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And if just Win32, is my method correct?
Maxwell Chen
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Hello Sir
i project is in VC(MFC)
I have two lan cards in my Server in such a way that Lan Card a1 is connected to internet and holds Public IP infomration and Lan card a2 is meant for private internal network and holds internal IP information and connects to client machines in my internal network.
In my coding want to develop a module that can enable me to find realtime IP addresses and/or computer name of the Client machines that are using internet via server in my internal network.
Plz help me.....I want source code or tips or Link..
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Are you looking for WinPcap- the packet monitoring driver with API? You need to design an APP with winpcap and run that on server. You can monitor anything.
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mirtu wrote: In my coding want to develop a module that can enable me to find realtime IP addresses and/or computer name of the Client machines that are using internet via server in my internal network.
what about RAW Sockets (SOCK_RAW), eventhough there are controversy using RAW Socket, i think with administrative priviledge, your application can use RAW Socket, through RAW Sockets you can get the IP packets header to find the IP addresses.
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I try to define some map that will hold tree item and its data.
But when i define this strut ( below ) i getting almost million of warning.
What is my mistake ?
<br />
std::map<HTREEITEM, StaticStructer::iterator> m_ContainerMap;<br />
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What are the warnings ? What version of VC are you using ? VC6 standard STL sucks.
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Yes ... its VC6 
I have here so much warnings ... i cant add them all to here.
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std::map<HTREEITEM, StaticStructer::iterator> m_ContainerMap;
doesnot seems to have compilation problem, provided StaticStructer is declared well to use it here.
and a side note: IMHO, storing iterator is not a good choice.
Yanshof wrote: I have here so much warnings ... i cant add them all to here.
how do you determined all these warning are due to the above code statement. u can post some messages, in most cases we cannot fix the warning, if we are strictly saying that, we can fix only if all the warnings are addressed simultaneously.
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I suppose that there is only one single warning type (about long variable names or something like that) ?
If that's the case, it's a known problem and you can safely ignore the warnings. You can disable them by going into the project properties and specify a specific warning to be disabled (sorry, don't have VC6 here so I can't point you to the exact location).
To be sure, just post the warning number here.
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i am using the freeimage library to display 32 bit bitamp with alpha
channel . I am using the following code
//--------------------------------------------
::SetDIBitsToDevice(
pDC->m_hDC, // handle to DC
xDst, yDst, // x-y-coord of destination upper-left corner
dxSrc, dySrc, // width-height of source rectangle
xSrc, ySrc, // x-y-coord of source upper-left corner
0,//uStartScan,// first scan line in array
FreeImage_GetHeight(pFIBitmap), // number of scan lines
FreeImage_GetBits(pFIBitmap), // array of DIB bits
FreeImage_GetInfo(pFIBitmap), // bitmap information
DIB_RGB_COLORS); // RGB or palette indexes
//-----------------------------------------------------------
In my 32 bit bitmap alpha channel value is 0 i.e must be transparent
on rendering device context. but is it not happening it is not
transparent (FULL BLACK). same problem occuring with 32 bit targa files
can any one suggest me the solution ????
Trioum
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AFAIK, there's no alpha channel support in GDI. There's no BITMAPINFO type that represents 32-bit ARGB
format.
GDI+ will work though.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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But GDI+ is not displaying 32 bit bitmap and targa files.
I try a lot (googling MSDN)
how can I do it ????????.
Trioum
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The 32-bit GDI device-independent-bitmap format is either BI_BITFIELDS, where a bitmask
determines which bits of the 32 represent the red/green/blue compnents, or BI_RGB, where
each 32-bit pixel DWORD is in 0BGR format (the extra byte is ignored).
A GDI+ Image or Bitmap, however, can be created with the format PixelFormat32bppARGB, and
the Graphics class DrawImage() methods will honor the per-pixel alpha channel bytes, as long as
the compositing mode is set correctly (CompositingModeSourceOver).<mshelp:keyword index="K" term="CompositingModeSourceCopy" vtopic="CompositingModeSourceCopy">
I don't know anything about the graphics library you're using, but you should be able to create
a GDI+ Bitmap object from the bitmap info you have, using one of the Bitmap class constructors.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Now I write the following code with GDI+
Gdiplus::Graphics graphics(hdc); //Handle to the device context
//Load the image from a file
Gdiplus::Image image(L"file.bmp",FALSE);
graphics.DrawImage(&image,0,0,image.GetWidth(), image.GetHeight());
this is working fine with 24bit bmp jpeg png jif etc but not working
with 32 bit bitmap and targa files.
although as you write above then how can I draw the bitmap using
drawimage() method if I create it by Bitmap constructor
static Bitmap* FromFile() . as Drawimage() method always take Image()
constructor reference as its first variable not Bitmap().
