IDebugBreakpointChecksumRequest2::GetChecksum

根据要使用的检查和算法的唯一标识符，检索断点请求的文档检查和。

语法

C#

public int GetChecksum(
    ref Guid               guidAlgorithm,
    out enum_CHECKSUM_DATA pChecksumData
);

C++

HRESULT GetChecksum(
    REFGUID        guidAlgorithm,
    CHECKSUM_DATA *pChecksumData
);

参数

guidAlgorithm
[in]检查和算法的唯一标识符。

pChecksumData
[out]断点请求的文档检查和。

返回值

如果成功，则返回 S_OK；否则，返回错误代码。

示例

下面的示例演示一个函数，该函数检查文档的检查和是否与 UI 中的文档的检查和匹配。

bool CDebugProgram::DoChecksumsMatch(CDebugPendingBreakpoint *pPending, CDebugCodeContext *pContext)
{
    bool fRet = false;
    HRESULT hRes;

    // Get the checksum for the document we are about to bind to from the pdb side
    GUID guidAlgorithmId;
    BYTE *pChecksum = NULL;
    ULONG cNumBytes = 0;

    hRes = pContext->GetDocumentChecksumAndAlgorithmId(&guidAlgorithmId, &pChecksum, &cNumBytes);

    if ( S_OK == hRes )
    {
        // Get checksum data for the document from the UI (request) side
        CComPtr<IDebugBreakpointChecksumRequest2> pChecksumRequest;

        hRes = pPending->GetChecksumRequest(&pChecksumRequest);

        if ( S_OK == hRes )
        {
            CHECKSUM_DATA data;

            hRes = pChecksumRequest->GetChecksum(guidAlgorithmId, &data);

            if ( S_OK == hRes )
            {
                if ( data.ByteCount == cNumBytes && memcmp(data.pBytes, pChecksum, cNumBytes) == 0 )
                    fRet = true;
                else
                    fRet = false;

                // Free up data allocated for checksum data
                CoTaskMemFree(data.pBytes);
            }
            else
                fRet = true; // checksums not available - user disabed checksums
        }
        else
            fRet = true; // we couldn't get checksum from UI - default to past behavior

        // free up space allocated for checksum from pdb
        CoTaskMemFree(pChecksum);
    }
    else
        fRet = true; // we don't have a checksum to compare with.

    return ( fRet );
}

另请参阅

• IDebugBreakpointChecksumRequest2