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The program is layed out as follows:
(Program 1 :: EXE) -- This I cannot modify
+Contains a form which creates child windows
+Sends HWNDs of child windows to DLL to attach to.
(Program 2 :: DLL) -- This I am writing
Main Thread:
+Starts Graphics Thread, waits for return
+ Posts Message to Graphics Thread to create it's windows
+ Posts Message to Graphics Thread to subclass it's windows
Graphics Thread:
+ Creates instances of each window (each are OpenGL classes wrapped in a CWnd)
for(unsigned short i = 0; i < NUMWIN; i++)
{
pGraphicsWin[i] = new COpenGLWin ( i );
}
+ Subclass Window to the received HWND.
BOOL worked = pGraphicsWin[i]->SubclassWindow( hwnd );
+Do appropriate other stuff
Ok, my problem is as follows:
While the subclass window appears to work correctly (though I doubt it really is), when I try to access the device context ( i.e. this.GetDC() ) of one of the graphics windows, it fails.
I believe this is due to the fact that subclassing is process specific, and therefore you cannot subclass a window which is not running in the same process as your application.
Therefore, I have read up on CBT hooks, however, I can't seem to figure out where to set the hook. Also, I read that only one hook is necessary per thread, not per window, but I am confused as to how that would work!
Appreciate your help, I'm stumped! 
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hello
i work in network when we use the X25 protocole to comunicate and i want to make an application to download files from others PCs of the network,and i have no idea how to do that,are there someone who can help me ?
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Surely you must have some kind of API to work with, and which comes with a manual. If you can, you can always use the connection oriented part of X.25, and then it's not much different from TCP/IP. I think.  It's been a while since I did X.25. I read about it in the datacom courses at the university, and I briefly came in touch with it for a telecom application I wrote 6, almost 7 years ago.
Good music: In my rosary[^]
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how do u create a dc over ur whole dialog window and allow a user to draw lines on it?
help would be appreciated
thx
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Override the CDialog::OnPaint()
Unless you really mean the WHOLE window in which case use GetWindowDC()
It's frustrating being a genius and living the life of a moron!!!
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ok, thx. now how do u allow the user to draw on it?
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You could create a custom control that handled the drawing and then insert the control in the dialog.
To enable drawing you need to handle mouse messages (button down, mouse move, button up, etc.) and draw in the window accordingly.
You can look at Microsoft's scribble sample program to get ideas on how to do it. There are Win32 and .NET versions for this sample, and although they are intended as MFC tutorials, you can still use it to extract useful ideas.
--
jlr
http://jlamas.blogspot.com/[^]
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i dont understand why i cant get the text from an editbox of a window
its a window that was created durring runtime
i tryed GetWindowText on a handle to the edit box but it outputs a bank char array
is it somehow different for getting text from editboxes that are created during runtime?
im pretty sure that the dialog window is created during runtime but i may be mistaken because its not my program that creates it
help would be very appreciated
thx
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Sample code please
Here is a piece of my code :
<br />
CEdit searchedit;<br />
CString srchstrl;<br />
searchedit.GetWindowText(srchstrl);
Remember the text is not returned, it is placed in the CString refrence.
Elaine ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
The tigress is here 
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Have you tried sending the control an EM_GETTEXTEX message?
Here's the link to the the msdn library entry on EM_GETTEXTEX[^]
"There is an empty room full of people who think you are creative"
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GetWindowText should work. Post some code to see how you are doing it, and someone may be able to spot the problem.
--
jlr
http://jlamas.blogspot.com/[^]
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no. ive only tried WM_GETTEXT. ill go see if it works.
thanks for the help
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i know im doing it right because it works for titlebars and stuff
read the post i made about the classes they are and maybe that will help u help me
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can u fix this code for me? i dont understand how to use GETTEXTEX
<br />
GETTEXTEX gte;<br />
ZeroMemory(>e,sizeof(gte));<br />
gte.cb = 512;<br />
gte.codepage = CP_ACP;<br />
<br />
SendMessage(hwnd,EM_GETTEXTEX,(WPARAM)>e,(LPARAM)temp);<br />
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Using GetWindowText may not work for windows created in another process, but sending WM_GETTEXT directly should work anyway.
