C / C++ / MFC

SHORT rbstate = GetAsyncKeyState(VK_RBUTTON);
if (!rbstate) {
    return;
}

BEGIN_MESSAGE_MAP(CMyPreviewView, CPreviewView)
	ON_COMMAND(AFX_ID_PREVIEW_PRINT, &CMyPreviewView::OnPreviewPrint) // this called when print button is pressed
END_MESSAGE_MAP()

<small>void CMyPreviewView::OnPreviewPrint()
{
// assuming you want to print the view
	m_pOrigView->SendMessage(WM_COMMAND, ID_FILE_PRINT);
}</small>

<small>void CMyViewToBePrinted::OnFilePrintPreview()
{
	// In derived classes, implement special window handling here
	// Be sure to Unhook Frame Window close if hooked.

	// must not create this on the frame.  Must outlive this function
	CPrintPreviewState* pState = new CPrintPreviewState;

	TRY
	{
		// DoPrintPreview's return value does not necessarily indicate that
		// Print preview succeeded or failed, but rather what actions are necessary
		// at this point.  If DoPrintPreview returns TRUE, it means that
		// OnEndPrintPreview will be (or has already been) called and the
		// pState structure will be/has been deleted.
		// If DoPrintPreview returns FALSE, it means that OnEndPrintPreview
		// WILL NOT be called and that cleanup, including deleting pState
		// must be done here.

		if (!DoPrintPreview(AFX_IDD_PREVIEW_TOOLBAR, this,
								RUNTIME_CLASS(CMyPreviewView), pState))
		{
			// In derived classes, reverse special window handling here for
			// Preview failure case

			TRACE(traceAppMsg, 0, "Error: DoPrintPreview failed.\n");
			AfxMessageBox(AFX_IDP_COMMAND_FAILURE);
			delete pState;      // preview failed to initialize, delete State now
		}
	}
	CATCH_ALL(e)
	{
		delete pState;
		THROW_LAST();
	}
	END_CATCH_ALL
}</small>

<small>BEGIN_MESSAGE_MAP(CMyViewToBePrinted, CView)
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CMyViewToBePrinted::OnFilePrintPreview)
END_MESSAGE_MAP()</small>

alfalf3 wrote:

Have you experience the same problem?

alfalf3 wrote:

any idea on how to do so?

BOOL SaveBmpTo12BitsFile(HBITMAP hBmp, HANDLE hFile);
HBITMAP LoadBmpFrom12BitsFile(HANDLE hFile);

// Encoding

unsigned short s1 = 10;
unsigned short s2 = 20;

BYTE b1 = (s1 & 0x0FF0) >> 4;

BYTE b2 = (s1 & 0x000F) << 4;
b2 |= (s2 & 0x0F00) >> 8;

BYTE b3 = s2 & 0x00FF;

// Decoding

s1 = b1 << 4;
s1 |= (b2 & 0xF0) >> 4;

s2 = (b2 & 0x0F) << 8;
s2 |= b3;

typedef struct _PackedUShort
{
 unsigned char b0 : 4;
 unsigned char b1 : 4;
 unsigned char b2 : 4;
 unsigned char b3 : 4;
} PackedUShort;

typedef union 
{
 unsigned short us;
 PackedUShort pack;
} PackedData;

packBuf = (PackedData*) myImageBuffer;

// allocate new buffer
resultBuf = (PackedData*) malloc(sizeof(PackedData) * newSize);

for(i=0; i<imagesize;>{
  int position = j % 4;

  switch(position) 
  {
    case 0:
	(*resultBuf).pack.b0 = (*packBuf).pack.b0;
	(*resultBuf).pack.b1 = (*packBuf).pack.b1;
	(*resultBuf).pack.b2 = (*packBuf).pack.b2;
	break;
    case 1:
	(*resultBuf).pack.b1 = (*packBuf).pack.b0;
	(*resultBuf).pack.b2 = (*packBuf).pack.b1;
	(*resultBuf).pack.b3 = (*packBuf).pack.b2;
	resultBuf++;
	break;
    case 2:
	(*resultBuf).pack.b2 = (*packBuf).pack.b0;
	(*resultBuf).pack.b3 = (*packBuf).pack.b1;
	resultBuf++;
	(*resultBuf).pack.b0 = (*packBuf).pack.b2;
	break;
    case 3:
	(*resultBuf).pack.b3 = (*packBuf).pack.b0;
	resultBuf++;
	(*resultBuf).pack.b0 = (*packBuf).pack.b1;
	(*resultBuf).pack.b1 = (*packBuf).pack.b2;
	break;
    }
    j+=3;
    packBuf++;
  }
}