error: ‘class nvinfer1::IRuntime’ has no member named ‘getLastError’ 32 | std::cerr << "Error: " << runtime->getLastError() << std::endl;

对不起，我之前的回答有误。`nvinfer1::IRuntime`确实没有`getLastError()`函数。如果您想要获取错误信息，可以使用`nvinfer1::IHostMemory`对象来捕获反序列化引擎的错误信息。以下是一个修改后的示例代码片段：

int main()
{
    // Create the inference runtime
    nvinfer1::IRuntime* runtime = nvinfer1::createInferRuntime(...);

    // Deserialize the CUDA engine
    std::ifstream engineFile("engine.plan", std::ios::binary);
    engineFile.seekg(0, std::ios::end);
    const size_t fileSize = engineFile.tellg();
    engineFile.seekg(0, std::ios::beg);
    std::vector<char> engineData(fileSize);
    engineFile.read(engineData.data(), fileSize);
    nvinfer1::IHostMemory* engineMemory = runtime->deserializeCudaEngine(engineData.data(), fileSize);

    // Check if deserialization was successful
    if (engineMemory == nullptr)
    {
        std::cerr << "Error: Failed to deserialize CUDA engine" << std::endl;
        return 1;
    }

    // Check if there were any errors during deserialization
    if (engineMemory->size() == 0)
    {
        std::cerr << "Error: " << std::string(static_cast<char*>(engineMemory->data()), engineMemory->size()) << std::endl;
        return 1;
    }

    // Deserialize the engine from the host memory
    nvinfer1::ICudaEngine* engine = runtime->deserializeCudaEngine(engineMemory->data(), engineMemory->size(), nullptr);

    // ...
}

在上述示例中，`deserializeCudaEngine()`函数返回一个`nvinfer1::IHostMemory`对象，该对象包含了反序列化引擎的状态。如果返回的`IHostMemory`对象的大小为0，则说明发生了错误。此时，您可以使用`std::string(static_cast<char*>(engineMemory->data()), engineMemory->size())`来获取错误消息。