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You can use also of Winexec or ShellExecute
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Hello,
I was looking at the Video For Windows API. Now I saw the VideoNet tutorial(Gnereral C++ -> Internet -> Peer to Peer) for Video Conferencing. Now to actaully start capturing video frames we use capCaptureSequenceNoFile(m_capwnd)Funtion where m_cpwnd is the driver name for the Webcam. Now I wanted to know what would be the driver name if I wanted to capture my desktop or more importantly to capture a paticular window?
Thanks in advance
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When i am running the application it is crashing .
It is saying that error is at _BLOCK_TYPE_IS_VALID(pHead->nBlockUse).
When i debugged i found that it is crashing at delete[] m_tot.
Object m_tot is having a valid address.But the variables inside are having junk values.
m_tot is declared as TOT* m_tot = new TOT[size],where TOT is the class.
Plz help...its urgent
Thanks in advance.......
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You probably write outside the boundaries of another array whihc has for effect that you overwrite the begining of m_tot. Thus, you get this crash.
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Hello,
A CRecordset object is made whose table is opened after the object is constructed.I don't use Classwizard to make a class derived from CRecortdset.Directly in my class I have an object of type CRecordset.
Now I want to add records to the database for which I wrote an SQL statement using INSERT and
called the CDatabase method ExecuteSQL() which worked fine.
But Now if I want to insert a record whose data is in a variable then I am not able to do it.
How do I do it?
Thanks
Prithaa
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Im sorry do you want to update new record on database?
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I try to draw a line with mouse moves, similar to line-tool of MS Paint-Brush -
see my previous post any idea to draw this line for more.
http://www.codeproject.com/script/comments/forums.asp?forumid=1647&fr=151[^]
I have downloaded several samples, but all of them are incorrect in basic concept, because they all call update function InvalidateRect(0), RedrawWindow(0) etc - if so, there is no neccessary to use Rubber band tech, as my understanding, rubber banding should only update requied pixels (such as a line) and without touching others (right?).
//--- my MFC code is bellow,
//--- I only copy key code for idea.
CPoint ptStart,ptEnd;
BOOL bDraw=0;
OnLButtonDown(UINT nFlags, CPoint pt)
{
bDraw=1;
ptStart=ptEnd=pt;
}
void OnPaint()
{
CPaintDC dc(this);
if(bDraw)
{
CPen penB(PS_SOLID,10,RGB(0,0,0));
CPen*pPenOld=dc.SelectObject(&penB);
dc.MoveTo(ptStart);
dc.LineTo(ptEnd);
dc.SelectObject(pPenOld);
}
}
void OnMouseMove(UINT nFlags, CPoint pt)
{
if(bDraw)
{
CPoint ptT=ptEnd;
ptEnd=pt;
//erase
RenewLine(ptT);
//display
RenewLine(pt);
}
}
RenewLine(CPoint pt)
{
CDC*pDC=GetDC();
CPen penNull(PS_NULL,10,RGB(0,0,0));
CPen*pPenOld=pDC->SelectObject(&penNull);
UINT u=R2_NOT;
// UINT u=R2_XORPEN;
int iROP=pDC->SetROP2(u);
pDC->MoveTo(ptStart);
pDC->LineTo(pt);
pDC->SetROP2(iROP);
pDC->SelectObject(pPenOld);
ReleaseDC(pDC);
}
//ignore mouse up and capure etc.
Result is none of lines can be seen, what is wrong?
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Hi includeh10
includeh10 wrote: have downloaded several samples, but all of them are incorrect in basic concept, because they all call update function InvalidateRect(0), RedrawWindow(0) etc - if so, there is no neccessary to use Rubber band tech, as my understanding, rubber banding should only update requied pixels (such as a line) and without touching others (right?).
I wrote an application that displays multiple models (as boxes) and treats connections between them as rubber bands. I used InvalidateRect(), and although I acknowledge that the technique redraws more of the image than is necessary, I wouldn't go so far as to call it incorrect in concept. It does the job and is plenty fast enough to keep pace with mouse moves, even when there are many connections to redraw. It also seems to be the 'windows way'. I'm not sure how to get parts of the view updated without using invalidation.
I had some problems with flickering background rectangles in early versions, but solved this by using a memory device context and blitting to the view's device context.
Best Regards
Cliff
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if u have an image in size of 2000x2000 pixels at background, you will know what happends by calling InvaliadateRect(0) - even 0 is set as a small rect.
incorrect! definitely.
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I have got it work!
you are 100% incorrect!
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Oh well, it's good to score 100% now and again - it's normally just an aspirational target. 
I'm sorry that my reply was unhelpful and glad you have solved the problem.
What's the key to updating the view without invalidation?
Best Regards
Cliff
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didn't i ever already asked you to post your code sample within <pre></pre> tags when you ask or answer something ? 
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I tried to connect char myvar[] with + operator.
But it's not work.
This is my code.
// Connect 2 char variables.
char myvar1[]="Hello ";
char myvar2[]="World!";
char myvar3[]=myvar1+myvar2; // It's wrong.
Please help me to solve.
Thank you.
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toeh wrote: I tried to connect char myvar[] with + operator.
The word you are looking for is concatenate.
toeh wrote: char myvar3[]=myvar1+myvar2; // It's wrong.
Because no memory has been set aside for myvar3. Try:
char myvar3[13];
strcpy(myvar3, myvar1);
strcat(myvar3, myvar2);
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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You cannot concatenate C-style strings like that. Either use strcat() or a string wrapper class (std::string, CString, etc.)
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I tried to specify file name with CreateFile().
It requires char* only.
But I would like to form file name from string.
So I have to convert it to char* and take it into function.
Well, how can I convert string to char* ?
Thank you.
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Hello everyone,
I followed the steps for automating Excel using MFC, given in Microsoft's website. However, when I execute the program, then the dialog appears with the "Run" button. But when I click the button, it gives an error message saying "couldn't CreateDispatch() for Excel". What could be the problem here? Oh, and I just upgraded to Office 2003.
Regards,
Prashanth
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I am currently trying to write a program that plays multiple movies and allows the user to draw directly onto the screen while the video is playing. I would like it to persist throughout playback. I am kind of confused to what the best approach to do this would be. I am planning to use the QuickTime API for the video, I like the rendering better than WMP. I was looking for any advice on how to approach this. Should I use multiple views on one document or multiple windows overlayed with one another? Any and all advice is welcomed thanks.
Mike
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Do you mean draw on the video or elsewhere on the screen?
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Yes to draw on the video and have it persist without the video player redrawing that part of the screen.
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barrem wrote: Yes to draw on the video and have it persist without the video player redrawing that part of the screen.
The video player is redrawing at least the video portion of the screen/window at regular intervals.
You'll need to persist whatever is drawn somehow so that it can be redrawn on every frame of video
just before the frame is rendered. This will make it appear the smoothest. You could also redraw
the persisted drawings on the window right after every frame is rendered but this will flicker.
Either way, you need access to the frames of video or at least notification that a frame was just
rendered. I've never used the QT player (for development) so I don't know if you have access to
video at this level.
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I need to figure out if a HBITMAP/CBitmap has an alpha channel, but bitmap.bmBitsPixel is always 32, no matter if it's a 16-color bitmap or 24-bit+alpha channel bitmap.
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I don't think DDBs support alpha channel, at least not in the standard Windows APIs.
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