It is necessary to open the channel, allocate a buffer, read data, close the channel. The usual approach based on ftell, fseek with the channel does not work: the functions return an error.
How to find out the amount of data that is in the pipe (pipe)?
In general, the only reliable portable way to find out how much data is in a channel is to read this data from the channel.
You can read in parts, in a pre-selected small buffer. How much will actually be read, so much and there is data in the channel. If the memory is not enough, then allocate by necessity.
Source: https://ru.stackoverflow.com/questions/11520/
All Articles