C / C++ / MFC

VfW Saving Compression Options

16-Feb-20 23:02

There's no need, actually.

Member 1305023114-Feb-20 5:35

14-Feb-20 5:35

hi!
i wrote a very simple app to capture videos with VfW.

HWND hwnd = capCreateCaptureWindow ("MyWindow", WS_CHILD | WS_VISIBLE , 0, 0, 160, 120, hwndParent, nID);
capDriverConnect (hWndC, 0);
capDlgVideoCompression(hwnd); // this displays the compression settings dialog
capCaptureSequence (hwnd);

does anyone know how to store the compression settings to reuse them?
is there any possibility to access the internal data of the capture window?
thanks in advance
-arni

Richard MacCutchan14-Feb-20 6:01

14-Feb-20 6:01

Yes, but it depends how the information is stored by the library functions. The documentation should help.

Member 1305023114-Feb-20 11:58

14-Feb-20 11:58

Thanks for the reply...you are right - that's the question! the documentation doesn't say anything about that.

Richard MacCutchan14-Feb-20 22:28

14-Feb-20 22:28

How are these values set in the first place? And, surely if you can display them then you can save the results somewhere.

Member 1305023114-Feb-20 23:36

14-Feb-20 23:36

the call to:

capDlgVideoCompression(hwnd);

displays a dialog to choose compression an parameters, and after "OK" they are stored somewhere (in the hwnd?) this process does work for the current session, but when i restart my app everything is gone. none of the structures (CAPDRIVERCAPS,CAPINFOCHUNK,CAPSTATUS,CAPTUREPARMS,etc.) gives me valid information about the chosen compression. what i need is the COMPVARS or AVICOMPRESSIONOPTIONS structure, but to access these seems to be a completely different approach.
tia.
-arno

Richard MacCutchan14-Feb-20 23:53

14-Feb-20 23:53

The HWND object only exists for the life of the application, so any values stored inside it will be lost when the application terminates. You will need to save all the values yourself in some permanent storage area. See Where should I store my data?[^]; it's written for .NET but can easily be adapted to a Win32 app.

Member 1305023116-Feb-20 1:39

16-Feb-20 1:39

ok, i know that my classes and variables won't survive - the question was not how to SAVE the data, it's how to ACCESS it!
thanks richard.
anyone else has any idea?

jeron117-Feb-20 4:00

jeron1

17-Feb-20 4:00

Quote:
the question was not how to SAVE the data,

from the OP

Title:
VfW Saving Compression Options

Quote:
does anyone know how to store the compression settings to reuse them?

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Member 1305023117-Feb-20 6:35

Change Dir inside CFileDialog

17-Feb-20 6:35

plz read the whole thread! i want to store the settings, that i made in the dialog! i haven't found a way to ACCESS the data/settings programmatically - that was my question.
i know thousands of ways to store/serialize/dump the data.
thank you.

Member 40147611-Feb-20 3:53

11-Feb-20 3:53

Hi everyone, I have a problem in vc6.
In a CFileDialog with 2 configured extensions (eg .Txt and .doc) I want
automatically change directory in my CFileDialog when the extension changes:
when I select the .txt extension I want the CFileDialog in the 'C:\FileTxt' directory,
when instead I select the extension .doc I want the CFileDialog in the directory 'C:\FileDoc'
with the corresponding files list ...
...Can someone help me with some example?
Thank you

I Try, but I'm not sure Smile | :)

)

CPallini11-Feb-20 4:56

11-Feb-20 4:56

I don't get you. I mean, the user once the file dialog is open, chooses both the folder and the file extension (by choosing an allowed file). What do you want to do, instead?

Member 40147611-Feb-20 5:07

11-Feb-20 5:07

I want that automatically when I change the extension of the files I want to see, the dialog automatically also change the folder of the list of files. The '.txt' files are in one folder, the '.doc' files in another ...

I Try, but I'm not sure Smile | :)

)

CPallini11-Feb-20 5:14

11-Feb-20 5:14

Ok but... How do you change the extension of the files you wanto to see?

Member 40147611-Feb-20 5:20

11-Feb-20 5:20

in the Combo box that appared in CFileDialog when I configure more extension, I intercept the OnTypeChange() and in this routine I want change the dir...

I Try, but I'm not sure Smile | :)

)

CPallini11-Feb-20 10:38

11-Feb-20 10:38

You are right, in time I forgot the behavior of such a dialog. Here you may find an hint: https://www.experts-exchange.com/questions/20090938/Changing-location-in-Open-Save-dialog.html[^].

Member 40147611-Feb-20 23:30

11-Feb-20 23:30

sorry... in expert-exchange :
"You can use the DlgDirList() function (of CWnd class). It fills a list box with a file or directory listing. Only thing you should know is the ID of the list control."

and I haven't the ID of the list control Frown | :(

I Try, but I'm not sure Smile | :)

)

CPallini12-Feb-20 2:07

12-Feb-20 2:07

I think the more promising approach shown in the linked page is writing the address of folder in the edit box and then (programmatically) clicking the OK button (check out the final comments).

Richard MacCutchan11-Feb-20 5:18

CFileDialog Class - ontypechange[^]

11-Feb-20 5:18

Member 40147611-Feb-20 5:32

11-Feb-20 5:32

Thank's Richard, I have see the class...
I have that routine and in that routine I want change the dir.
Different dir for different extension.

I Try, but I'm not sure Smile | :)

)

Richard MacCutchan11-Feb-20 5:53

11-Feb-20 5:53

Then you need to handle the notification message, as documented in that link.

Member 40147611-Feb-20 6:02

11-Feb-20 6:02

Thank's Richard,
I'm using VC6++ and I need a simple example to understand..

my OnTypeChange()
{
if(m_ofn.nFilterIndex==1)
m_ofn.lpstrDefExt=".txt";
if(m_ofn.nFilterIndex==2)
m_ofn.lpstrDefExt=".doc";

if(m_ofn.nFilterIndex==1)
...code for change dir1
if(m_ofn.nFilterIndex==2)
...code for change dir2

}

I Try, but I'm not sure Smile | :)

)

Richard MacCutchan11-Feb-20 8:20

11-Feb-20 8:20

You need to check which property or method controls the current directory, and add code to manage it. Again the documentation will give you the information.