IDebugProperty3::GetStringCharLength
Note
This article applies to Visual Studio 2015. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Returns the number of characters in the associated property's string.
Syntax
HRESULT GetStringCharLength(
ULONG *pLen
);
int GetStringCharLength(
out uint pLen
);
Parameters
| Parameter | Description |
|---|---|
pLen |
[out] Returns the number of characters in the property's string. |
Return Value
If successful, returns S_OK; otherwise returns error code.
Remarks
Typically, this method is used as a prelude to allocating a buffer for a call to the GetStringChars method.
Example
The following example shows how to implement this method for a CProperty object that exposes the IDebugProperty3 interface.
STDMETHODIMP CProperty::GetStringCharLength(ULONG *pLen)
{
HRESULT hr = E_INVALIDARG;
EVALFLAGS oldEVALFLAGS = m_EVALFLAGS;
m_EVALFLAGS &= ~EVAL_NOFUNCEVAL;
if (pLen)
{
DEBUG_PROPERTY_INFO dpInfo;
dpInfo.bstrValue = NULL;
ULONG ulen = 0;
hr = GetPropertyInfo(DEBUGPROP_INFO_VALUE,10,DEFAULT_TIMEOUT,NULL,0,&dpInfo);
if (hr == S_OK && dpInfo.bstrValue)
{
if (wcscmp(dpInfo.bstrValue,L"Nothing") == 0)
{
ulen = 0; //VSWhidbey#64815
}
else
{
ulen = ::SysStringLen(dpInfo.bstrValue);
if( ulen > 2 &&
dpInfo.bstrValue[0] == L'"' &&
dpInfo.bstrValue[ulen-1] == L'"')
{
ulen = ulen > 2 ? ulen - 2 : ulen; //remove two double quotes
}
}
}
::SysFreeString(dpInfo.bstrValue);
*pLen = ulen;
}
m_EVALFLAGS = oldEVALFLAGS;
return hr;
}