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Have a look at overlapped i/o (the last param in createfile , readfile etc).
You can then wait on events (read happened, thread should die, etc) in your worker thread.
Them when something interesting has been sent by the GPS unit, you can assemble it in your thread, and use PostMessage to kick your UI thread...
I know that's a short version....
Iain.
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Thanks,
I've already tried the overlapped IO, so I guess I should use WaitForMultipleObjects: 1. the read complete and 2. the thread ends, etc.? I'm thinking that just waiting for a single object (the read happened) would still hang up?? Or will WaitForSingleObject@0mS in some kind of loop work?
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What I've done is:
HANDLE hEvents [2];
...
hEvent [0] = Overlapped.hEvent;
hEvent [1] = hBailFromThread;
dwWait = WaitForMultipleEvents (hEvent, 2, INFINITE);
if (dwWait == WAIT1)
{
tidy up
return
}
do stuff ()
loop back.
and so on.
and to kill the thread:
SignalEvent (hBail);
WaitForSingleEvent (hThread, sensibletime);
etc.
I hope thatb helped a little.
Iain.#
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Gracious thanks for the quick replies. That makes sense (I think  ) and I'm going to give it a go tomorrow. I'll note if I get it working...
Mike
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Hi all
I have such code :
...
__int32 x = 0;
char *str = "1234";
x = (str[0],str[1],str[2],str[3]);
...
What will be the value of x and why ?
thank you in advance
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Thanks for reply Mike, but it is not a homework.
I also know that x will be 52, but why ?
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Look up how the comma operator works.
0 bottles of beer on the wall, 0 bottles of beer, you take 1 down, pass it around, 4294967295 bottles of beer on the wall.
Awasu 2.2 [^]: A free RSS/Atom feed reader with support for Code Project.
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I got the following problem: I got a DC in which I need to put an image comprised of more bitmaps. However, if I paint the bitmaps one by one, I get some flicker.
So I need 1 memory DC to paint the bitmaps with. 1 memory DC to paint them in. And then this last memory DC will get bitblt-ed on the third and real DC.
But the problem is that when I can't paint from the first DC to the second. I select the bitmaps in the first DC and bitblt them in the second. But when I do my stuff and bitblt the second DC upon the third, I get only white. Anybody got any clue what I'm messing up here?
I didn't include code 'cause my routine is rather complicated and it's not written in C++ but here is something that may be of use:
1. I create both memory DCs using "CreateCompatibleDC(REALDC)".
2. I select bitmaps in the first DC using "SelectObject (hdcMemory, myBITMAP)".
3. I simply bitblt from first DC to second DC at the desired coordinates.
4. I repeat steps 2. and 3. for 4 images, bitblt-ed at various coordinates within the second DC.
5. Now I bitblt the second DC in the real DC, the third one, the visual source.
All is white................
-= E C H Y S T T A S =-
The Greater Mind Balance
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can u BitBlt() first memory DC to real DC properly?
default size of memory DC is 1x1 pixels.
did u set suitable size for all other memory DCs?
A special image tool for C++ programmers, don't miss it!
The world unique Software Label Maker is here for you and me ...
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I can't paint directly to the real DC 'cause I need to put more images. So I need an intermediate DC in which to dump the pictures piece by piece and then bitblt in the original DC.
I set the size of the memory DC by selecting a bitmap of the desired size in it. Is that correct.
-= E C H Y S T T A S =-
The Greater Mind Balance
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I don't know what you're trying to suggest here and I don't think I'm gonna like the sound of it. But please, give it a shot ::- ).
-= E C H Y S T T A S =-
The Greater Mind Balance
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Not a direct reply, but you should look at Image Viewer Utility[^] by PJ Arends. It should help you a lot while debugging the problem.
My guess is that you have incompatible bitmaps selected into your DCs.
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Hi
I'm drawing a bitmap in the client area. However, after restoring from being minimized the client area is not repainted (non client area is shown). My guess is that WM_PAINT is not send, but why? I thought after WM_SIZE (which is received) WM_PAINT is send automatically. I even tried to force the repainting in WM_SIZE but that doesnt work either (or maybe i forced it the wrong way...). Please help
here's some code:
Creating the Window:
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = ::GetModuleHandle(NULL);
wc.hIcon = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE (ID_ICON_SLICE_32));
wc.hIconSm = (HICON)LoadImage (GetModuleHandle(NULL), MAKEINTRESOURCE(ID_ICON_SLICE_16), IMAGE_ICON, 16, 16, 0);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
g_hWnd = CreateWindowEx(
0,
g_szClassName,
"SliceEdit v0.1",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, g_Width, g_Height,
NULL, NULL, GetModuleHandle(NULL), NULL);
// in winproc DefWindowProc deals with WM_SIZE
...
case WM_PAINT:
PAINTSTRUCT PS;
HDC hDc = BeginPaint(m_hWnd,&PS);
SetDIBitsToDevice (hDc, 0, 0, w, h, 0, 0, 0, h, m_pBits, &m_BMI, DIB_RGB_COLORS);
EndPaint(m_hWnd,&PS);
-- modified at 15:39 Saturday 8th April, 2006
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thanks, but didn't work 
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did u see ur bitmap at least for once?
if yes, is the line correct:
wc.hInstance = ::GetModuleHandle(NULL);
?
why do not use
wc.hInstance = hInstance;//which is one of params of proc
?
A special image tool for C++ programmers, don't miss it!
The world unique Software Label Maker is here for you and me ...
A nice hyper tool for optimizing your MS html-help contents.
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hi again
yes, the bitmap is drawn. the prob is, when i first minimize the window and then bring it back to the screen (via clicking on it in the taskbar) the client area (the bitmap) is not redrawn, the area is white. Its only drawn again when i move the mouse over the window or when I move another window in front of it (so i guess when WM_PAINT is called).
I used GetModuleHandle(NULL) because actually the window creation is in another method (which is called from winmain). But still, I tried your suggestion and it doesnt solve my problem. Any other tips? Thanks a lot
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last tip, I have no more.
if it is called from WinMain(), why do not pass hInstance from WinMain() to the function which contains ur code above?
such as:
MyCreateFunction(HINSTANCE hInstance);
A special image tool for C++ programmers, don't miss it!
The world unique Software Label Maker is here for you and me ...
A nice hyper tool for optimizing your MS html-help contents.
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yes thanks, i did that but it doesnt solve the problem
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Hi naal11,
Whats m_pBits, &m_BMI? Can you be more specific
But if you use WM_PAINT for show bitmap I think It's not problem
I run and then Min and Max window but bitmap is fix.of course I use
BitBlt.
-----------------------------------------
please try
InvalidateRect(hWnd,&rect,1);
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m_pBits it a pointer to the pixeldata. m_BMI is the BITMAPINFO -struct. But these things shouldnt be the prob since drawing the bitmap works. I tried InvalidateRect(hWnd,NULL,1) but its still not working. I even tried painting into the device context (SetDIBitsToDevice...) inside the WM_SIZE case but no effect. thanks for your help
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naal11
please try
RECT rect;
GetWindowRect(hWnd,&rect);
InvalidateRect(hWnd,&rect,1);
InvalidateRect(hWnd,NULL,1)
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msdn docs say that by passing NULL the entire client area is invalidated. but i tried it your way and it doesnt work
thanks anyway
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