C / C++ / MFC

Phil J Pearson30-Sep-02 6:25

Phil J Pearson

30-Sep-02 6:25

Just some first thoughts...
1. Had you noticed there seems to be some recursion here? Why does CView::OnPaint end up calling CView::OnPaint ??
2. Why is the CWnd * parameter to AfxCallWndProc = zero?
3. Why is the CWnd * parameter (this pointer) to CView::OnPaint = 7

Perhaps a breakpoint at line 183 of CView::OnPaint would help you to lever your way in.

The opinions expressed in this communication do not necessarily represent those of the author (especially if you find them impolite, discourteous or inflammatory).

Mike Eriksson30-Sep-02 22:12

Mike Eriksson

30-Sep-02 22:12

Thank You! Smile | :)

This was just the help I needed to find the error! Which by the way was due to an attempt to do resizable windows and not understanding what I was doing Confused | :confused:

I copied some code from CodeProject and now I can't find this article anymore. So maybe the author got the same error and revoked the article.

Anyway, thanks to your pointers I manage to make my application bug-free(.???.) AND resizable!

Big Grin | :-D

Mike Eriksson
Sonork 100.21825

Phil J Pearson1-Oct-02 1:03

Phil J Pearson

1-Oct-02 1:03

Pleased to be able to help, and pleased to get your grateful reply.

Cheers!

The opinions expressed in this communication do not necessarily represent those of the author (especially if you find them impolite, discourteous or inflammatory).

A 'new' operator problem:

Michael P Butler30-Sep-02 22:33

Michael P Butler

30-Sep-02 22:33

It looks like an invalid window handle. Are you trying to draw something on the View before it has been properly created?

Michael

"Time and tide melts the snowman."
-- The Doctor (Doctor Who: Time and the Rani

ns30-Sep-02 6:11

30-Sep-02 6:11

In the following:

    char* tempBuffer = NULL;
std::vector <char*> nBuffer;
int nRetNewDB;
CFileDialog fileDlg1(TRUE, ".*", NULL, OFN_EXPLORER|OFN_ALLOWMULTISELECT, "All Files(*.*)|*.*||",NULL);

nRetNewDB = fileDlg1.DoModal();

if (nRetNewDB == IDOK)
{
    POSITION Pos;

    Pos = fileDlg1.GetStartPosition();
    while (Pos != NULL)
    {
    CString sPathName = fileDlg1.GetNextPathName(Pos);

    int nSize = ReadPMAFile(sPathName, tempBuffer); //if NULL goes in , size comes back

    if(nSize !=0)
    {
        tempBuffer = new char[nSize+1];

        ReadPMAFile(sPathName, tempBuffer);

        nBuffer.push_back(tempBuffer);

    }

    }

}

I am getting compile errors regarding 'new':

c:\program files\microsoft visual studio\vc98\include\new(35) : error C2061: syntax error : identifier 'THIS_FILE'
c:\program files\microsoft visual studio\vc98\include\new(35) : error C2091: function returns function
c:\program files\microsoft visual studio\vc98\include\new(35) : error C2809: 'operator new' has no formal parameters

help! I've used 'new' a thousand times but somethings gone wrong here.....

Thanks,
ns

Re: A 'new' operator problem:

jmkhael30-Sep-02 6:13

Re: A 'new' operator problem: got it now..

30-Sep-02 6:13

Are u using namespace std??
And i see that ur vector isnt given a type, why??

Deal with the first error first:
identifier 'THIS_FILE'
And generaly u gotta move some header include before or after
#define THIS_FILE

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

ns30-Sep-02 6:22

30-Sep-02 6:22

the vector does have a type: char* but CP did something to the angled brackets...

I dont have anything fancy in my includes:

#include "stdafx.h"
#include "FreadTest.h"

#include "FreadTestDoc.h"
#include "FreadTestView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include <vector>

Oh gosh! I had to move the #include vector to above the #ifdef stuff. Now its compiling. Thanks for the juggling hint. Its bizarre!

