C ++ / QT Qstring中的类型转换 [英] type conversion in C++/QT Qstring

问题描述

嗨程序员！

我从DLL文件中获取数据时有一个问题。

Hi programmers!
I have one issue while i am fetching data from DLL file.

if (PCANReadS == PCAN_ERROR_OK)
{
    Dataid = QString::number(msg.ID, 16);
    nt temp =* (int*)msg.DATA;
    MsgType = msg.MSGTYPE;
    //MsgDLC = msg.LEN;
    MsgDLC = QString::number(msg.LEN, 10);
    Datain = QString::number(temp, 16);
    TStmpMilliCurrent = QString::number(timestamp.millis, 10);
    TStmpMicroCurrent = QString::number(timestamp.micros, 10);
}

我想要做的是获得当前时间戳和之前时间戳之间的差异。

当我减去它时会给我错误，因为两者都是Qstring。

如何在两个时间戳之间得到这个差异？

What i want to do is getting the difference between current time stamp and previous.
When i subtract it gives me error because both are in Qstring.
How i can get this difference between two time stamps?

推荐答案

一个关于如何根据可用代码存储时间戳的不完整示例：

An incomplete example on how to store a timestamp based on the available code:

int prevTime = 0;

void someFunction()
{
    if (PCANReadS == PCAN_ERROR_OK)
    {
        int diffTime = 0;
        // If not first frame
        if (prevTime)
            difftime = timestamp.millis - prevTime;
        prevTime = timestamp.millis;
    }
}

最好使用与 timestamp 相同的类型全局变量。但我不知道这种类型。

It would be better to use the same type as timestamp for the global variable. But I did not know the type.

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