C / C++ / MFC

24-Sep-13 23:29

in the function of undating,i need to obtain the version number which is getted from web server and set it to my software. could anyone show me how to set the version in code.
thanks!

Richard MacCutchan25-Sep-13 0:23

Richard MacCutchan

25-Sep-13 0:23

Is this a C++ question, and if so what version are you referring to?

Veni, vidi, abiit domum

koll Zhu25-Sep-13 0:46

25-Sep-13 0:46

thank u,my meaning is replacing the version of my .exe with the one from server.

koll Zhu25-Sep-13 0:51

25-Sep-13 0:51

i found how to complete it.thx all the same

Maximilien25-Sep-13 8:03

Maximilien

25-Sep-13 8:03

what was the solution ?

I'd rather be phishing!

koll Zhu25-Sep-13 16:06

does listivew_???? make handles leak...?

25-Sep-13 16:06

use method UpdateResource

JoneLe8624-Sep-13 19:10

JoneLe86

24-Sep-13 19:10

I am dealing with tons of functions, and i am using sendmessage and other macros as well, but somehow each time i use sendmessage the handles in taskmanger get increased, even using createfont as this

C++

Hfont = createfont(.....)
deleteobject(Hfont)

but as i know deleteobject will delete the Gdi object, but what abut its handle? I am not sure why this happens, even this

C++

listview_setitemcount(.....)

bty I am destroying my HWND object each time i use X button, so i make a new one (I have no problem with Gdi they all fine) except those handles? has anyone faced this?

Update; now 100% sure that using sendmessage(....) increasing my handles 1 time, but why?

modified 25-Sep-13 5:17am.

MFC PreTranslateMessage walks opposite the documentation.

Vaclav_24-Sep-13 9:04

Vaclav_

24-Sep-13 9:04

Just “discovered” that I can post a message into application main window from a secondary thread: AfxGetMainWnd()->PostMessage(WM_GRAPH, 0, 0);

No biggie, but I can also process the message using MFC PreTranslateMessage.
Still “so what?”

The catch is – the PreTranslateMessage “walker” starts in main app window and goes <b>DOWN the MFC </b>hierarchy and the message is eventually processed by correct object.

Just exactly the opposite what the doc say.

It does the work I need, but I wonder if my VC++ is broken again or is this normal?
Cheers Vaclav

Re: MFC PreTranslateMessage walks opposite the documentation.

Randor 24-Sep-13 11:03

Randor

24-Sep-13 11:03

Hi,

The documentation is correct. Note that 'PreTranslateMessage' is an MFC invention. Basically it boils down to this:

In Win32 each window has a default WindowProc callback function[^]. However the MFC does its own internal command routing. You should probably read some of the older MFC documentation from MSDN that explains it in detail.

Found one from Paul Dilascia (circa 1995):
http://www.microsoft.com/msj/0795/dilascia/dilascia.aspx[^]

Best Wishes,
-David Delaune

How to get Ip Address and Port No MFC Sockets

manoharbalu24-Sep-13 3:26

manoharbalu

24-Sep-13 3:26

I am using sockets derived from CSocket

I am getting details about the client IP address and Port after calling Accept(socket).

Eg:
void CListenSocket::OnAccept(int nErrorCode)
{
CSocket::OnAccept(nErrorCode);
m_pSocket->Accept(*pSocket);
}

Anyone Please let me know if it is possible to know the details about the client IP address and Port before calling Accept(socket).

Re: How to get Ip Address and Port No MFC Sockets

jeron124-Sep-13 3:40

jeron1

24-Sep-13 3:40

Perhaps this[^] link will help.

Check Driver

john563224-Sep-13 1:25

john5632

24-Sep-13 1:25

How to check outdated driver programmatically?

David Crow24-Sep-13 3:21

David Crow

24-Sep-13 3:21

Check it for what specifically? Confused | :confused:

A detail or three would be nice!

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

jeron124-Sep-13 3:29

jeron1

24-Sep-13 3:29

Maybe this[^] link will get you started in the right direction.

Erudite_Eric24-Sep-13 8:43

Erudite_Eric

24-Sep-13 8:43

You cant really since you have no idea just what it does at a functional level, however running it through Microsofts WHQL will tell you whether it is fit or not. You can also enable Verifier on it and select pretty much everything except Low Resource SImulationn.

If it fails these, junk it and tell who wrote it their product is garbage.

when its required explicit keyword in constructor

Gisle Vanem25-Sep-13 0:24

Gisle Vanem

25-Sep-13 0:24

You can use GetFileVersionInfoSize(), GetFileVersionInfo() and VerQueryValue on a driver-file just the same way as a DLL/EXE.

It is a bit complex, but see here for an example.

Gisle V.

