hFont )
    hFont = (HFONT)GetStockObject( DEFAULT_GUI_FONT );
if ( ! hFont )
    hFont = (HFONT)GetStockObject( ANSI_VAR_FONT );
    
if ( hFont )
{
    LOGFONT lf;
    GetObject( hFont, sizeof( LOGFONT ), &lf );
    
    _tcscpy_s( lf.lfFaceName, LF_FACESIZE, _T("Marlett") );
    
    hFont = CreateFontIndirect( &lf );
    
    SendMessage( m_hButtonUp,	WM_SETFONT, (WPARAM)hFont, TRUE );
    SendMessage( m_hButtonDown, WM_SETFONT, (WPARAM)hFont, TRUE );
    
    SendMessage( m_hButtonUp,	WM_SETTEXT, 0, (LPARAM)_T("3") );
    SendMessage( m_hButtonDown,	WM_SETTEXT, 0, (LPARAM)_T("4") );
}

Waldermort

Re: Fonts

KarstenK18-Sep-07 23:05

EM_GETSELTEXT Message Doesn't retrive the Text

18-Sep-07 23:05

The returncodes of the SendMessage() and try an Invalidate() of the controls D'Oh! | :doh:

Greetings from Germany

Re: Fonts

nbugalia18-Sep-07 23:14

nbugalia

18-Sep-07 23:14

SendMessage( m_hButtonUp, WM_SETFONT, (WPARAM)hFont, TRUE );

Have you checked the return value ? I mean has the font got set ? If not, check using different fonts like arial etc.

Re: Fonts

Waldermort19-Sep-07 0:46

Waldermort

19-Sep-07 0:46

The WM_SETFONT does not return a value according to MSDN, also I noted in my post that I did verify that the font has been set.

The mistake was simple, I forgot to set the SYMBOL_CHARSET flag.

Thanks anyway.

Waldermort

GauranG Shah18-Sep-07 22:37

GauranG Shah

18-Sep-07 22:37

Hello Friends,

I am using the Win32 Application. In this project I am using EM_GETSELTEXT to get the selected Text From Rich Edit Control.

RichEdit Control is in another window. I have retrived its handle through FindWindowEx() Function.

But When I use the Following code it doesn't retrive the selected text

WCHAR SText[100]={};
 lr = SendMessage(hChild,EM_GETSELTEXT ,(WPARAM)0,(LPARAM)SText);
  if(lr <0)
    {
          dError = GetLastError();
    }

lr shows the Number of charcter selected. But the SText(STEXT="") is empty after SendMessage.

nbugalia18-Sep-07 23:23

nbugalia

18-Sep-07 23:23

Gaurang, I completely agree with you. It returns the length but not the value.

GauranG Shah18-Sep-07 23:30

GauranG Shah

18-Sep-07 23:30

But why ??? do u have any Idea. ?? or is there any other way I can got the Selected text. WM_GETTEXT and WM_SETTEXT working fine.

David Crow19-Sep-07 3:24

19-Sep-07 3:24

GauranG033But When I use the Following code it doesn't retrive the selected text

It fails as a result of Unicode being used. You'll find that if you use ANSI, EM_GETSELTEXT would work as expected. Is that a viable option?

If not, use this:

char sz[100] = {'\0'};
LPWSTR SText;
LRESULT lr = SendMessage(hChild, EM_GETSELTEXT, 0, (LPARAM) sz);   
USES_CONVERSION;
SText = A2W(sz);

Notice your text that I quoted above is not formatted correctly.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah19-Sep-07 21:14

GauranG Shah

19-Sep-07 21:14

I tried you code. But still facing the same problem. Empty String.

is there any other way I can get the selected Text By user.
I have tried it in MFC application Like this

CWnd *hParent = FindWindow(_T("TfrmChat"),0);
CWnd *hChild = FindWindowEx(hParent->m_hWnd,0,_T("TPanel"),0);
hParent =  FindWindowEx(hParent->m_hWnd,hChild->m_hWnd,_T("TPanel"),0);
hChild =   FindWindowEx(hParent->m_hWnd,0,_T("TExRichEdit"),0);

char sz[100] = {'\0'};
LPWSTR SText;
LRESULT lr;
lr = hChild->SendMessage(EM_GETSELTEXT, 0, (LPARAM) sz);
 USES_CONVERSION;
SText = A2W(sz);

David Crow20-Sep-07 2:27

How to convert *.tif to *.bmp?

20-Sep-07 2:27

GauranG033Empty String.

How are you verifying this?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

TooShy2Talk18-Sep-07 22:34

TooShy2Talk

18-Sep-07 22:34

Hello, guyz.

In my current project I want to convert a tiff file(*.tif) to a bitmap file(*.bmp) but I don't know how to do it.
Do you have any idea on how will I able to do it or knew a thread or post with this topic?

Hope you can help me with this.
Thank you.

KarstenK18-Sep-07 22:58

18-Sep-07 22:58

An easy way is to select a CBitmap in a DC and draw the tiff. Or I know the CXImage class here at CP.

Greetings from Germany

TooShy2Talk18-Sep-07 23:20

TooShy2Talk

18-Sep-07 23:20

Thank you for your time KarstenK.

Can you please state more in details, because i'm just starting in C++.

Best regards

KarstenK18-Sep-07 23:42

18-Sep-07 23:42

Then you got to learn a lot and be patient "Rom wasnt build on a day".

Conversion of graphics is an interface problem: you need to transport the data from the source to a (temporary) format which the target format can understand.

I strongly advice you to download and step trough this really good project: http://www.codeproject.com/bitmap/cximage.asp[^]

If you really like graphic conversion you will agree that this one is outstanding:
http://www.codeproject.com/bitmap/extendedbitmap2.asp[^]

This will take you some hours, cups of coffee and some headaches if you are really engaged. But it is worth it. Cool | :cool:

Greetings from Germany

reading simple excel sheet without using odbc

Mark Salsbery19-Sep-07 5:48

Mark Salsbery

19-Sep-07 5:48

Writing a robust TIFF file loader is a big project.

If you can use GDI+, it can save alot of work.

There's also the ATL CImage class, which uses GDI+ for loading and saving image files.
With CImage, you could do it in a few lines of code:

#include <atlimage.h>
...
    CImage image;
    image.Load(_T("C:\\TIFFFile.tif"));
    image.Save(_T("C:\\BMPFile.bmp"), Gdiplus::ImageFormatBMP);

Note that BMP files have a limited set of supported image formats. See
the documentation for the BITMAPINFOHEADER struct for details.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

neha.agarwal2718-Sep-07 21:58

neha.agarwal27

18-Sep-07 21:58

Hi all,

I have simple excel sheet in which i have 2 columns 1)employee name 2) employee id. All the columns having values is in sheet1. Now, my problem is i want to read my excel using code. i don't know how to do it. There are various articles using odbc but i don't want to use odbc. Can nybody tell me how to do it....

Thanks in advance.

Re: reading simple excel sheet without using odbc

KarstenK18-Sep-07 22:59