Re: Catch data stream going to graphics card - C / C++ / MFC Discussion Boards

Bartosz Bien26-Aug-03 10:50

26-Aug-03 10:50

I have the following code concerning loading GDI+ Bitmap (PNG actually) of length len from buffer buf:

HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, len);<br />
void *buf = hGlobal ? GlobalLock(hGlobal) : NULL;<br />
if(buf) CopyMemory(buf, CBaseItem::BFFile->Buf, len);<br />
else if(hGlobal) GlobalFree(hGlobal);<br />
<br />
IStream* stream = NULL;<br />
if(buf && CreateStreamOnHGlobal(buf, TRUE, &stream) == S_OK)<br />
{<br />
    image = Bitmap::FromStream(stream);<br />
    stream->Release();<br />
}

It works perfectly on XP, but it fails under Windows Millenium: image->LastResult == InvalidParameter. The data in a buffer seems the same in both cases.

Why is it so? Confused | :confused:

Regards,
BB

extract image from wmv file

Emiliano26-Aug-03 10:38

Emiliano

26-Aug-03 10:38

How do you extract an image from a wmv file? Any samples or possible ideas, i have looked at the windows media format sdk, but its not too easy to understand

Any help would be a real life saver!

Re: extract image from wmv file

KaЯl26-Aug-03 22:17

KaЯl

26-Aug-03 22:17

the function OleLoadPicture could do what you're searching for, coupled with a IPicture interface. Have a look to the sample 218972[^] from MSDN.

HTH,

K.

I have always observed that to succeed in the world one should appear like a fool but be wise - Montesquieu

Blog: Life, Death and other things

Create/Remove Users on Win2000 Server

netx200326-Aug-03 8:53

netx2003

26-Aug-03 8:53

Is there any way that I using code can add and remove users on Windows 2000 Server.

Re: Create/Remove Users on Win2000 Server

Brad Sokol26-Aug-03 9:13

Brad Sokol

26-Aug-03 9:13

Have a look at the Active Directory doc on MSDN, specifically the samples for creating a user [^].

Brad

Re: Create/Remove Users on Win2000 Server

parths26-Aug-03 15:22

parths

26-Aug-03 15:22

NetUserAdd worked for me.

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

Catch data stream going to graphics card

Shane.B26-Aug-03 7:29

Shane.B

26-Aug-03 7:29

Hi, need help!!

Does anybody know how to grab the data stream that goes to
the graphics card from windows and then on to a projector for example, or even how this works????
I presume that the data stream is going to come from the
windows desktop through win32.

Any ideas or links greatly appreciated!!

Cheers,
/Shane.

Re: Catch data stream going to graphics card

John M. Drescher26-Aug-03 7:39

John M. Drescher

26-Aug-03 7:39

This can not be done easily. Use a projector that has a vga input. If you are using a laptop it should have a vga connector and you should be able to use both on, or either on. Their should be a keyboard command for that.

John

float to hex

Jay Hova26-Aug-03 7:12

Jay Hova

26-Aug-03 7:12

Hi,

Is there a method that will convert an float to a hex number?

Thanks.

Re: float to hex

David Crow26-Aug-03 7:29

David Crow

26-Aug-03 7:29

A "hex" number is how it is represented, not how it is stored (i.e., its type). All numbers have a base-16 representation, be they floating-point or integer. For example, if I had a number (12345) and I wanted to see its base-16 representation, I'd use:

int num = 12345;
char szNum[16];
sprintf(szNum, "%#x", num);

szNum now contains "0x3039." No conversion was done, it's just shown in a different base.

See if these two MSDN articles help you along any:

Q42980
Q125056

Re: float to hex

Jay Hova26-Aug-03 7:49

Jay Hova

26-Aug-03 7:49

Thanks for the help.

Where can I find those articles, on the msdn.microsoft site?

Just to clarify: I am sending information from my program to someone else via the internet. I was told that the information has to be sent in hex format. So are you saying i can just send a float number?

Thanks for all your help

Re: float to hex

David Crow26-Aug-03 8:02

David Crow

26-Aug-03 8:02

Jay Hova wrote:
Where can I find those articles, on the msdn.microsoft site?

