IDebugPendingBreakpoint2::CanBind

Artikkeli
01/12/2024

Determines whether this pending breakpoint can bind to a code location.

Syntax

int CanBind ( 
   out IEnumDebugErrorBreakpoints2 ppErrorEnum
);

HRESULT CanBind ( 
   IEnumDebugErrorBreakpoints2** ppErrorEnum
);

Parameters

ppErrorEnum
[out] Returns an IEnumDebugErrorBreakpoints2 object that contains a list of IDebugErrorBreakpoint2 objects if there could be errors.

Return Value

If successful, returns S_OK. Returns S_FALSE if the breakpoint cannot bind, in which case the errors are returned by the ppErrorEnum parameter. Otherwise, returns an error code. Returns E_BP_DELETED if the breakpoint has been deleted.

Remarks

This method is called to determine what would happen if this pending breakpoint was bound. Call the Bind method to actually bind the pending breakpoint.

Example

The following example shows how to implement this method for a simple CPendingBreakpoint object that exposes the IDebugPendingBreakpoint2 interface.

HRESULT CPendingBreakpoint::CanBind(IEnumDebugErrorBreakpoints2** ppErrorEnum)
{
   HRESULT hr;
   HRESULT hrT;

   // Check for a valid pointer to an error breakpoint enumerator
   // interface; otherwise, return hr = E_INVALIDARG.
   if (ppErrorEnum)
   {
      // Verify that the pending breakpoint has not been deleted. If
      // deleted, then return hr = E_BP_DELETED.
      if (m_state.state != PBPS_DELETED)
      {
         // Verify that the breakpoint is a file/line breakpoint.
         if (IsFlagSet(m_pBPRequest->m_bpRequestInfo.dwFields, BPREQI_BPLOCATION) &&
             m_pBPRequest->m_bpRequestInfo.bpLocation.bpLocationType == BPLT_CODE_FILE_LINE)
         {
            hr = S_OK;
         }
         // If the breakpoint type is not a file/line breakpoint, then the
         // result should be an error breakpoint.
         else
         {
            // If the error breakpoint member variable does not have
            // allocated memory.
            if (!m_pErrorBP)
            {
               // Create, AddRef, and initialize a CErrorBreakpoint object.
               if (CComObject<CErrorBreakpoint>::CreateInstance(&m_pErrorBP) == S_OK)
               {
                  m_pErrorBP->AddRef();
                  m_pErrorBP->Initialize(this);
               }
            }

            // Create a new enumerator of error breakpoints.
             CComObject<CEnumDebugErrorBreakpoints>* pErrorEnum;
            if (CComObject<CEnumDebugErrorBreakpoints>::CreateInstance(&pErrorEnum) == S_OK)
            {
               // Get the IDebugErrorBreakpoint2 information for the
               // CErrorBreakpoint object.
               CComPtr<IDebugErrorBreakpoint2> spErrorBP;
               hrT = m_pErrorBP->QueryInterface(&spErrorBP);
               assert(hrT == S_OK);
               if (hrT == S_OK)
               {
                  // Initialize the new enumerator of error breakpoints
                  // with the IDebugErrorBreakpoint2 information.
                  IDebugErrorBreakpoint2* rgpErrorBP[] = { spErrorBP.p };
                  hrT = pErrorEnum->Init(rgpErrorBP, &(rgpErrorBP[1]), NULL, AtlFlagCopy);
                  if (hrT == S_OK)
                  {
                     // Verify that the passed IEnumDebugErrorBreakpoints2
                     // interface can be successful queried by the
                     // created CEnumDebugErrorBreakpoints object.
                     hrT = pErrorEnum->QueryInterface(ppErrorEnum);
                     assert(hrT == S_OK);
                  }
               }

               // Otherwise, delete the CEnumDebugErrorBreakpoints object.
               if (FAILED(hrT))
               {
                  delete pErrorEnum;
               }
            }

            hr = S_FALSE;
         }
      }
      else
      {
         hr = E_BP_DELETED;
      }
   }
   else
   {
      hr = E_INVALIDARG;
   }

   return hr;
}

Jaa