Question

我有这样的功能

void UnitTestWorker::constructTestPayload(QByteArray &payload)
{
    QString List = "127.0.0.1";
    unsigned short Port = 12344;
    unsigned int RequestId = 1;
    memcpy(payload.data(),reinterpret_cast<char*>Port,sizeof(Port));
    memcpy(payload.data()+sizeof(Port),reinterpret_cast<char*>RequestId ,sizeof(RequestId ));
}

但我收到访问权限违规错误，似乎我无法执行reinterpret_cast<char*>Port或reinterpret_cast<char*>RequestId之类的操作。

Answer 1

您必须确保QByteArray &payload的大小足以接收您将其复制到其中的数据：

if (payload.size()<sizeof(Port)+sizeof(RequestId)) 
    throw exception ("Ouch !! payload too small"); 
memcpy(payload.data(),reinterpret_cast<char*>(&Port),sizeof(Port));
memcpy(payload.data()+sizeof(Port),reinterpret_cast<char*>(&RequestId) ,sizeof(RequestId ));

将unsigned short / int转换为char *

1 个答案: