virtual L_INT LBase::StatusCallBack (nPercentComplete)
Override this function to update a status bar or interrupt the calling function's operation.
An integer from 0 to 100 that indicates the completion percentage of the function that uses the callback.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
Derived classes can override this function to update a status bar or interrupt the calling function's operation.
This generalized callback function can be called by many different C++ Class Library functions. If this function returns a failure, the calling function will terminate and return the same error that the callback returned. Override this function in your derived class if you want to have control over the function in process. This function will be called only if the status callback is enabled for the class object.
Win32, x64.
class LStatusBitmap : public LBitmap
{
public:
LStatusBitmap();
virtual L_INT StatusCallBack(L_INT nPercentComplete);
virtual ~LStatusBitmap();
};
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
////////////////////////////////////////////////////////////////////
LStatusBitmap::LStatusBitmap()
{
}
LStatusBitmap::~LStatusBitmap()
{
}
L_INT LStatusBitmap::StatusCallBack(L_INT nPercentComplete)
{
// display a message when 30% of the status is done.
if(nPercentComplete == 30)
{
MessageBox(NULL, TEXT("30 Percent of AddNoise function is completed."), TEXT("StatusCallBack"), MB_OK);
}
return SUCCESS;
}
L_INT LBase__StatusCallBackExample(HWND hWnd)
{
L_INT nRet;
LStatusBitmap LeadBitmap;
HDC hDC;
RECT rcClientRect;
// get DC
hDC = GetDC(hWnd);
GetClientRect(hWnd, &rcClientRect);
//Load an image
nRet = LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("IMAGE1.cmp")), 0,ORDER_BGR);
if(nRet != SUCCESS)
return nRet;
// Check if StatusCallBack is already enabled
nRet = LeadBitmap.IsStatusCallBackEnabled();
if(nRet == FALSE)
{
// Enable Status CallBack
LeadBitmap.EnableStatusCallBack(TRUE);
}
// Call add noise function
// during the calling of this function
// StatusCallBack will be called
nRet = LeadBitmap.AddNoise();
if(nRet != SUCCESS)
return nRet;
// Paint the image
LeadBitmap.Paint()->SetDC(hDC);
nRet = LeadBitmap.SetDstRect(&rcClientRect);
if(nRet != SUCCESS)
return nRet;
nRet = LeadBitmap.Paint()->PaintDC();
if(nRet != SUCCESS)
return nRet;
ReleaseDC(hWnd, hDC);
return SUCCESS;
}
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