Thanks,
ns

Re: A 'new' operator problem: got it now..

jmkhael30-Sep-02 6:21

30-Sep-02 6:21

Had that and fixed it that way, i guess its mainly that vector needs to see THIS_FILE [] = __FILE__; so better let him have it!

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

FormView override doubt

RuiSantiago30-Sep-02 5:58

30-Sep-02 5:58

Hello!

I'm overriding OnActivateView function in my CFormView derived class, and it is in that function that i'm creating and displaying some objects, the number of objects depends on a database query. In order to resize my form, i must have its CRect parameters.

Inside OnActivateView i do : GetClientRect(&myRect);, but all the size parameters (left, top, right, bottom) are equal to 0.

Maybe i'm wrong but i understand that these values should only be available when OnActivateView is finished.

My question: Is there an onverride for CFormView that is called after OnActivateView and where CRect parameters are available?

Thank you in advance

jmkhael30-Sep-02 6:02

30-Sep-02 6:02

Why dont u do all this work in OnDraw??

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

RuiSantiago30-Sep-02 6:25

30-Sep-02 6:25

Well, i'm a beginner and, I want to execute the following piece of code just after OnActivateView. I am not sure about OnDraw(). I tried placing the code in OnDraw() but I got a flickering screen.

CRect myRect;
CSize mySize;

GetClientRect(&myRect);

if (myRect.bottom<=y) //y is the vertical position of my last object
{
myRect.bottom+=200;
MoveWindow(&myRect, TRUE);
mySize=myRect.Size();
SetScrollSizes(MM_TEXT, mySize);
GetParentFrame()->RecalcLayout();
}

What am I doing wrong?

Thanks for your trouble.

jmkhael30-Sep-02 6:35

30-Sep-02 6:35

u are flickering i guess cos
MoveWindow( LPCRECT lpRect, BOOL bRepaint = TRUE );

This means that ur sending a WM_PAINT message froom within the OnDraw, try changing it to FALSE

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

RuiSantiago30-Sep-02 6:58

30-Sep-02 6:58

I tried that, with and without GetParentFrame()->RecalcLayout();
And in none of those ways i got satisfactory results.

I'm doing like :

void CStocks::OnDraw(CDC* /*pDC*/)
{
CRect myRect;
CSize mySize;

GetClientRect(&myRect);

if (myRect.bottom<=m_iLastY)
{
myRect.bottom+=500;
MoveWindow(&myRect, FALSE);
mySize=myRect.Size();
SetScrollSizes(MM_TEXT, mySize);
//GetParentFrame()->RecalcLayout();
}
}

After OnActivateView is finished, i have the final value for m_iLastY, and then iwant to use it to resize, is there an alternative to OnDraw?

Am i doing something wrong?

Thank again

jmkhael30-Sep-02 7:44

30-Sep-02 7:44

Check void ResizeParentToFit( BOOL bShrinkOnly = TRUE ); guess it could help u

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

RuiSantiago1-Oct-02 0:53

1-Oct-02 0:53

Thanks again Papa!

But i don't think i must use OnDraw, i just want to find a way of calling some code after OnActivateView is finished.

Is that possivel?...I even thougth on using timers...

Thanks

CFile and read

ns30-Sep-02 5:43

30-Sep-02 5:43

First I dont see a flag or anything telling CFile::Read that its reading binary data, and not text. I read a binary file into a char*a: I need to know, knowing the length of the cFile object thats been opened, what size to make a:

say nSize (from GetLength) is n. Then do I say

a = new char[n+1];

or

a = new char[n];

When I read text data in, I have to put a[n] = 0; to null terminate it. DO i do the same in case of a binary file?

Thanks,
ns

Re: CFile and read

jmkhael30-Sep-02 5:52

30-Sep-02 5:52

ur binary file already contains NULL chars in it, so why add one??

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: CFile and read

jmkhael30-Sep-02 5:58