IDebugPendingBreakpoint2::CanBind
确定此挂起的断点是否可以绑定到代码位置。
语法
参数
ppErrorEnum
[out]返回一个 IEnumDebugErrorBreakpoints2 对象，该对象包含 IDebugErrorBreakpoint2 对象列表（如果可能存在错误）。
返回值
如果成功，则返回 S_OK. 返回 S_FALSE 断点无法绑定的情况，在这种情况下，参数将返回 ppErrorEnum 错误。 否则，返回错误代码。 返回 E_BP_DELETED 是否已删除断点。
备注
调用此方法以确定如果绑定了此挂起的断点，会发生什么情况。 调用 Bind 方法以实际绑定挂起的断点。
示例
以下示例演示如何为公开 IDebugPendingBreakpoint2 接口的简单CPendingBreakpoint对象实现此方法。
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;
}