--
jlr
http://jlamas.blogspot.com/[^]
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From MSDN's documentation for the GETTEXTEX Structure[^]:
"The GETTEXTEX structure contains information about an operation to get text from a rich edit control"
Are you trying this with a rich edit control? Otherwise, I don't think it will work.
Try this instead:
const int nBufLen = 512;
TCHAR buffer[nBufLen];
SendMessage(0, WM_GETTEXT, nBufLen, (LPARAM) buffer);
--
jlr
http://jlamas.blogspot.com/[^]
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no, i already tried that.
the classes of the edit controls im trying to read are UsTextEditPane and Ate32Class
if that helps at all
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Tim Zorn wrote:
no, i already tried that.
And...? What was the result? Post some code to see how you are doing it and what specific error you get.
--
jlr
http://jlamas.blogspot.com/[^]
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when we open a child window in a MDI application, and maximize it, its caption-bar diappears and its close, maximize and minimize buttons appears in the menu-bar.
when user maximizes an MDI child window and then clicks its close button, what message is sent to my program? i can't trap it.
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I'm not shure, but isn't it a WM_PARENTNOTIFY message?
"There is an empty room full of people who think you are creative"
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No.
it is a message that sholud be trapped after WM_COMMAND message.
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hiho@ll
i had a look at this tutorial
to capture video from a webcam
now i need just the RGB data from the webcam!
i don't want the webcam data to be displayed on the screen (well i want it too) but i need the binary data!
anybody knows a filter which i can use to grab the data
cause i'm a noob at this topic, a tutorial or a sample code would be great
hmm
btw maybe i'm wrong, but it seems that there is no tutorial about direct show programming! or not?
i search for some, but i only get some doc about some functions
but what if i want to prog my own filter, how do pins work and what are they exactly?
it's not easy to find a good basic tutorial about directshow programming!
anybody knows a good resource?
thx@ll
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To prevent rendering you'll need a null renderer
To capture images from the graph you'll need ISampleGrabber (or a variant)
Source Filter -> ISample Grabber -> Null Renderer
If you're looking for a simple way to do this, have a look at OpenCV (Intel's Open Computer Vision Library) hosted on sourceforge - you should be able to borrow or modify enough of their code to get started.
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hiho
thx for your help!!
this library (OpenCV/cvcam) is damn cool!
it's exactly what i need and i just got it run
but i have a little problem, maybe you can help if you already worked with the library
i have a IplImage pointer to the image from which i want to read the image's RGB values
my problem is the access to the rawdata array!
the pointer points to a image structure with a value
imageData = the raw data
imageSize = the byte size (i think)
in an example i saw this code
memset(img->imageData, 0, img->imageSize/2);
which simply set's the first half of the image to black
this code crashes my prog!
the same happens if i use a loop to read every pixel values
i just can read the first 146047 bytes of the buffer
then it crashes
i'm sure it's because it's a segmentation fault
so my question
if i use image->imageSize as a byte limit for the image raw data buffer
and this is wrong
how do i know the exact size of the raw data buffer? because imageSize doesn't seem to be correct
thx
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Hi,
I am a newbiew to .NET, MFC and Visual C++.
I have multiple Views (Say View A, B and C), and a Document in my Design. On the Print and Print Preview I need to print information from all the views. Currently I have overloaded the OnPrint() function in View A.
After View A 's print is done, how do I get it to Print View B and View C's Data. Should I post a Message to View B and C passing the CDC object, and each of the View (B &C) use the CDC object and continue the printing.
Please let me know if thats the right way to do or if there is a better way. Also how do I print across pages.
Thanks for your help.
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