IDebugProperty3::GetStringChars

项目
11/04/2016

Applies to: Visual Studio Visual Studio for Mac

Note

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Retrieves the string associated with this property and stores it in a user-supplied buffer.

Syntax

HRESULT GetStringChars(
    ULONG  buflen,
    WCHAR* rgString,
    ULONG* pceltFetched
);

int GetStringChars(
    uint       buflen,
    out string rgString,
    out uint   pceltFetched
);

Parameters

buflen
[in] Maximum number of characters the user-supplied buffer can hold.

rgString
[out] Returns the string.

[C++ only], rgString is a pointer to a buffer that receives the Unicode characters of the string. This buffer must be at least buflen characters (not bytes) in size.

pceltFetched
[out] Where the number of characters actually stored in the buffer is returned. (Can be NULL in C++.)

Return Value

If successful, returns S_OK; otherwise returns an error code.

Remarks

In C++, care must be taken to insure that the buffer is at least buflen Unicode characters long. Note that a Unicode character is 2 bytes long.

Note

In C++, the returned string does not include a terminating null character. If given, pceltFetched will specify the number of characters in the string.

Example

CStringW RetrievePropertyString(IDebugProperty2 *pPropInfo)
{
    CStringW returnString = L"";
    CComQIPtr<IDebugProperty3> pProp3 = pPropInfo->pProperty;
    If (pProp3 != NULL) {
        ULONG dwStrLen = 0;
        HRESULT hr;
        hr = pProp3->GetStringCharLength(&dwStrLen);
        if (SUCCEEDED(hr) && dwStrLen > 0) {
            ULONG dwRead;
            CStrBufW buf(returnString,dwStrLen,CStrBuf::SET_LENGTH);
            hr = pProp3->GetStringChars(dwStrLen,
                                        reinterpret_cast<WCHAR*>(static_cast<CStringW::PXSTR>(buf)),
                                        &dwRead);
        }
    }
    return(returnString);
}

通过