Example: Change the current position
public static int main (string[] args) {
// open file:
FileStream stream = FileStream.open ("test.txt", "w+");
assert (stream != null);
// write data:
// file content: "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
for (char c = 'A'; c <= 'Z' ; c++) {
stream.putc (c);
}
stream.flush ();
// get the 1. char:
// file content: "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// file ptr: ^
int tmp = stream.seek (0, FileSeek.SET);
assert (tmp >= 0);
int c = stream.getc ();
assert (c >= 0);
print ("First char: %c\n", c);
// Get the next but one char:
// file content: "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// file ptr: ^
stream.ungetc (c); // revert .getc
tmp = stream.seek (2, FileSeek.CUR);
assert (c >= 0);
c = stream.getc ();
assert (c >= 0);
print ("Third char: %c\n", c);
// Get the last char:
// file content: "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// file ptr: ^
stream.ungetc (c); // revert .getc
tmp = stream.seek (-1, FileSeek.END);
assert (c >= 0);
c = stream.getc ();
assert (c >= 0);
print ("Last char: %c\n", c);
return 0;
}
valac --pkg glib-2.0 GLib.FileStream.seek.vala
See:
