在ADTF开发中使用MDF4文件进行数据流分析时,可能会遇到“Unable to resolve substream”错误。这是由于在访问MDF4文件中的数据流时缺少元数据信息导致的。该错误可以通过添加元数据信息来解决。
以下是一个示例代码片段,演示了如何添加元数据信息和解决“Unable to resolve substream”错误:
tResult PrepareStream(eMode eModeSub, const std::string& strStreamName)
{
// Get the stream from the configuration
object_ptr pStreamType;
RETURN_IF_FAILED(GetSignalType(strStreamName.c_str(), &pStreamType));
object_ptr pStreamTypeDyn;
RETURN_IF_FAILED(pStreamType->GetDynamicInterface(iid, reinterpret_cast(&pStreamTypeDyn)));
// Retrieve the meta data
object_ptr pStreamDescription;
RETURN_IF_FAILED(CreateStreamDescription(strStreamName, pStreamType, pStreamDescription));
object_ptr pStreamOptions;
if (IS_OK(pStreamDescription->GetElement(OPTIONS_NAME, &pStreamOptions)))
{
object_ptr pStreamOptionsItf;
RETURN_IF_FAILED(pStreamOptions->QueryInterface(IID_IStreamOptions, reinterpret_cast(&pStreamOptionsItf)));
tInt32 iSegmentSize = 0;
RETURN_IF_FAILED(pStreamOptionsItf->GetProperty("InSegmentSize", &iSegmentSize));
// Add the meta data
object_ptr pStreamTypeOut;
RETURN_IF_FAILED(CreateStreamType(this, "tType", "tTypeImport", pStreamType->GetDescription()));
RETURN_IF_FAILED(pStreamTypeOut->GetDynamicInterface(iid, reinterpret_cast(&pStreamTypeDyn)));
object_ptr pStreamOptionsOut;
RETURN_IF_FAILED(CreateStreamOptions(this, "tOptions", "tOptionsImport", pStreamOptions));
pStreamOptionsOut = make_object_ptr();
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