Re: web cam - C / C++ / MFC Discussion Boards

Re: How can I clear drop list combo box?

wb27-Jul-03 22:42

27-Jul-03 22:42

m_comboBox.SetCurSel(-1)

web cam

Anonymous27-Jul-03 18:07

Anonymous

27-Jul-03 18:07

is there a way I can control the working of a webcam using a windows application . if yes what are the API's I need to look at ?

Re: web cam

Beer2627-Jul-03 18:28

Beer26

27-Jul-03 18:28

http://msdn.microsoft.com/library/default.asp?url=/library/EN-US/netmeet/nmstartpage_3bov.asp[^]

you can get the platform sdk here

http://www.microsoft.com/msdownload/platformsdk/sdkupdate/ [^]

These links will get you started with the netmeeting sdk, which is the easy way out of writing networking cam software. If you want to really write your own software from scratch, I'm sure somebody else will post some information for you as well for that. Or maybe not.

Re: web cam

csc27-Jul-03 21:09

csc

27-Jul-03 21:09

you may try this link :

http://www.naughter.com/vfwgrab.htm

The app was made for posting images into web, but you may use the code (or some snippets) for your own ideas.

Smile | :)

Re: web cam

Anonymous28-Jul-03 5:18

Anonymous

28-Jul-03 5:18

Thank you for the help but I am unable to locate
<gdiplus.h>

included in stdafx.h

Re: web cam

Anonymous28-Jul-03 5:19

Anonymous

28-Jul-03 5:19

i meant gdiplus.h

Re: web cam

csc28-Jul-03 19:41

csc

28-Jul-03 19:41

ok, got the problem .... i've downloaded that source and the needed gdiplus files are not included.

So try this ... there is an other article named hints get GDI+ running
here at codeproject :

http://www.codeproject.com/useritems/codemaze.asp

http://www.codeproject.com/useritems/CodeMaze/GDI+Files.zip

The download file is about 1 MB big, but includes a complete gdi+ version (gdiplus*.* => dll, lib, headers). I have not tried to merge both projects and re-compile the exe, but if there are problems you may ask PJ Naughter directly for a hint.

Re: web cam

Andrew Walker28-Jul-03 1:03

Andrew Walker

28-Jul-03 1:03

If you want to control the properties of the camera try DirectShow, specifically:

the IAMCameraControl Interface
the IAMVideoProcAmp Interface

IAMCameraControl gives you access to

typedef enum {<br />
    CameraControl_Pan = 1,<br />
    CameraControl_Tilt,<br />
    CameraControl_Roll,<br />
    CameraControl_Zoom,<br />
    CameraControl_Exposure,<br />
    CameraControl_Iris,<br />
    CameraControl_Focus<br />
} CameraControlProperty;

IAMVideoProcAmp gives you access to

typedef enum tagVideoProcAmpProperty<br />
{<br />
    VideoProcAmp_Brightness,<br />
    VideoProcAmp_Contrast,<br />
    VideoProcAmp_Hue,<br />
    VideoProcAmp_Saturation,<br />
    VideoProcAmp_Sharpness,<br />
    VideoProcAmp_Gamma,<br />
    VideoProcAmp_ColorEnable,<br />
    VideoProcAmp_WhiteBalance,<br />
    VideoProcAmp_BacklightCompensation,<br />
    VideoProcAmp_Gain<br />
} VideoProcAmpProperty;

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

help with "job object"

bigeyedfish8127-Jul-03 17:58

bigeyedfish81

27-Jul-03 17:58

I am writing a COM dll that uses job objects to control certain procsses. I am having trouble with getting my job object to behave in the way I want, and there is a profound lack of documentation on this subject so I am reaching out to the outer world for help. I am new to this forum, but I was immediately impressed by the knowledge that I have found here at CP. If any of you saving developers have worked with job objects or are familier with the querky inner workings of them, I would be grateful for your response.

The main problem that I am having is getting my job object to terminate at the right point, and not to terminate when I don't want it to. If any of you savvy developers have worked with job objects or are familier with the querky inner workings of them, I would be grateful for your response. Please post or email me if you are interested and I can explain in greater detail and give source code to go along with it. TIA

If at first you don't succeed, Post....

Re: help with "job object"

Mike Dimmick28-Jul-03 2:11

Mike Dimmick

28-Jul-03 2:11

Haven't used it, but Jeff Richter covers it in Programming Applications for Microsoft Windows[^].

Previous editions of this book were called Advanced Windows, but the chapter on jobs is new to the fourth edition (being new to Windows 2000).

Re: help with "job object"

bigeyedfish8128-Jul-03 4:30

bigeyedfish81

28-Jul-03 4:30

Thanks mike...Ill check it out...If anyone else knows where I can find any other documentation on this subject let me know....

2 dimension array in COM

novachen27-Jul-03 17:08

novachen

27-Jul-03 17:08

I am writing a COM dll in ATL.
But if i write "double bound[2][2]" in IDL, in c#, the parameter is "double[] bound". Maybe user will be puzzled by refer to 1 dimension array.
How can i express the function interface as strict as possible?
Thanks!!

Custom Buttons

Dov Sherman27-Jul-03 16:13

Dov Sherman

27-Jul-03 16:13

I'm using some custom buttons which use bitmaps for their appearance. These buttons are all stored as MFC Bitmap project resources in the default 16 colors. They are placed in the program using CBitmapButton::LoadBitmaps and CMenu::SetMenuItemBitmaps (for different purposes).

