C / C++ / MFC

21-Aug-05 11:51

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 Smile | :)

Trollslayer21-Aug-05 12:50

Trollslayer

21-Aug-05 12:50

Sample code please Smile | :)

Here is a piece of my code :

<br />
CEdit searchedit;<br />
CString srchstrl;<br />
searchedit.GetWindowText(srchstrl);	// The string to search for<br />

Remember the text is not returned, it is placed in the CString refrence.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Gurra_Koo21-Aug-05 12:50

Gurra_Koo

21-Aug-05 12:50

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"

Jose Lamas Rios21-Aug-05 15:38

21-Aug-05 15:38

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/[^]

Tim Zorn21-Aug-05 14:09

21-Aug-05 14:09

no. ive only tried WM_GETTEXT. ill go see if it works.
thanks for the help

Tim Zorn22-Aug-05 5:37

22-Aug-05 5:37

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

Tim Zorn21-Aug-05 14:23

21-Aug-05 14:23

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 />

Jose Lamas Rios22-Aug-05 5:50

22-Aug-05 5:50

Using GetWindowText may not work for windows created in another process, but sending WM_GETTEXT directly should work anyway.

--
jlr
http://jlamas.blogspot.com/[^]

Jose Lamas Rios21-Aug-05 16:40

21-Aug-05 16:40

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; // or whatever size you want
   TCHAR buffer[nBufLen];
   SendMessage(0, WM_GETTEXT, nBufLen, (LPARAM) buffer);
   // Text should be in buffer now

--
jlr
http://jlamas.blogspot.com/[^]

Tim Zorn22-Aug-05 5:34

22-Aug-05 5:34

no, i already tried that.
the classes of the edit controls im trying to read are UsTextEditPane and Ate32Class
if that helps at all

Jose Lamas Rios22-Aug-05 5:47

how to get binary RGB data from webcam?

22-Aug-05 5:47

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/[^]

MDI problem

Ali Tavakol21-Aug-05 9:45

Ali Tavakol

21-Aug-05 9:45

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.

Re: MDI problem

Gurra_Koo21-Aug-05 12:54

Gurra_Koo

21-Aug-05 12:54

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"

Re: MDI problem

Ali Tavakol21-Aug-05 20:04

Ali Tavakol

21-Aug-05 20:04

No.
it is a message that sholud be trapped after WM_COMMAND message.

ThinkingPrometheus21-Aug-05 9:14

ThinkingPrometheus

21-Aug-05 9:14

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

Re: how to get binary RGB data from webcam?

Andrew Walker21-Aug-05 16:32

Andrew Walker

21-Aug-05 16:32

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.

Re: how to get binary RGB data from webcam?

ThinkingPrometheus23-Aug-05 12:11

ThinkingPrometheus

23-Aug-05 12:11

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

Printing multiple Views in MFC

suzie10021-Aug-05 8:40

suzie100

21-Aug-05 8:40

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.

Re: Printing multiple Views in MFC

Jano Petras21-Aug-05 14:46

Jano Petras

21-Aug-05 14:46

Certainly you could pass a message with CDC as parameter - or create custom class to do printing and from the OnPrint method in one of the views create an array of pointers to all other views and pass this as a parameter to your print method that would then print all of them.

As per printing accross pages - done it few times and always a headache. One of the better techniques I used was clipping rectangles (per page) and moving CDC drawing origin according to the page being printed. I think this worked the best for me.

Good luck Smile | :)

Regards
JP

getting text of selected item in listview

/*Trucker*\21-Aug-05 8:04

/*Trucker*\

21-Aug-05 8:04

Hi All,

I have been trying to do this simple task for half a night and as simple as it sounds, I can't get it to work. Mad | :mad:

I have a listview and I am trying to get the text of the selected item when user selects one (this is a single select listview). I've tried the following but none work:

System::Void Form1::lv_files_SelectedIndexChanged(System::Object *  sender, System::EventArgs *  e){

	// Intellisense tells me that there is no '->Text'
	// after Item(0) even though when reading through
	// the .NET Framework, this sounded logical
	String* sss = lv_files->SelectedItems->Item(0)->Text;

	//Intellisense tells me this does not work either
	ListViewItem* selectedFile = dynamic_cast<ListViewItem*>(e);
	String* sss = selectedFile->Text;

	//...and many other unsuccessful ways which I already forgot
}

So how do I actually get the text of the selected item? Im tired, and passed the pissed off point so any help would be appreciated immensly WTF | :WTF:

TraileR ParK LifE 4Ever >:{

Jose Lamas Rios21-Aug-05 11:08

21-Aug-05 11:08

Try lv_files->SelectedItems[0]->Text

--
jlr
http://jlamas.blogspot.com/[^]

/*Trucker*\21-Aug-05 11:16

/*Trucker*\

21-Aug-05 11:16

It worked! Thanks a lot!
...And I've been trying all those complicated ways when this short line does it! OMG | :OMG:

Thanks again Smile | :)

TraileR ParK LifE 4Ever >:{

Jose Lamas Rios21-Aug-05 17:35

21-Aug-05 17:35

gr8coaster329 wrote:
...And I've been trying all those complicated ways when this short line does it!

Exactly my feelings whenever I see James Bond seducing yet another Bond girl. Wink | ;)

gr8coaster329 wrote:
Thanks again

No problem. Glad to be of help Smile | :)

--
"the name's Lamas, Jose Lamas" jlr
http://jlamas.blogspot.com/[^]