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I've got quite weird problem. From the main dialog I create a modal dialog where I make some computations and display results using OpenGL. I set Timer and when I get WM_TIMER message I redraw this dialog's window using RedrawWindow(). The problem is one time I create this dialog it works fine from the begining to the end. But when I try to do it again it doesn't get visually redrawn at all. I've placed different checks in my code. They have shown that in this dialog's lifecycle OnPaint func succesfully gets entered numerous times where I perform all the drawing. But I don't see any result. The problem arises on Win9x only. In 2k/XP everything goes perfect. Note that I don't only test it on Win9x but compile it's own variant too. So I need your help.
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Invalidate() (optionally followed by UpdateWindow() if you want the redraw to happen immediately) should cause a repaint.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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It still doesn't work. Here's a scheme:
// Main.cpp
void CMainDialog::On_Visualize() // Create a modal dialog
{
...
OpenGL_Dialog my_gl;
my_gl.DoModal();
...
}
// OpenGL_Dialog.cpp
BOOL OpenGL_Dialog::OnInitDialog() // Setting timer when creating dialog
{
CDialog::OnInitDialog();
...
draw_counter=0;
SetTimer(1,10,NULL);
}
void OpenGL_Dialog::OnDestroy() // Kill timer when destroying
{
...
KillTimer(1);
CDialog OnDestroy();
}
void OpenGL_Dialog::OnPaint()
{
draw_counter++; // check
CPaintDC dc(this);
DrawGLScene2D;
SwapBuffers(m_hgldc);
}
void OpenGL_Dialog::OnTimer(UINT nIDEvent)
{
switch(nIDEvent)
{
case 1:
RedrawWindow();
break;
...
}
CDialog::OnTimer(nIDEvent);
}
void OpenGL_Dialog::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch (nChar)
{
case 32:
char buf[10];
itoa(draw_counter,buf,10);
AfxMessageBox(buf);
break;
...
}
CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}
Something like this. I wouldn't actually have placed drawing handling on timer but I need to respond to user input and other stuff. So striking space during the dialog's lifecycle I get the number of redrawings and this number is growing all the time. But in most cases the screen stays blank and nothing is drawn.
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Replace RedrawWindow() with Invalidate(). Add a TRACE() statement just before the call to Invalidate() to ensure the case is executing.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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When I insert VB ActiveX into a form (in VC++ for example) I have a problem with message boxes, which pop up when some event occurs. But my message boxes are not modal (I set vbApplicationModal). What do I have to do ?
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Search for the following items:
WM_DROPFILES
DragAcceptFiles()
DragQueryFile()
MSDN Article titled "Transferring Shell Objects with Drag-and-Drop and the Clipboard"
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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When one creates a drop down menu using the resource editor, it is possible to specify that a menu item is "checked", allowing one to have a check mark appear (or not) on the item when the menu is dropped down.
I would like a tri-state check mark. The check mark is either present, not present, or "greyed".
If I call pCmdUI->SetCheck(2), where pCmdUI is the CCmdUI* pointer passed to the "UI Update method", it causes the check mark to be drawn just as passing the value 1 would. The documentation indicates that the value 2 indicates an indeterminate state (the tristate).
Do I need to somehow intercept the menu being activated, and then change some kind of style mask on the menu items?
Any suggestions or example code would be appreciated.
Thanks
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Hi
Is there any method of drawing circles and points with float values.
I am drawing a series of circles and points on my view. (A scientific application)
I am using SetPixel and Ellipse methods to draw point and circles respectively.
Every thing is working fine, but to the application context when we analyse further that series of holes have to be closer i.e. at one end all holes circumference must overlap and just give a shape like all circles are connected at that point.
Circles are generally one inside other. i.e. bigger outside and then smaller inside.
But it instead of showing holes closer it shows them somewhat wider.
I thought this might be due to holes i am plotting with int values.
Thats why this thought that if holes drawn with float to check whetehr it corrects the problem i am facing.
Sandeep
Leave your mark wherever you go
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Is there a simple way intercept all keyboard messages sent to buttons in my dialog and process them myself? I really don't want any keyboard input in my dialog, and I want the dialog to be able to recieve arrow key presses. Is there a simple way to do this without subclassing each control?
Joel Holdsworth
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Have you looked at OnSysKeyDown(), OnKeyDown(), and OnChar()?
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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Yes... Problem is that when my dialog controls have the focus, then they seem to eat all the keyboard messages!
Joel Holdsworth
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I got a simple DOS app. primary school slash hello world slash newb kind of app.
So the thing is, an ofstream opens a file then writes a string, just a word derived from user thru cin >> word; then closes it.
Now I need this file to be reopened later in the loop and writen to again while preserving the old data. Tried outFile.open("filename", ios::ate) to force the file pointer to the eof, but can't make work. I am prety sure that is wrong anyhow.
What is the right way to do it?
Oh, by the way, there must be a way to keep user inputs in some sort of list inside the program code without rellying on ofstreams. Can someone tell me what parts of C++ handles that sort of stuff, just a name would be OK.
Thanks for reading this long ass post!
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How can I view a file with an external viewer from within my application? I know I could use the "system" command, but then I have to give the path to the external viewer, but what when I don't know the path? I mean if my application needs to view a html page I could give a path to netscape or IE, but what if there is not one of them at the system because the user only installed opera? Is there a quick and easy way to access the windows default viewer for the different fileformats? You know if you doubleclick on a file windows starts an application for viewing or editing that fileformat. Is there a command to do that easiely in a VC++ project?
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Have a read of ShellExecute on MSDN. Or do a google for some examples.
Michael
CP Blog [^]
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Thanks a lot! I managed to solve my problem. 
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Hello all,
I have a problem figuring out how to start a service more than once at a time.
it seems to be posible, but all my tries to date have failed.
Could anyone help me with this problem?
in advance, thanks
Michael Olsen
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Michael Olsen wrote:
Could anyone help me with this problem?
A Windows service by its very nature can only be run once. You'd have to have a different service name for each instance you want to run.
Why do you want to have multiple instances of a service?
Michael
CP Blog [^]
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Thanks for the reply.
The service is a kind of router, and with multiple instances more customers could be serviced (on diferent ports) without mixing. like acidentialy sending data to another customer.
I had hoped this could be done by starting the same service multiple times listening to different ports.
Michael Olsen
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Michael Olsen wrote:
I had hoped this could be done by starting the same service multiple times listening to different ports.
I'm no expert on this, but I think the "correct" way would be to have one service that has multiple threads. One thread per port.
Michael
CP Blog [^]
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There is a question about the API fuctions,which are CreatePolygonRgn() and PtInregin().
When I used CreatePolygonRgn() to create a closed regin, which is surrounded by any closed curve, and then used PtInregin() to judge the points whether in the closed regin, there is a question arised. the left edge of regin is judged out of then regin,and the right edge is judged in the regin. they are contrary. I want to ask this question whether caused by the CreatePolygonRgn(). SOS ! Waits!
go on,next...
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help!
go on,next...
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HI ,
I want ot set Hot keys in my Application .
example as when press Ctrl+P = Play a file method call.
I think use Accelerator here.. is it ..
But how , and where i can trap these keys .
to do action that i want
any sample??
thanx
Regards.
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Yes you use accelerators for this. You set message handlers to accelerator in the same way you set message handlers to menu items.
Ant.
I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)
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