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ReplyOriginally posted by: Russ Lewis
Here's my copy of this solution, however I still
get the Gray box on the paste operation to mspaint. Any ideas/suggestions?
wglMakeCurrent() returns FALSE but the extended error
message returns "The operation completed successfully."
according to Platform SDK: OpenGL --
When the wglMakeCurrent function succeeds, the return value is TRUE; otherwise the return value is FALSE.
what's up with this?
thanks for any help.
void CSimpleSDIGLView::SnapClient()
{
BeginWaitCursor();
// Get client geometry
CRect rect;
GetClientRect(&rect);
CSize size(rect.Width(),rect.Height());
TRACE(" client zone : (%d;%d)\n",size.cx,size.cy);
// Lines have to be 32 bytes aligned, suppose 24 bits per pixel
// I just cropped it
size.cx -= size.cx % 4;
TRACE(" final client zone : (%d;%d)\n",size.cx,size.cy);
// Create a bitmap and select it in the device context
// Note that this will never be used ;-) but no matter
CBitmap bitmap;
CDC *pDC = GetDC();
CDC MemDC;
VERIFY(MemDC.CreateCompatibleDC(NULL));
VERIFY(bitmap.CreateCompatibleBitmap(pDC,size.cx,size.cy));
MemDC.SelectObject(&bitmap);
// Alloc pixel bytes
int NbBytes = 3 * size.cx * size.cy;
unsigned char *pPixelData = new unsigned char[NbBytes];
if( FALSE == wglMakeCurrent(m_OpenGLCtrl.getDC(), m_OpenGLCtrl.getRC()))
{
AfxMessageBox("FALSE from wglMakeCurrent");
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
// Process any inserts in lpMsgBuf.
// ...
// Display the string.
AfxMessageBox( (LPCTSTR)lpMsgBuf);
// Free the buffer.
LocalFree( lpMsgBuf );
}
// Copy from OpenGL
::glReadPixels(0,0,size.cx,size.cy,GL_BGR_EXT,GL_UNSIGNED_BYTE,pPixelData);
// Fill header
BITMAPINFOHEADER header;
header.biWidth = size.cx;
header.biHeight = size.cy;
header.biSizeImage = NbBytes;
header.biSize = 40;
header.biPlanes = 1;
header.biBitCount = 3 * 8; // RGB
header.biCompression = 0;
header.biXPelsPerMeter = 0;
header.biYPelsPerMeter = 0;
header.biClrUsed = 0;
header.biClrImportant = 0;
// Generate handle
HANDLE handle = (HANDLE)::GlobalAlloc (GHND,sizeof(BITMAPINFOHEADER) + NbBytes);
if(handle != NULL)
{
// Lock handle
char *pData = (char *) ::GlobalLock((HGLOBAL)handle);
// Copy header and data
memcpy(pData,&header,sizeof(BITMAPINFOHEADER));
memcpy(pData+sizeof(BITMAPINFOHEADER),pPixelData,NbBytes);
// Unlock
::GlobalUnlock((HGLOBAL)handle);
// Push DIB in clipboard
OpenClipboard();
EmptyClipboard();
SetClipboardData(CF_DIB,handle);
CloseClipboard();
}
// Cleanup
MemDC.DeleteDC();
bitmap.DeleteObject();
delete [] pPixelData;
EndWaitCursor();
}
Originally posted by: Shujie
I use VC++ and OpenGL. I want to save a graphic as a JPG file. How can I do it?
Thanks!
Originally posted by: Miguel
Can you help me in the following thing.?
I need to capture the total screen, without having to use the BitBlt(...) function because this it takes a long time 450 mseg approximately. Does exists some method in OpenGL to make it. Or otherwise, witch library I should to use?.
Thank you.
Miguel
Originally posted by: lee
Please send to me thisfile(facedrawing)
Originally posted by: Eyal Ron
Here is what I've tried:
int nColors = bmpHeader->biClrUsed ? bmpHeader->biClrUsed : 1 << bmpHeader->biBitCount;
LPVOID lpDIBBits;
CDC bmpDC;
dc->StartDoc(&docinfo);
::GlobalFree(global);
|Nothing is printed. What am I doing wrong?
How can I get the from the clipboard
and print it?
OpenClipboard();
HGLOBAL global = (HGLOBAL)GetClipboardData(CF_DIB);
BITMAPINFOHEADER* bmpHeader = (LPBITMAPINFOHEADER)global;
BITMAPINFO* bmpInfo = (LPBITMAPINFO)global;
EmptyClipboard();
CloseClipboard();
if (bmpInfo->bmiHeader.biBitCount>8)
lpDIBBits = (LPVOID)((LPDWORD)(bmpInfo->bmiColors + bmpInfo->bmiHeader.biClrUsed) + ((bmpInfo->bmiHeader.biCompression==BI_BITFIELDS) ? 3 : 0));
else
lpDIBBits = (LPVOID)(bmpInfo->bmiColors + nColors);
bmpDC.CreateCompatibleDC(dc);
HBITMAP hBitmap = CreateDIBitmap(bmpDC.m_hDC, bmpHeader, CBM_INIT, lpDIBBits, bmpInfo, DIB_RGB_COLORS);
if (hBitmap==NULL) return;
dc->StartPage();
dc->BitBlt(0, 0, 500, 500, &bmpDC, 0, 0, SRCCOPY);
dc->EndPage();
dc->EndDoc();
// bmpDC.SelectObject(pOldBmp);
bmpDC.DeleteDC();
dc->SelectObject(pOldFont);
delete printDlg;
DeleteDC(hDc);
dc->Detach();
dc->DeleteDC();
Originally posted by: Sanjay S. Bora
Regds & Thanks
Sanjay
Very Good Article. It helped me lot.
But it doesnt work on Win'98.
Originally posted by: Armen
I am admirer of your great articles both in CodeGuru and
CodeProject sites.
How can i get this sourse code with workspace ?