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To be more specific :
The context where i want to clear buffer is somewhat as follows :
The device which is attached to the COM port is sujected to a specific Baudrate, parity, databit and stopbit, whose values i do not know beforehand. so i send the command for all combinations of baudrate, parity, databit stopbits.
During the process i receive junk/unnecessary response for a wrong combination, and i get correct/ expected response only for correct combination of baudrate, parity, databibit and stopbit.
so i want only to read the correct response and ignore others !
I know correct value starts with a specific value, so when ever there is a response starting with the specific value, I read it else I ignore it.
Now for the responses which I get for wrong combination donot start with a specific value so I ignore them hence they get accumulated in the buffer, now when the correct combination is reached and I try to read the response it starts with previous junk values as this response doesnot start with my specific value so it gets ignored in way I lose my correct response also, so I want to clear the buffer befor I send my command.
Thanks !
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Are you perchance in search of PurgeComm[^]?
Judy
Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
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PurgeComm clears the buffer of the device's driver, i want to clear the buffer of the Serial COM port of my computer !!
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kapardhi wrote: PurgeComm clears the buffer of the device's driver, i want to clear the buffer of the Serial COM port of my computer !!
Which part of (the first sentence in the link)
Discards all characters from the output or input buffer of a specified communications resource
is unclear? A COM port is a communications resource. The buffers for a comm resource are maintained by the device driver for that resource.
Judy
Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
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hi all
i want to create a .DBX file having some mails.
can anybody tell me how to create a .DBX file(MS-OUTLOOK EXPRESS)
using vc++ 6.0
Thanks in advance.
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I have a handle to bitmap. I need to store this bitmap to a xml file. The xml file will be read on a mac system.
So how do I create a DIB from a HBITMAP?
Thanks..
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That is not what I require. Not from a file. I already have a HBITMAP from the file. I need a logic that converts a HBITMAP to a DIB, which will be readable on a mac system.
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2. Use CreateDIBSection to create an image of the correct size
3. Create a couple of memory DCs
4. Select the images into their own DCs
5. BitBlt from the DC holding the HBITMAP to the one containing the DIBSection
6. Save the DIBSection to disk (you can use the supplied function)
7. Deselect the images from their DCs
8. DeleteObject both images (HBITMAP & DIBSection)
BOOL SaveBitmapFile(HDC p_hDC, LPCTSTR p_pchFileName)
{
HBITMAP hBmp = (HBITMAP)GetCurrentObject( p_hDC, OBJ_BITMAP );
BITMAPINFO stBmpInfo;
stBmpInfo.bmiHeader.biSize = sizeof( stBmpInfo.bmiHeader );
stBmpInfo.bmiHeader.biBitCount = 0;
GetDIBits( p_hDC, hBmp, 0, 0, NULL, &stBmpInfo, DIB_RGB_COLORS );
ULONG iBmpInfoSize;
switch( stBmpInfo.bmiHeader.biBitCount )
{
case 24:
iBmpInfoSize = sizeof(BITMAPINFOHEADER);
break;
case 16:
case 32:
iBmpInfoSize = sizeof(BITMAPINFOHEADER)+sizeof(DWORD)*3;
break;
default:
iBmpInfoSize = sizeof(BITMAPINFOHEADER) +
sizeof(RGBQUAD) * ( 1 << stBmpInfo.bmiHeader.biBitCount );
break;
}
PBITMAPINFO pstBmpInfo;
if( iBmpInfoSize != sizeof(BITMAPINFOHEADER) )
{
pstBmpInfo = (PBITMAPINFO)GlobalAlloc( GMEM_FIXED | GMEM_ZEROINIT, iBmpInfoSize );
PBYTE pbtBmpInfoDest = (PBYTE)pstBmpInfo;
PBYTE pbtBmpInfoSrc = (PBYTE)&stBmpInfo;
ULONG iSizeTmp = sizeof( BITMAPINFOHEADER );
while( iSizeTmp-- )
{
*( ( pbtBmpInfoDest )++ ) = *( ( pbtBmpInfoSrc )++ );
}
}
HANDLE hFile = CreateFile( p_pchFileName, GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_ARCHIVE,
NULL );
BITMAPFILEHEADER stBmpFileHder;
stBmpFileHder.bfType = 0x4D42;
stBmpFileHder.bfSize = sizeof(BITMAPFILEHEADER)
+ sizeof(BITMAPINFOHEADER)
+ iBmpInfoSize
+ pstBmpInfo->bmiHeader.biSizeImage;
stBmpFileHder.bfReserved1 = 0;
stBmpFileHder.bfReserved2 = 0;
stBmpFileHder.bfOffBits = sizeof(BITMAPFILEHEADER) + iBmpInfoSize;
DWORD dRet;
WriteFile( hFile, (LPCVOID)&stBmpFileHder , sizeof(BITMAPFILEHEADER), &dRet, NULL );
PBYTE pBits = (PBYTE)GlobalAlloc( GMEM_FIXED | GMEM_ZEROINIT, stBmpInfo.bmiHeader.biSizeImage );
HBITMAP hBmpOld;
HBITMAP hTmpBmp = CreateCompatibleBitmap( p_hDC,
pstBmpInfo->bmiHeader.biWidth,
pstBmpInfo->bmiHeader.biHeight );
hBmpOld = (HBITMAP)SelectObject( p_hDC, hTmpBmp );
GetDIBits( p_hDC, hBmp, 0, pstBmpInfo->bmiHeader.biHeight,
(LPSTR)pBits, pstBmpInfo, DIB_RGB_COLORS );
WriteFile( hFile, (LPCVOID)pstBmpInfo, iBmpInfoSize, &dRet, NULL );
WriteFile( hFile, (LPCVOID)pBits, pstBmpInfo->bmiHeader.biSizeImage, &dRet, NULL );
SelectObject( p_hDC, hBmpOld );
DeleteObject( hTmpBmp );
CloseHandle( hFile );
GlobalFree( pstBmpInfo );
GlobalFree( pBits );
return TRUE;
}
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Thanks for your reply.
