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Ive managed to read a whole text file into a string. The text file has 200 lines. I wanna read a specific line from the string, how can i do it? I tried getline(); but the problem is that it reads a line rite from the starting position of the string but not from a specific point.
nOmI
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Well, you may read a line at time or may move a pointer inside the buffer.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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kindly would u like to elaborate ur reply bcoz im a bit new in C++ programming.
nOmI
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Instead of reading the whole file at once, read it one line at a time until you get to the desired line. Otherwise, you'll need to parse the buffer (a line will by separated by a \r\n pair).
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Thank you for elaborating my lazy answer.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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CPallini wrote: Well, you may read a line at time or may move a pointer inside the buffer.
And you got 1 vote at time but now you get a pointer of 5.
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Thank you, pal.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Did you try with CFile::Read ?
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This function takes two parameters
1. first one is the path of file to be read.
2. second parametrs is the line number you want to get from the file.
CString GetLine(CString sFileName, int nLineNumber)
{
CStdioFile Inputfile;
CString sLine = _T("");
CFileException FileExc;
UINT nOpenFlags = CFile::modeRead;
if (!Inputfile.Open(sFileName, nOpenFlags, &FileExc)) {
FileExc.ReportError();
return "Error";
}
while(Inputfile.ReadString(sLine) && nCount < nLineNumber){
nCount++;
}
Inputfile.Close();
return sLine;
}
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You may open the text file using "CStdioFile",
the read each line using ReadString().
Actually ReadString () reads each line at a time !!
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Hi,
I have Parent and child windows, when i create new child windows it adds them,
but when i move them or bring one from the back it doesnt redraw properly,
i was wondering if there was a way i could redraw those windows properly,
and if that doesnt work im assuming that its probably cause each child is
sharing the same WndProc, is there a way to make the WndProc and array...
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Are you returning the correct value when processing WM_PAINT messages?
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well as im fairly new to child forms I dont know what value i should be returning
ive tried
UpdateWindow(hWnd) in case WM_ACTIVATE:
but that didnt really do anything,
its when i put another child window infront of another and click on the one behind it doesnt redraw and half the window is missing
i really dont ahve a clue how to sort that
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well before that i found a semi way of sorting my problem but it caused tremendous flickering
case WM_PAINT:
{
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint( hWnd, &ps );
InvalidateRect(hWnd, NULL, TRUE);
UpdateWindow(hWnd);
EndPaint( hWnd, &ps );
}
return 0;
break;
i even tried
but im still having no luck
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No no no!
The call to InvalidateRect() triggers the generation of a WM_PAINT message so that definately needs to come out.
UpdateWindows() does the same but the window procedure is called rather than letting the message run through the normal message queue so that call also needs removing.
The code you've shown doesn't actually do anything so I'm not surprised the window doesn't change on screen. Is that it or have you removed the painting code to make things clearer?
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I wish i could paste a picture in here lol
I removed those lines and im aware that the paint method i have set doesnt do anything
but even without the WM_PAINT and using the updatewindow etc it still causes overlapping and no redrawing
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no, i tried that at one point and all the windows when they gained focus just passes under the background of the other child windows, its very weird
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What Steve meant to say was NO NO NO!!
You're causing infinite recursive WM_PAINT messages there.
Sarriss wrote: but even without the WM_PAINT and using the updatewindow etc it still causes overlapping and no redrawing
No redrawing will be done unless you do some drawing.
If you call BeginPaint/EndPaint without doing any drawing, then
even if you pass the message to the default window proc, nothing
will happen.
You need to either draw the window contents or let the default
window proc draw the window contents in response to WM_PAINT.
Of course, you can always let the default window proc do its drawing
then draw on top of that if you'd like.
Just don't call any invalidate/update/redraw window functions from your
WM_PAINT handler!! All those messages cause WM_PAINT messages.
Mark Salsbery
Microsoft MVP - Visual C++
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Yeah I noticed that after I tried it,
eitherway I still need help with WM_PAINT, im still trying to get it so when i bring it as the focus window it redraws and doesnt leave half of the window with the image of the window that was infront of it
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Sarriss wrote: im still trying to get it so when i bring it as the focus window it redraws and doesnt leave half of the window with the image of the window that was infront of it
Did you specify NULL for the background brush in the window class?
If so, you are responsible for drawing the window background yourself.
The system will give you the messages - you just need to
respond to them correctly.
I would start simple - do nothing in your window proc except call the
default window proc. If that doesn't work right then you haven't
implemented your window proc correctly.
Then maybe add in a simple WM_PAINT handler:
case WM_PAINT:
{
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint( hWnd, &ps );
EndPaint( hWnd, &ps );
}
return 0;
break;
Mark Salsbery
Microsoft MVP - Visual C++
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no the background brush was not null thats what is confusing me, there is a background but its dont redrawing anything properly
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If the background brush is null then nothing will draw in the client
area of the window unless YOU draw it. You can do that in response to
the WM_ERASEBKGND (typically) or WM_PAINT message.
Mark Salsbery
Microsoft MVP - Visual C++
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am i being thick or is it no one is understanding me
I have a background
I have child windows
how do i force them to redraw when i set the focus
the imprint of the form that sits infront of the one i click, is still there, its a refresh problem,
can anyone please just tell me the code to just redraw/refresh the whole lot.
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