CFile and read - C / C++ / MFC Discussion Boards

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

Re: FormView override doubt

jmkhael30-Sep-02 6:02

jmkhael

30-Sep-02 6:02

Why dont u do all this work in OnDraw??

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: FormView override doubt

RuiSantiago30-Sep-02 6:25

RuiSantiago

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.

Re: FormView override doubt

jmkhael30-Sep-02 6:35

jmkhael

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 ) ;

Re: FormView override doubt

RuiSantiago30-Sep-02 6:58

RuiSantiago

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

Re: FormView override doubt

jmkhael30-Sep-02 7:44

jmkhael

30-Sep-02 7:44

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

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: FormView override doubt

RuiSantiago1-Oct-02 0:53

RuiSantiago

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

jmkhael

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

jmkhael

30-Sep-02 5:58

From the SDK: 'FILECORE.CPP'

BOOL CFile::Open(LPCTSTR lpszFileName, UINT nOpenFlags,
CFileException* pException)
{
ASSERT_VALID(this);
ASSERT(AfxIsValidString(lpszFileName));
ASSERT(pException == NULL ||
AfxIsValidAddress(pException, sizeof(CFileException)));
ASSERT((nOpenFlags & typeText) == 0); // text mode not supported

// CFile objects are always binary and CreateFile does not need flag
nOpenFlags &= ~(UINT)typeBinary;

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: CFile and read

ns30-Sep-02 6:05

30-Sep-02 6:05

Okay. That helps a lot.

Thanks,
ns

Write to Excel File ???

Nitron30-Sep-02 5:32

Nitron

30-Sep-02 5:32

Does anyone have any info on the Excel file format? Unsure | :~

I have large datasets Ineed to output to Excel, but when using ODBC or the CSpreadSheet class (I think this uses ODBC also), my sql statements get too big for a CString... Anyway, is there a better/faster way for Excel IO? Any input is appreciated (as always).

Nitron
_________________________________________--
message sent on 100% recycled electrons.

Re: Write to Excel File ???

Stephane Rodriguez.30-Sep-02 5:44

Stephane Rodriguez.

30-Sep-02 5:44

Searched CP before posting ?

Excel generator[^]

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Re: Write to Excel File ???

Nitron30-Sep-02 6:01

Nitron

30-Sep-02 6:01

StephaneRodriguez wrote:
Searched CP before posting ?
Um... Unsure | :~

Thanks Stephane Rose | [Rose]

Nitron
_________________________________________--
message sent on 100% recycled electrons.

Re: Write to Excel File ???

TyMatthews30-Sep-02 6:23

TyMatthews

30-Sep-02 6:23

Have you looked at DTS at all? It can output to Excel without you having to write a bunch of code. You can load DTS packages in your EXE and run them from there, since DTS is really just a collection of COM objects.

If that is too much of a burden, or your data doesn't already exist in some other database for easy export, then take a look at the MSDN sample COMEXCEL. It shows how to use the Excel.Application.8 COM object, which gives you direct access to Excel and all its glory. Okay, maybe not all, but a bunch of stuff. You can create new workbooks, spreadsheets, data ranges, etc. and you can write out all of your data. Just note in this case, you'd need to have Excel installed on the same machine where your code will run.

Ty

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them." -Albert Einstein

MultiSelect CFileDialog (Open)

ns30-Sep-02 5:14

30-Sep-02 5:14

According to MSDN for CString GetPAthNAme():

If m_ofn.Flags has the OFN_ALLOWMULTISELECT flag set, this string contains a sequence of null-teminated strings, with the first string being the directory path of the file group selected, followed by the names of all files selected by the user.

Now if I assign the result of calling GetPathName(), the CString I assign it to only reads in upto the first null. So how to I get a hold of the complete list of files returned by getPAthNAme()?

CString a = dlg1.GetPAthName();

and its multiselect....

Thanks,
ns

Re: MultiSelect CFileDialog (Open)

Ravi Bhavnani30-Sep-02 5:17

Ravi Bhavnani

30-Sep-02 5:17

Use GetStartPosition() and GetNextPathName() to iterate thru the list of names.

/ravi

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

Re: MultiSelect CFileDialog (Open)

jmkhael30-Sep-02 5:17

jmkhael

30-Sep-02 5:17

Read about:
GetStartPosition and GetNextPathName

hint: u get a position from the first, u put it into the other!

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: MultiSelect CFileDialog (Open)

Lakitu30-Sep-02 5:17

Lakitu

30-Sep-02 5:17

You have to use GetStartPosition() and GetNextPathName() to iterate through the list of files.

If a train station is where the train stops, what's a workstation...?

Thanks everyone!!!

ns30-Sep-02 5:26

30-Sep-02 5:26

I got misled by MSDN (my fault)....thanks for pointing me in the right direction...

Thanks,
ns

show text in statusbar

jafrazee30-Sep-02 4:43

jafrazee

30-Sep-02 4:43

i need to show text in my status bar to show a process working and what is happening.
the problem is i have no idle time to update the status bar.

how can i update the status bar without stopping my code?. (or can i?)

Re: show text in statusbar

Jon Hulatt30-Sep-02 5:09

Jon Hulatt

30-Sep-02 5:09

If you have no time to update your status bar, you have a more underlying problem with cpu usage. your app is going to be totally unresponsive. If someone obscures it with another window, and then hides that window, your app is not going to redraw.

This creates a poor user experience and they'll think your app has crashed.

Consider putting your intensive code in a worker thread, and leave the main thread free to pump messages, and update the UI.

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Re: show text in statusbar

jafrazee30-Sep-02 5:18

jafrazee

30-Sep-02 5:18

my program imports or scans images and preforms icr on the image and archives that image to a drive or cd.

i can also do all this in less that 1 sec.

my program does lots in little time. some scan session will scan over 5000 documents without crashes.

all i need to know if a statusbar can be forced to update.

Re: show text in statusbar

Jon Hulatt30-Sep-02 5:37

Jon Hulatt

30-Sep-02 5:37

In short, no, you can't update the status bar. To update the status bar, at the end of the day, involves sending a message to the status bar itself. There will be no cpu timeslice for that to happen if your one and only thread is blocked.

That is the perfect case for a worker thread. If your user was doing a batch of 5,000 documents each taking 1s, he's going to be waiting a long time. you need to give him a cancel button- and you can't handle the click of the button if your main thread is busy doing scanning.

someone else please back me up on this! or point me out if i'm wrong.

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Re: show text in statusbar

jafrazee30-Sep-02 6:25

jafrazee

30-Sep-02 6:25

actually i have 2 threads. one for scanning or importing and the other for icr and saving.
as thread 1 scans the other processes the prev image (if still in the buffer).
i have a window for the scanner that pops up and there is a cancel button. it all works great the scanner will usally have to process the log that is ready to scan before it stops but i do not have any idle time to have the status bar update when ever.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.