# rm -vf /bin/laden /bin/rm: success

ranjithkumar8124-Sep-13 1:00

ranjithkumar81

24-Sep-13 1:00

Dear All,

when its required explicit keyword in constructor? and what is the purpose?

Regards,
Ranjith

Re: when its required explicit keyword in constructor

André Kraak24-Sep-13 2:16

André Kraak

24-Sep-13 2:16

It is used to prevent the constructor to be used for implicit conversion, see explicit (C++)[^] for an example.

0100000101101110011001000111001011101001

Convert raw image data to PNG

Don Guy23-Sep-13 12:39

Don Guy

23-Sep-13 12:39

Hey there,

I have the raw image data and now want to convert it to PNG image. How can i do that? The raw image data is stored in a unsigned char *.

I know how to convert it to Bitmap, but have no idea how to convert it to PNG.

Thanks in advance.

Garth J Lancaster23-Sep-13 13:03

Garth J Lancaster

23-Sep-13 13:03

that depends if you are adverse to using open source libraries or you wish to write the code yourself

have you looked at libpng ? this (may) help you get started

http://stackoverflow.com/questions/1821806/how-to-encode-png-to-buffer-using-libpng[^]

[Edit] that example may not quite be the one you need, but Im pretty sure libpng has the guts of what you need[/Edit]

'g'

Randor 23-Sep-13 15:00

Randor

23-Sep-13 15:00

Hi,

If you are on the Microsoft Windows operating system and don't mind using the GDI+ library then you could use the Bitmap Class[^] which inherits from the Image Class[^] that has an Image::Save[^] method and can be used for image encoding[^].

Best Wishes,
-David Delaune

Don Guy23-Sep-13 15:19

Don Guy

23-Sep-13 15:19

Yes i am using MFC in Visual Studio 2012 IDE.

Does Image Encoding can convert raw image date to PNG format?

I know Image.Save() can save a BMP file in PNG or JPG format, but here the purpose is not convert and save into the hard drive. But i want the PNG formatted data, which can be later used for other purposes.

Randor 23-Sep-13 18:07

Randor

23-Sep-13 18:07

Hi,

Don Guy wrote:
Does Image Encoding can convert raw image date to PNG format?

No

I gave you a link to the Bitmap Class[^]. You should consider using one of these class constructors to generate your Bitmap object.

Bitmap.Bitmap(INT, INT, INT, PixelFormat, BYTE*) constructor[^]
Bitmap.Bitmap(const BITMAPINFO*, VOID*) constructor[^]

Don Guy wrote:
I know Image.Save() can save a BMP file in PNG or JPG format, but here the purpose is not convert and save into the hard drive. But i want the PNG formatted data, which can be later used for other purposes.

Great. Since you already know that you can call Image.Save[^] to save to disk. Then surely you would know that you can also save to an in-memory IStream[^]:

Image.Save(IStream*, const CLSID*, const EncoderParameters*) method[^]

Here is an example from one of my personal projects. In this project I am taking screenshots of websites via the Webkit backing store and converting them to PNG image thumbnails and serving them over HTTP. This example reads from a HBITMAP to a Bitmap object then saves as an encoded PNG image into an in-memory IStream.

C++

BYTE * WebKitWnd::GetPNGImageFromBackingStore(UINT& iLength)
{
	BYTE *pRet = nullptr;
	iLength = 0;

	CDC memDC;
	memDC.CreateCompatibleDC(NULL);

	DIBSECTION ds;
	BITMAPINFOHEADER &bmInfo = ds.dsBmih;
	if(NULL != m_hBacking && NULL != ::GetObject(m_hBacking, sizeof(ds), &ds))
	{
		Bitmap bmp(m_hBacking,NULL);
		Graphics g(&bmp);
		CLSID  encoderClsid;
		BYTE *png_buffer = nullptr;
		if(TRUE == GetEncoderClsid(L"image/png", &encoderClsid))
		{
			IStream *buffer;
			VERIFY_SUCCEEDED(::CreateStreamOnHGlobal(NULL, FALSE, &buffer));
			bmp.Save(buffer,&encoderClsid,NULL);
			STATSTG statstg;
			VERIFY_SUCCEEDED(buffer->Stat(&statstg, STATFLAG_DEFAULT));
			ULONG m_bmpBufferSize = (ULONG)statstg.cbSize.LowPart;
			BYTE *png_buffer = new(std::nothrow) BYTE[m_bmpBufferSize];
			if(png_buffer)
			{
				LARGE_INTEGER li = {0};
				buffer->Seek(li, STREAM_SEEK_SET, NULL);
				ULONG m_nRead;
				buffer->Read(png_buffer,m_bmpBufferSize, &m_nRead);
				pRet = png_buffer;
				iLength = m_bmpBufferSize;
				buffer->Release();
			}
		}
	}
	memDC.DeleteDC();
	return pRet;
}

Best Wishes,
-David Delaune