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git-svn-id: svn://ultimatepp.org/upp/trunk@11484 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2017-11-19 22:49:57 +00:00
parent 143b86293f
commit b548c767e7
1 changed files with 17 additions and 0 deletions
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17
tutorial/CoreTutorial/Stream.cpp
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@ -4,11 +4,17 @@ void Stream()
{
/// .Streams basics
/// U++ stream working with files is `FileStream`. It has 3 derived classes, `FileIn`,
/// `FileOut` and `FileAppend`, for the most common uses.
FileIn in(GetDataFile("test.txt"));
if(!in) {
LOG("Failed to open the file");
return;
}
/// The most basic operations of streams are Put and Get. Get works in the same ways as
/// good old C getc - it returns negative number on eof or error:
String h;
int c;
@ -16,13 +22,24 @@ void Stream()
h.Cat(c);
DUMP(h);
/// U++ streams provide no formatting capabilities (that is deferred to text utilities),
/// but they have some unique features. U++ does not distinguish between 'text' and
/// 'binary' mode streams, methods are well suited to work with both in common mode.
/// GetLine returns String of single line read (lines separators being '\n', '\r' are
/// ignored):
in.Seek(0);
while(!in.IsEof())
DUMP(in.GetLine());
/// Get method reads at most specified number of bytes from the stream and returns them as
/// String:
in.Seek(0);
DUMP(in.Get(10));
in.Seek(0);
DUMP(in.Get(999999).GetCount());