C ++读缓冲区大小 [英] C++ reading buffer size

问题描述

假设此文件为2和1/2块长，块大小为1024。

Suppose that this file is 2 and 1/2 blocks long, with block size of 1024.

aBlock = 1024;
char* buffer = new char[aBlock];
while (!myFile.eof()) {
    myFile.read(buffer,aBlock);
    //do more stuff
}

第三次读取将写入一半的缓冲区，另一半有无效数据。有没有办法知道它实际写入缓冲区有多少字节？

The third time it reads, it is going to write half of the buffer, leaving the other half with invalid data. Is there a way to know how many bytes did it actually write to the buffer?

推荐答案

istream :: gcount 返回上一次读取的字节数。

istream::gcount returns the number of bytes read by the previous read.

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