They seem to work just fine but, if the user is using desktop settings which select a different color for "3D Objects" so that windows appear in a color other than the default grey, the custom buttons still have a gray background although my custom toolbars change to match the user color.

How can I get my custom bitmaps to adapt to the user's desktop colors?

Re: Custom Buttons

Ryan Binns27-Jul-03 17:58

Ryan Binns

27-Jul-03 17:58

Instead of CBitmap::LoadBitmap(), use LoadImage() with the LR_LOADTRANSPARENT and LR_LOADMAP3DCOLORS flags.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Custom Buttons

Dov Sherman28-Jul-03 7:20

Dov Sherman

28-Jul-03 7:20

Do you mean CBitmap::LoadMappedBitmap()? That code seem to work. Thank you!

But what can I use for CBitmapButton::LoadBitmaps() to achieve the same effect? It doesn't seem to have an equivalent parallel.

How to define a CALLBACK function

FlyingDancer27-Jul-03 15:53

FlyingDancer

27-Jul-03 15:53

I don't still master CALLBACK function,
such as its working theory and coding rule and so on
Can somebody tell me?
Thank you in advance!

Re: How to define a CALLBACK function

parths27-Jul-03 16:50

parths

27-Jul-03 16:50

As far as I know there's nothing much different in syntax.
just use the CALLBACK specifier.

The difference come in the code that's inside the function.
A callback is called from some outside source (usually windows itself) on the occurence of some event. Callback functions are 're-entrant'. So if that event occurs twice while your function is still processing windows will still call the function for execution (instead of waiting the first call to finish it's job).
This means that you have to make sure that your callback routine can handle such a situation.
Setting / resetting values of variables can cause a lot of confusion here.

"It was when I found out I could make mistakes that I knew I was on to something."
-Ornette Coleman

Re: How to define a CALLBACK function

FlyingDancer27-Jul-03 17:15

FlyingDancer

27-Jul-03 17:15

Thank you again
It will cost much time to solve this problem if one error happens here.

Re: How to define a CALLBACK function

parths27-Jul-03 17:40

parths

27-Jul-03 17:40

Actually I've never read any formal documentation on CALLBACK function, don't even know if there's anything good around.
I just tried using the different callbacks with the WINAPI enum functions... and making mistakes!

"It was when I found out I could make mistakes that I knew I was on to something."
-Ornette Coleman

Re: How to define a CALLBACK function

geo_m28-Jul-03 20:02

geo_m

28-Jul-03 20:02

You may consider to look here: The site dedicated to C and C++ Function Pointers[^]

Re: How to define a CALLBACK function

FlyingDancer28-Jul-03 20:26

FlyingDancer

28-Jul-03 20:26

Thank you very much!
Rose | [Rose]

Multiple Document Support Opening Problem

bneacetp27-Jul-03 15:26

bneacetp

27-Jul-03 15:26

I trying to create an MFC app which is capable of opening and creating multiple types of documents. I have two document templates created in the main app class using the CMultiDocTemplate class. Everything appears to work, except when I try to open a document (Rich Text in this case) that was saved (which is supported by the app) the document appears to be empty. Any ideas as to what might need to be done to make this work? Confused | :confused:

Thanks.

neacetp

Sending non-keyboard chars

phlipping27-Jul-03 13:56

phlipping

27-Jul-03 13:56

Come ON, someone out there must know this...

How can you send a char that's not on the keyboard using SendInput?

To type '¯', for example, you hold alt and type 0175 on the num pad.
So I guessed this, but it doesn't work Frown | :(

int i;
INPUT input[10];
ZeroMemory(input, sizeof(input));
for (i = 0; i < 10; i++)
  input[i].type = INPUT_KEYBOARD;
input[0].ki.wVk = 18; //there doesn't seem to be a VK_ALT
input[1].ki.wVk = input[2].ki.wVk = 0x60; //num0
input[3].ki.wVk = input[4].ki.wVk = 0x61; //num1
input[5].ki.wVk = input[6].ki.wVk = 0x67; //num7
input[7].ki.wVk = input[8].ki.wVk = 0x65; //num5
input[9].ki.wVk = 18;
input[2].ki.dwFlags = input[4].ki.dwFlags = input[6].ki.dwFlags =
  input[8].ki.dwFlags = input[9].ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(10, input, sizeof(INPUT));

using a keyboard logger, i can see that it does exactly what I want, ie press alt, type 0175, release alt, but it doesn't send '¯' to the active app
Confused | :confused:

Any ideas?

Any method to simulate the typing of ¯ to the active app will be fine - not necessarily SendInput(), that's just what i have used do far.

thanks in advance

=====
Phlip

Always proofread carefully to see if you any words out

Re: Sending non-keyboard chars

Michael Dunn27-Jul-03 14:37

Michael Dunn

27-Jul-03 14:37

Friendly advice: Yelling at the board will not increase the chances of getting a response.

Partial response: Use VK_MENU for the Alt key.

--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
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Re: Sending non-keyboard chars

phlipping27-Jul-03 14:44

phlipping

27-Jul-03 14:44

Michael Dunn wrote:
Friendly advice: Yelling at the board will not increase the chances of getting a response.

but it will increase it's chance of getting seen - this forum's so popular that in 1 day a post drifts back to the third page - it's quite likely that a lot of regulars who might know the answer to my problem never saw the post because it had disappeared before they got here.

=====
Phlip

Always proofread carefully to see if you any words out

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.