Yes.

Jay Hova wrote:
Just to clarify: I am sending information from my program to someone else via the internet. I was told that the information has to be sent in hex format. So are you saying i can just send a float number?

See this thread.

Re: float to hex

Roger Wright26-Aug-03 8:09

Roger Wright

26-Aug-03 8:09

Great... While I'm off, straining my tiny brain to come up with something that might just pass for helpful, you pop in with an easy solution. Sheesh! Laugh | :laugh:

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Drive Nice - We're Armed..."
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Re: float to hex

David Crow26-Aug-03 8:21

David Crow

26-Aug-03 8:21

I know the feeling.

http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=592740#xx592740xx

Re: float to hex

Roger Wright26-Aug-03 8:07

Roger Wright

26-Aug-03 8:07

I'm not sure what they're trying to say - "Hex format"? It could many several things.

The IEEE format for representing a floating point number is

S EEEEEEEE FFFFFFFFFFFFFFFFFFFFFFF
0 1 8 9 31

where S = the sign bit, EEEEEEEE = the exponent, and FFF...F = the fractional mantissa. In this format each bit has meaning, and on the receiving end the consumer has to expect and recognize this format. When you send it in hex, you're just sending bits in groups of 4, or

SEEE EEEE EFFF FFFF FFFF FFFF FFFF FFFF
Hex0 Hex1 Hex2 Hex3 Hex4 Hex5 Hex6 Hex7

It's up to the receiver to combine the 8 hex characters' bit pattern into a single 32-bit value and correctly interpret it as a floating point value.

On the other hand, if your application requires you to send text data only, using the ascii characters that represent the hex characters that are equivalent to your floating point value, you have a real challenge. First you'll have to convert the float into a collection of 4-bit chunks, then determine the hex character for each chunk, then convert each hex character to text. I wouldn't know how to begin that, I'm afraid, though almost everyone here is smarter than I about such things and may be able to guide you.

Hopefully you're dealing with the first case...

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Drive Nice - We're Armed..."
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How to use the IP Control

S^nyp26-Aug-03 7:07

S^nyp

26-Aug-03 7:07

Anyone know how to use the ip control?? Maybe get the current machine's ip as an example... I would appreciate it. Confused | :confused:

<marquee>Universal Project

Re: How to use the IP Control

David Crow26-Aug-03 7:10

David Crow

26-Aug-03 7:10

Getting a machine's IP address and using the IP control are mutually exclusive things.

gethostname();<br />
gethostbyname();<br />
CIPAddressCtrl::SetAddress();

are what you need to look at.

Re: How to use the IP Control

S^nyp26-Aug-03 7:12

S^nyp

26-Aug-03 7:12

Let's pretend that you are talking to somebody that does not know anything about the IP Control. Examples are really nice things you know. Roll eyes | :rolleyes:

<marquee>Universal Project

Re: How to use the IP Control

David Crow26-Aug-03 7:32

David Crow

26-Aug-03 7:32

And they are plentiful!

http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=cipaddressctrl&btnG=Google+Search

Re: How to use the IP Control

Babayan Hovhannes27-Aug-03 0:21

Babayan Hovhannes

27-Aug-03 0:21

1) DWORD addr;
((CIPAddressCtrl*)GetDlgItem(IDC_IPIDDRESS1))->GetAddress(addr);

2) BYTE b1,b2,b3,b4;
((CIPAddressCtrl*)GetDlgItem(IDC_IPIDDRESS1))->GetAddress(b1,b2,b3,b4);

If address is 212.176.73.161, b1=212, b2=176, b3=73, b4=161.

yiy

Broadcast a msg in MFC

Todd Smith26-Aug-03 6:53

Todd Smith

26-Aug-03 6:53

I have a dialog application which hosts several sub dialogs. I need to send a message from one of the sub dialogs which can be received by all of the other sub dialogs. What's the best way to do this in MFC?

Todd Smith

Re: Broadcast a msg in MFC

David Crow26-Aug-03 7:05

David Crow

26-Aug-03 7:05

Are the dialogs modeless?

Re: Broadcast a msg in MFC

Todd Smith26-Aug-03 7:06

Todd Smith

26-Aug-03 7:06