Trioum
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Bitmap is derived from Image, so you can pass a Bitmap object to DrawImage. 
GDI+ doesn't load targa files AFAIK, so you'll need to load those some other way.
BMP, GIF, JPEG, EXIF, PNG, and TIFF are loadable by GDI+.
Whatever solution you use - A DIBSection and AlphaBlend() like Chris suggested, or GDI+
like I suggested, you'll probably need to load the image with your library, and if the library doesn't
support rendering the image, then you'll need to convert the loaded image to one of the GDI(+)
types mentioned.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: AFAIK, there's no alpha channel support in GDI.
sure there is: AlphaBlend[^]
Mark Salsbery wrote: There's no BITMAPINFO type that represents 32-bit ARGB
format.
DIBs (and HBITMAPs) can certainly handle 32-bit BGRA.
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AlphaBlend() is for DDBs, and only DIBSections support ARGB.
That combo is indeed a solution, but why, when GDI+ provides much more support?
Cheers,
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: AlphaBlend() is for DDBs
well, sure, but it's a trivial matter to get from a DIB to an HBITMAP.
Mark Salsbery wrote: but why, when GDI+ provides much more support?
that's something only the OP can address...
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Chris Losinger wrote: a trivial matter to get from a DIB to an HBITMAP
Ok. It's also trivial to make a GDI+ Bitmap from a DIB.
The OP has been provided two possible solutions. Both rely on getting the alpha channel data from
his source pixel data, which is the real problem. The rendering is easy, but SetDIBitsToDevice
isn't going to do it.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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convert your DIB to an HBITMAP, then use AlphaBlend to draw the HBTIMAP
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I tried lot of coding but could not success . can any one send me the piece of code so that I solve my problem.
Trioum
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If I knew anything about the third party libary you use to load the image,
I could easily send you a code sample.
The library doesn't have any rendering code for ARGB images?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Note this assumes the FreeImage image is 32bpp with alpha channel...
<font color="Green">
LONG lImageWidth = FreeImage_GetWidth(pFIBitmap);
LONG lImageHeight = FreeImage_GetHeight(pFIBitmap);
WORD wBitsPerPixel = 32;
LONG lBytesPerRow = (((lImageWidth * (long)wBitsPerPixel + 31L) & (~31L)) / 8L);
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = lImageWidth;
bmi.bmiHeader.biHeight = lImageHeight;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = wBitsPerPixel;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = lBytesPerRow * lImageHeight;
<font color="Green">
HDC hdc = ::CreateCompatibleDC(0);
BYTE* pBitmapBits;
HBITMAP hBitmap = ::CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, (void**)&pBitmapBits, NULL, 0);
if (hBitmap)
{
<font color="Green">
<font color="Green">
memcpy(pBitmapBits, FreeImage_GetBits(pFIBitmap), bmi.bmiHeader.biSizeImage);
HGDIOBJ hOldBitmap = ::SelectObject(hdc, hBitmap);
HDC hClientDC = ::GetDC(hwndWindowToDrawOn);
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 0xFF;
bf.AlphaFormat = AC_SRC_ALPHA;
::AlphaBlend(hClientDC, 0, 0, lImageWidth, lImageHeight,
hdc, 0, 0, lImageWidth, lImageHeight, bf);
::ReleaseDC(hwndWindowToDrawOn, hClientDC);
::SelectObject(hdc, hOldBitmap);
::DeleteObject(hBitmap);
}
::DeleteDC(hdc);
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Thanks mark it is working with 32 bit bmp file,but it changes the
alpha value of whole pixels not alpha channel that I wants.
Trioum
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trioum wrote: it changes the
alpha value of whole pixels not alpha channel that I wants.
Huh? What does it do and what do you want?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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