In C++ std::istream is the base class for input streams.
Questions tagged [istream]
696 questions
4
votes
1 answer
copying from a std::istreambuf_iterator<> to a std::vector<>
I have a Visual Studio 2008 C++ application where I would like to treat a stream as a set of iterators.
For example, if I were to receive an array of WIN32_FIND_DATA structures over the stream, I would like to be able to do something like…
PaulH
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votes
2 answers
How to create C++ istringstream from a char array with null(0) characters?
I have a char array which contains null characters at random locations. I tried to create an iStringStream using this array (encodedData_arr) as below,
I use this iStringStream to insert binary data(imagedata of Iplimage) to a MySQL database blob…
Morpheus
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4
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1 answer
How could I redirect stdin (istream) in wxWidgets?
I'm trying to figure out how to redirect istream to wxwidgets.
I was able to accomplish redirecting ostream, here's how (so you know what I mean):
wxTextCtrl* stdoutctrl = new wxTextCtrl(...);
wxStreamToTextRedirector redirect(stdoutctrl);…
Anthony
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4
votes
1 answer
Windows IStream interface on std::istream
Within C++ on Windows, is there any easy way to create a (COM) IStream interface to an existing std::stream object?
An example would be to read an image with IWICStream::InitializeFromIStream() from std::cin.
Hugues
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4
votes
1 answer
Why is failbit() set?
Create a file and fill it up with zeroes:
dd if=/dev/zero of=/tmp/zeroes count=1
Write this little program to extract the first unsigned integer it encounters in the file.
#include
#include
int main()
{
std::ifstream…
qdii
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4
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3 answers
Is it possible to use insertion operator on two objects at same time?
For example if i want to use extraction operator on two object to send the same data tto two object for syntax shortcut
(out_file, cout) << "\n\nTotal tokens found: " << statistics[0] << "\n\nAlphaNumeric Tokens: " << statistics[1]
…
Kelvin
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4
votes
1 answer
C++ istream tellg()/fail() on eof: behavior change; work-around?
I upgraded my compiler from gcc-4.4 to gcc-4.8 and one project fails miserably stemming from the following (false) assumptions:
#include
#include
int main()
{
using namespace std;
istringstream iScan;
int num;
…
JimB
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4
votes
1 answer
Can I read in binary data with istream in c++?
Right now I am using istream to read in data. I have both text which I would like to read in as strings and numbers, and hashes which are read into character arrays. Since hashes are effectively random, I am hitting snags when I try to read it…
Eric Kulcyk
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4
votes
2 answers
Passing istream into a function
I am making a game-type program similar to the idea of pokemon. We have a tournament class that keeps track of several teams(its own class) which consists of pets(its own class) with different kinds of pets being subclasses of CPet.
We are…
Nagilum
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3
votes
2 answers
Error while Overloading the '>>' operator
I'm designing a Money object for a project. I'm not asking for help on implementation, because I really have to figure that out myself, but I'm getting the following error (and this is the only error!)
error C2678: binary '>>' : no operator found…
Tasuret
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3
votes
1 answer
C++: strange behavior with std::istream or sentry wrap around
This small custom getline function was given as an answer to a question about handling different line endings.
The function worked great until it was edited 2 days ago to make it not skip leading white spaces for each line. However, after the…
Tech_Guy
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3
votes
2 answers
eof of istream in C++
bool ios::eof ( ) const;
According to the library,
The function returns true if the eofbit stream's error flag has been
set by a previous i/o operation. This flag is set by all standard
input operations when the End Of File is reached in the…
Alcott
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3
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Creating icon stream from resource file?
Win32 MFC
I can load an icon stream (to use with WebView2) from a physical ICO file on my hard drive. Eg:
wil::com_ptr iconStreamPdfSettings;
CHECK_FAILURE(SHCreateStreamOnFileEx(
L"d:\\Icons\\settings.ico", STGM_READ,…
Andrew Truckle
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3
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1 answer
Reading text fields from file with custom separator
I am working on a problem for a class I'm taking in which we need to read in text from a file to a 2d table of strings (called 'string table[][]'). The text file I'm reading in is formatted as follows:
Ain el Beida # - # - # OEB # Algeria # Africa…
Paul Woidke
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3
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3 answers
stringstream operator>> fails to assign a number in debug
I have this simple function that, given a string str, if it is a number then return 'true' and overwrite the reference input num.
template
bool toNumber(string str, T& num)
{
bool bRet = false;
if(str.length() > 0U)
{
…
GiaMat45
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