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This works:
char* CFindInWindowDlg::GetTextLinesBuffer()
{
CString allText = "";
for (int a = 0; a < numLines; a++)
{
allText += lines[a].GetBuffer(0);
lines[a].ReleaseBuffer();
}
return allText.GetBuffer(0);
}
Any idea why I need to use GetBuffer instead of string1 += string2?
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c121hains wrote:
This works:
char* CFindInWindowDlg::GetTextLinesBuffer()
{
CString allText = "";
[...]
return allText.GetBuffer(0);
That may seem to work, but it actually doesn't. You can't return a pointer to the internal buffer in allText, since that variable will be destroyed as soon as the function terminates.
Check the code I suggested in a previous post (the function receives a CString reference from the caller and stores the result in it).
c121hains wrote:
Any idea why I need to use GetBuffer instead of string1 += string2?
You don't need to use GetBuffer; that's not the problem.
--
jlr
http://jlamas.blogspot.com/[^]
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A classic case of "MFC must be broken because my code works just fine."
Wrong.
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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Try this:
CString strAll = lines[0] + lines[1] ...
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I tried that but it didn't work.
Here is an example of what happens:
string1 = "this is a string \r\n";
string2 = "this is an appended string \r\n";
string1 += string2;
string1 still equals "this is a string \r\n" and doesn't append string2!!
I need those '\r' and '\n' characters. By putting them all into a char string, it fixes this problem.
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In the debugger.. There is no change to the original string:
originalString = "the original string \r\n";
originalString += "a new string \r\n";
------
originalString still equals "the original string \r\n";
Do you get a different result?
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It should work. Maybe the debugger is showing only the first line. Try doing a TRACE() and see the result in the output window.
--
jlr
http://jlamas.blogspot.com/[^]
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This works:
char* CFindInWindowDlg::GetTextLinesBuffer()
{
CString allText = "";
for (int a = 0; a < numLines; a++)
{
allText += lines[a].GetBuffer(0);
lines[a].ReleaseBuffer();
}
return allText.GetBuffer(0);
}
Any idea why I need to use GetBuffer instead of string1 += string2?
|
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This works:
char* CFindInWindowDlg::GetTextLinesBuffer()
{
CString allText = "";
for (int a = 0; a < numLines; a++)
{
allText += lines[a].GetBuffer(0);
lines[a].ReleaseBuffer();
}
return allText.GetBuffer(0);
}
Any idea why I need to use GetBuffer instead of string1 += string2?
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Well, that only "works" by chance. You're returning a pointer to the local variable allText which immediately goes out of scope.
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | 1ClickPicGrabber | NEW~! CP SearchBar v3.0 | C++ Forum FAQ
I even hear the Windows "OMG I booted up fine" sound.
-- Paul Watson diagnosing hardware problems.
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c121hains wrote:
All i want to do is get all of the text together from an array of CString objects and put it into a single char* pointing to a string.
Try this:
void MergeLines(const CString* lines, int nLines, CString& result)
{
int nTotalLength = 1;
for (int i = 0; i < nLines; i++)
nTotalLength += lines[i].GetLength();
result.Empty();
result.GetBuffer(nTotalLength);
result.ReleaseBuffer();
for (int i = 0; i < nLines; i++)
result += lines[i];
}
Disclaimer: I didn't compile it. May contain some error[s].
--
jlr
http://jlamas.blogspot.com/[^]
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This works:
char* CFindInWindowDlg::GetTextLinesBuffer()
{
CString allText = "";
for (int a = 0; a < numLines; a++)
{
allText += lines[a].GetBuffer(0);
lines[a].ReleaseBuffer();
}
return allText.GetBuffer(0);
}
Any idea why I need to use GetBuffer instead of string1 += string2?
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c121hains wrote:
Any idea why I need to use GetBuffer instead of string1 += string2?
Ok. I already answered this.
Again, I suggest you try the implementation I posted before.
--
jlr
http://jlamas.blogspot.com/[^]
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Hello,
if I use AfxBeginThread() function to start a thread, how do I check if it's still running or has already exited?
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Normally you shouldn't care. What exactly is it that you are attempting to do?
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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I have a thread that plays a sequence of images. In the CDocument I handle controls to pause/play using events and boolean variables. I chose start the thread inside play() function. The way I handle pause() I don't care if the thread is there or not. However if the user presses play again, I don't want to start another thread, I want to continue the previous one.
I have the option of making a thread that runs for the life of the CDocument...but wouldn't that be wasteful when it sits there and waits on pause forever after a single play.
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Also I should clarify currently the thread goes through the sequence of images and quits. So next time inside play() I need to know whether to resume the current thread or start a new one.
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See here for details on how to properly pause and stop threads.
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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Yes, that's what I use. Taken from the site:
<br />
while(running)<br />
{ <br />
if(paused)<br />
switch(::WaitForSingleObject(event, time))<br />
{<br />
case WAIT_OBJECT_0:<br />
break;<br />
case WAIT_TIMEOUT:<br />
continue;<br />
}<br />
} <br />
except instead of while(running), I have a for loop from 0 to numImages.
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Budric B. wrote:
but wouldn't that be wasteful when it sits there and waits on pause forever after a single play.
Not neccessarily. Or at least I wouldn't think so if you're using WaitForSingleObject() to do the "waiting" and not a busy wait while loop.
¡El diablo está en mis pantalones! ¡Mire, mire!
Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!
SELECT * FROM User WHERE Clue > 0
0 rows returned
Save an Orange - Use the VCF!
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Jim Crafton wrote:
...if you're using WaitForSingleObject() to do the "waiting" and not a busy wait while loop.
Correct. WaitForSingleObject() uses no CPU time while waiting for the object state to become signaled or the time-out interval to elapse.
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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AfxBeginThread returns the pointer of the created thread CWinThread.
Using BOOL GetExitCodeThread( HANDLE hThread, LPDWORD lpExitCode); you can get the status of this thread (STILL_ACTIVE if it's not terminated).
Marc Soleda
... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.
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Hi,
I have developed real time file monitoring using Device driver ( with .sys & .vxd file), if i have changed the driver name and file name, i got error message
" Overlapped I/O operation is in progress".
can u help me?
Regards,
Inbha.
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If call function and I want that function work not more than 3 sec.
how can force to softly exit from it if 3 sec expires.
Function not in my code I need somthing similiar to SendMessageTimeOut(...)
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