Defined in header <cstdio> | ||
|---|---|---|
void rewind( std::FILE* stream ); |
Moves the file position indicator to the beginning of the given file stream.
The function is equivalent to std::fseek(stream, 0, SEEK_SET);, except that end-of-file and error indicators are cleared.
The function drops any effects from previous calls to ungetc.
| stream | - | file stream to modify |
(none).
#include <array>
#include <cstdio>
int main()
{
std::FILE* f = std::fopen("file.txt", "w");
for (char ch = '0'; ch <= '9'; ch++)
std::fputc(ch, f);
std::fclose(f);
std::array<char, 20> str;
std::FILE* f2 = std::fopen("file.txt", "r");
const unsigned size1 = std::fread(str.data(), 1, str.size(), f2);
std::puts(str.data());
std::printf("size1 = %u\n", size1);
std::rewind(f2);
const unsigned size2 = std::fread(str.data(), 1, str.size(), f2);
std::puts(str.data());
std::printf("size2 = %u", size2);
std::fclose(f2);
}Output:
0123456789 size1 = 10 0123456789 size2 = 10
| moves the file position indicator to a specific location in a file (function) |
|
C documentation for rewind |
|
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