C / C++ / MFC

Re: is it possible to update a specific column in listview?

1-Jul-13 16:37

I have a list view with ownerdata and custom draw. when i do listview_update it updates the list but what If I want to update a specific column instead of all cols?

-----------------------
| col1 | col2 | col3 |
-----------------------

just col1 i is that possible?

David Crow2-Jul-13 2:49

David Crow

2-Jul-13 2:49

Why not update the data that is used to populate the list? Then when the list is refreshed, the new values will be shown.

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CFile reads comma delimited text automatically?

Vaclav_1-Jul-13 13:03

Vaclav_

1-Jul-13 13:03

I have decided to simplify my database using plain text files.
So this is my first usage of MFC CFile and I am wondering why CFile → Read reads only up to the first comma it finds in the text file irregardless how many bytes it suppose to read.
Is that by design or did I missed something?
Thanks for you help.
Cheers
Vaclav

Re: CFile reads comma delimited text automatically?

SoMad1-Jul-13 14:47

SoMad

1-Jul-13 14:47

I am pretty sure you are doing something wrong, perhaps you can share some of your code with us. CFile is for generic, binary file handling and does not care which characters you read and write.

You might consider using CStdioFile instead - it operates on files in text mode and provides a ReadString()[^] method, which makes it simple to read a text file line-by-line.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Re: CFile reads comma delimited text automatically?

Vaclav_2-Jul-13 4:04

Vaclav_

2-Jul-13 4:04

Soren, thanks for your help.
Here is the read code.
I did add \n after the comma to the write text.
The file as around 230 bytes, ten string entries (sample "WS2EEE,\n") and even with the iReadBytes set to 250 it get only the first string with comma attached.
I am also having some problems with using Seek to next "record", but I can work on that later.
I was hoping to read the entire file and than process it , but I'll try the CStdioFile and read one line instead.

char pbuf[1000];
UINT nBytesRead;
UINT iRunningTotal = 0;
CString strField, strExcluded;
int iReadBytes = 250;
do
{
nBytesRead = pFile->Read( pbuf, iReadBytes );
TRACE("\nBuffer %s", pbuf);
// extract to delimiting comma
strField = pbuf; // kluge need to learn how to use CString buffer
strExcluded = strField .SpanExcluding( ";,.- :");
int iLenght = strExcluded.GetLength();
iReadBytes = iLenght + 2;
pFile->Seek(iLenght +1 ,CFile::current);
iRunningTotal += nBytesRead;
}while ( iRunningTotal < dwFileLength);

Re: CFile reads comma delimited text automatically?

David Crow2-Jul-13 4:09

David Crow

2-Jul-13 4:09

Change your loop to:

CString strLine;
while (file.ReadString(strLine))
{
    // parse strLine as necessary.
    // if each line has same number of delimeters, consider AfxExtractSubString().
}

Re: CFile reads comma delimited text automatically?

SoMad2-Jul-13 20:44

SoMad

2-Jul-13 20:44

Sorry for the delay Vaclav, it has been one of those days.

I think you should do this with CStdioFile and get the text parsing all straightened out first. Follow David's advice for the read loop.

If you still want to do some testing with your current code, you need to clean up some things. You say you hope to read the whole file in and then process it. Well, then that is what you should do instead of doing both reading and processing in the loop.

I will recommend you use a CByteArray for the read buffer (I like its flexibility). Use CFile to check the size of the file, call SetSize() on the CByteArray object with that value, read the file in a single call (for now let's just assume your files will not be too large for that) and close the file. Then you use the loop to go through the buffer without doing anymore file handling.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Getting the Command Line of Another Process

Richard Andrew x641-Jul-13 10:58

Richard Andrew x64

1-Jul-13 10:58

Does anyone know a documented way to retrieve the command line of another process?

The difficult we do right away...
...the impossible takes slightly longer.

Garth J Lancaster1-Jul-13 12:47

Garth J Lancaster

1-Jul-13 12:47

documented ? by whom ?? - good luck

I know of no 100% foolproof way - the one way I do know of, is itself dangerous and uses CreateRemoteThread() (yes, its c++), and injects code into the running process.

The last time I needed to do this, I ended up writing a stub program with the same name of the exe I was trying to figure out (because the 3rd party involved themselves didnt know the some parameters they were passing into it dynamically, it was legacy code) - so my stub simply dumped the parameters to a log file - at least I had enough access to the system to be able to replace their exe temporarily

please let us know if you find something Richard

'g'

Richard Andrew x641-Jul-13 13:14

Richard Andrew x64

1-Jul-13 13:14

Thanks for your answer. I was afraid of that. Laugh | :laugh:

The difficult we do right away...
...the impossible takes slightly longer.

Garth J Lancaster1-Jul-13 13:18

Garth J Lancaster

1-Jul-13 13:18

sorry

this http://win32.mvps.org/processes/remthread.html[^] seems to be a summary of the 'best' way of doing it - billions of caveats apply

'g'

David Crow2-Jul-13 2:56

David Crow

2-Jul-13 2:56

See if this helps.

Resize bitmap from Clipborad?

Richard Andrew x642-Jul-13 10:15

Richard Andrew x64

2-Jul-13 10:15

That's a big help, thanks. Smile | :)

The difficult we do right away...
...the impossible takes slightly longer.

JoneLe8630-Jun-13 12:16

30-Jun-13 12:16

What I am up to is resizing the bitmap from the clipboard then re send it to clipborad so it's kinda easy in VB take a look

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    My.Computer.Clipboard.SetImage(New Bitmap(bmp, CInt(bmp.Width / 2), CInt(bmp.Height / 2))) ' resized and pasted to Excel
End Sub

No how to do this under C?

So i can send the bitmap to the clipboard with these instructions

C++

OpenClipboard(NULL);
EmptyClipboard();
SetClipboardData(CF_BITMAP, Hbitmap);
CloseClipboard();
OpenClipboard(NULL);

and for bringing it

C++

HBITMAP hbitmap = (HBITMAP)getclipboardData(CF_BITMAP)

and i know that I should use

C++

StretchBlt()

but i do not know how to accomplice that?

thanh_bkhn30-Jun-13 20:53

thanh_bkhn

30-Jun-13 20:53

Assume you have a HBITMAP hbitmap which already contains your clipboard data. Then you can StretchBlt that data to a destination HDC hdc as below:
1. Create a compatible HDC in memory with your destination hdc

HDC memDC= CreateCompatibleDC(hdc);

2. Select your hbitmap into the memory DC

HBITMAP hOldBmp = (HBITMAP)SelectObject(memDC, hbitmap);

3. Use StretchBlt to resize it

StretchBlt(hdc, 0, 0, new_Width, new_Height, memDC, 0, 0, org_Width, org_Height, SRCCOPY);

4. Restore the old bitmap and free memory

SelectObject(memDC, hOldBmp);
DeleteDC(memDC);

Hope it helps Smile | :)

JoneLe861-Jul-13 9:53

1-Jul-13 9:53

Thanks it helped me Smile | :)

Jochen Arndt30-Jun-13 21:01

Jochen Arndt

30-Jun-13 21:01

You may use the CopyImage()[^] function:

C++

BITMAP bm;
GetObject(hBitmap, sizeof(bm), &bm);
HBITMAP hCopy = (HBITMAP)CopyImage(hBitmap, IMAGE_BITMAP, 
    bm.bmWidth / 2, bm.bmHeight / 2, 
    LR_COPYDELETEORG);
SetClipboardData(CF_BITMAP, hCopy);

JoneLe861-Jul-13 9:53