Do you think writing the DIB to a xml file and reading back and displaying it will actually display it?
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Do you think writing the DIB to a xml file and reading back and displaying it will actually display it?
Well that is the tricky part - it is important to choose what kind of DIB you want, so you can read it latter on Mac:
- choose how many colors
- by default DIB is bottom-up. If Mac can't read it put negative height in DIB
- if Mac can read .bmp, consider writing the file in .bmp rather .xml (this will greatly reduce file size and writing routines to read .xml)
Good luck.
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My pleasure.
Sure, writing a bitmap to an XML file will work, it'd just be more work than saving the DIBSection to a BMP file (the code supplied will create a BMP file)
You'll be able to open the created file with photoshop or any other image program that supports BMP. I wrote the code from scratch, the BMP format is really fairly simple. Just use your preferred method, either would work.
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I cant use a bmp file, because bmp is not the only info I need to send to the mac. I want to club whole info into a single xml file, transfer it, and then disintegrate it on the mac. 
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What image format does the bitmap need to be in for the Mac to read it?
It seems to me there's three steps here:
1) Write the DDB to an image stream in some Mac-recognizable format
2) Send the stream bytes via XML
3) Extract the byte stream into an image
Which part is giving you trouble?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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The first part.
1) Write the DDB to an image stream in some Mac-recognizable format
I thought of writing the BITMAP structure field by field to the xml, including the color bits(pBmBits field). I convert this bmbits field to string before writing. Somehow the size of the xml file after writing the image data increases to 6MB, while the image is only 66KB.
Is it OK to convert it to string before writing?
How can I convert it to a stream?
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ThisIsMeRon wrote: Write the DDB to an image stream in some Mac-recognizable format
What would that format be?
Do you need to break apart the bitmap and just send basic info like
height, width, bits-per-pixel, and the pixel bits?
Or can you send a stream of a "universal" image format like TIFF, JPEG, etc.
(the Mac probably reads BMPs fine as well I would think).
66K to 6MB .... definitely something wrong there 
Even if you send a base64 representation of the binary data, you should
only see an increase of 33%.
Mark Salsbery
Microsoft MVP - Visual C++
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Use the CopyImage function.
HBITMAP DIBBitmap = CopyImage(DDBBitmap, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION)
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good - Use it!
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Hi,
I will like to know which C++ compiler implements the most complete C++ and STL Specification/Standards as of today?
Also what is the state of latest C++0.x specification (as of today) and conformance of the current compilers?
Thanks and Regards
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Hi all,
I have to rename the Ok and cancel of a message Box
AfxMessageBox("Message ", "Name", MB_OK | MB_SYSTEMMODAL);
i want to change the name of Ok--->update
Cancel--->dont Update
can you help me..
vikas da
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you can create your own dialog and make it look similar to a message box. A simpler technique...
You need to google first, if you have "It's urgent please" mentioned in your question.
 _AnShUmAn_
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When running on Vista and later, you can use a task dialog for that. Otherwise, for earlier OSes, you'll need a custom-written dialog as the other replies have suggested.
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Hi,
I have creted a MFC SDI project in VC 2008 and compiled in Vista OS. Now when i copied the project into XP OS system and opened. I can open all views(class view, solution explorer...) but the resource view...
it is showing a MessageBox stating
A resource in file uses an unknown language:English(U.S.)(unknown sub-lang:0x10).
Unable to open this file.
Did anybody come across this problem...
Thank you.
Tritva
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Open your resource script file, and delete this part from it:
/////////////////////////////////////////////////////////////////////////////
// English (U.S.) (unknown sub-lang: 0x10) resources
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENN)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, 0x10
#pragma code_page(1252)
#endif //_WIN32
/////////////////////////////////////////////////////////////////////////////
//
// RT_MANIFEST
//
2 RT_MANIFEST "XenonOcx.manifest"
#endif // English (U.S.) (unknown sub-lang: 0x10) resources
/////////////////////////////////////////////////////////////////////////////
It solves your problem.
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I dont seem to be displaying any text
would anyone know what I am doing wrong
Stor_edit = GetDlgItem(hwndDlg,IDC_EDIT3);
<br />
SendMessage(Stor_edit,EM_POSFROMCHAR,(WPARAM) 1, NULL);
<br />
x = LOWORD(myresult);<br />
<br />
y = HIWORD(myresult);<br />
<br />
mydc = GetDC(Stor_edit);<br />
<br />
SetTextColor(mydc, RGB(255,0,0));<br />
<br />
SetBkColor(mydc, RGB(255,255,0));<br />
<br />
SelectObject(mydc,CreateSolidBrush(RGB(255,255,206,0)));<br />
<br />
GetTextMetrics(mydc,&mytext);<br />
<br />
x = x * mytext.tmOverhang;<br />
<br />
y = y * mytext.tmHeight;<br />
<br />
TextOut(mydc,x,y,"Test String",10);<br />
<br />
ReleaseDC(Stor_edit,mydc);<br />
<br />
return TRUE;
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