Output stream class to operate on strings.
Questions tagged [ostringstream]
150 questions
6
votes
3 answers
Why does ostringstream strip NULL?
I have a string whose last part(suffix) needs to be changed several times and I need to generate new strings. I am trying to use ostringstream to do this as I think, using streams will be faster than string concatenations. But when the previous…
balki
- 26,394
- 30
- 105
- 151
6
votes
2 answers
Convert array of uint8_t to string in C++
I have an array of type uint8_t. I want to create a string that concatenates each element of the array. Here is my attempt using an ostringstream, but the string seems to be empty afterward.
std::string key = "";
std::ostringstream convert;
for (int…
Alex Parker
- 1,533
- 3
- 16
- 38
6
votes
2 answers
Is it possible to change ostringstream rdbuf?
I try the following code:
ostringstream oss;
streambuf *psbuf, *backup;
backup = oss.rdbuf();
psbuf = cout.rdbuf();
oss.rdbuf(psbuf);
oss << things << endl;
oss.rdbuf(backup);
But unfortunately I get this error:
error: too…
user3391320
- 1,023
- 7
- 9
6
votes
1 answer
std::ostringstream isn't returning a valid string
I'm trying to use std::ostringstream to convert a number into a string (char *), but it doesn't seem to be working. Here's the code I have:
#include
#include
int main()
{
std::ostringstream out;
out << 1234;
const…
AutoBotAM
- 1,485
- 3
- 18
- 24
5
votes
3 answers
How to write a `<<` operator for boost::tuple?
In the sample code below, it shows that boost::tuple can be created implicitly from the first template argument.
Because of that I am not able to write a << operator as it becomes ambiguous.
Also I don't understand why ostringstream& << float is…
balki
- 26,394
- 30
- 105
- 151
5
votes
2 answers
CRLF end of line and ostringstream
I am trying to use a ostringstream to build a string which uses the platform standard line endings (so for me it is CRLF since I am developing for Windows). I tried the following code:
std::ostringstream out;
out << "line1\nline2\n";
const char*…
JMD
- 218
- 1
- 2
- 6
5
votes
1 answer
C++ std::stringstream/ostringstream and UTF characters
I'm writing a program which processes some data, outputs it to a .csv file, then writes a GNUplot script, and calls GNUplot to execute the script and create an image file all with the same name (only different extensions). The filenames contain UTF…
pavichokche
- 91
- 1
- 8
5
votes
1 answer
Reading binary data in memory into a stringstream and stream this over a socket
I would like to know if it is possible to, for instance, take a piece of data in memory, read it into an output stringstream (as binary data) and write this onto a socket for a client application to process.
The problem I run into while attempting…
Jan Swart
- 6,761
- 10
- 36
- 45
4
votes
1 answer
C++ Int to String by using ostringstream or stringstream
I've been using stringstream to convert Integer to String, but then I realized same operation can be done with ostringstream.
When I use .str() what is the difference between them? Also, is there more efficient way to convert integers to…
Malkavian
- 372
- 1
- 5
- 16
4
votes
3 answers
How would std::ostringstream convert to bool?
I stumbled across this code.
std::ostringstream str;
/// (some usage)
assert( ! str );
What does ostringstream signify when used in a bool context?
Is this possibly an incorrect usage that happens to compile and run?
Drew Dormann
- 59,987
- 13
- 123
- 180
4
votes
2 answers
Odd behavior with ostringstream
I was trying to think of a clever way to concatenate various things into a single string argument for a function without having to use an ostringstream explicitly. I thought of:
#define OSS(...) \
dynamic_cast
Paul J. Lucas
- 6,895
- 6
- 44
- 88
4
votes
3 answers
How to use an ostringstream in just an expression
I use std::ostringstream for formatting strings, which inherits its << operators from ostream, and consequently they return an ostream and not an ostringstream, which means that I can't call ostringstream::str on the result. This usually isn't a…
Anonymous
- 491
- 2
- 12
4
votes
2 answers
How to stream float .1 as .1 and not 0.1
std::ostringstream oss;
oss << std::setw(10);
oss << std::setfill(' ');
oss << std::setprecision(3);
float value = .1;
oss << value
I can check if value < 1 and then find the leading zero and remove it. Not very elegant.
John
- 541
- 4
- 13
4
votes
5 answers
How to convert a char array into string based hex-stream (ostringstream)
in C++ (on Linux with gcc) I'd like to put a byte array (vector) to a ostringstream or a string.
I know that I can use sprintf but it doesn't seem to be the best way to use char* also.
btw: this link did not help
Edit: All answer work…
tuergeist
- 9,171
- 3
- 37
- 58
4
votes
4 answers
C++ ostringstream strange behavior
I had a very strange problem with c++ code recently.
I have reproduced the case in minimalist example.
We have an Egg class:
class Egg
{
private:
const char* name;
public:
Egg() {};
Egg(const char* name) {
this->name=name;
}
…
Borislav Stoilov
- 3,247
- 2
- 21
- 46