Earning for reading SMS
(250 Views)
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while(!FP.eof()) is reading the last data point of the file twice
(242 Views)
I'm wondering if someone could point me to the flaw in the following
code that uses the while(!FP.eof()) condition to read the input data.
This condition is reading the last data point of the file twice.
#include
#include
using namespace std;
int main(int argc, char **argv)
{
double x;
ifstream FP("test.d");
//while(!FP.eof()){FP >> x; cout x){cout
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Problem reading a bin file
(252 Views)
I came from delphi world and now I'm doing my first steps in C++. I'm
using C++builder because its ide is like delphi although I'm trying to
avoid the vcl.
I need to insert new features to an old program that I wrote in delphi
and it's a good opportunity to start with c++.
well, the problem is:
I need to read a binary file according to some structure, all
variables of its structure are of type "char" of different sizes.
The reading is made ok, but the value that I got of ManVer is his
value concatenated with Pieces and Weight and WeightUnit, the value of
Pieces is his value and also concatenated with Weight and WeightUnit.
This happens with the rest of variables until the last of them, that
only has his value.
Only when I see the structure with Evaluate/Modify (Ctrl +F7 on
windows) the result is the one that I expect to get
I hope that you can help me...
here's the code:
--------------
ifstream _fileStream;
TStructure_V250_Data _buffer250;
//open the file...
char* _fName = new char[_fileName.Length() +1];
strcpy(_fName, _fileName.c_str());
_fileStream.open(_fName, ios::binary);
delete [] _fName;
//read data...
_fileStream.read((char*)&_buffer250, sizeof(_buffer250));
---------------------------
_buffer250 structure is too long, i only show you a piece
---------------------------
typedef struct _Structure_V250_Data
{
char ManVer[4];
char Pieces[3];
char Weight[5];
char WeightUnit[2];
//...
//...
//...
} TStructure_V250_Data;
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Strange problem reading unsigned chars from an ifstream
(312 Views)
Hi ,
Sorry if I'm just being daft, but I can't immediately see why the following
code won't work. It's supposd to read in the characters from blah.raw one by
one, then output the textual representation of them to blah.txt, with spaces
between each. The end result is almost right, but it arbitrarily misses out
a couple of values. Please could you tell me if I'm doing something
obviously wrong (Or...failing that, might I have a minor bug in my library
implementation I'm assuming it's my own fault for the moment, but it has
crossed my mind...)
Cheers,
Stu
(I'm trying to do this as a quick(!) way of getting a heightmap into MATLAB
to render a surface rather than writing a heightmap viewer in OpenGL, for
what it's worth, and it's missing one pixel value each on the first and last
lines.)
#include
int main()
{
std::ifstream ifs("blah.raw", std::ios::binary);
std:fstream ofs("blah.txt");
unsigned char c;
while(ifs >> c)
{
ofs
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reading variables from a stream(beginner)
(281 Views)
hello, what i am trying to do is set up a loop that grabs multiple
variables from an input file. my question is, is there a built in
function in the istream class that can grab multiple values on one
line.
such as
60 40 10 10
all getting put into different variables. the problem i am having is
that there is other data in the file that i do not want to do this to.
can i set the get for only the first line of data from the file.
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File reading problem
(260 Views)
Hi! I have a program with a class that needs to be able to write
itself to a file in clear text format. The file has two integers and
vector of struct objects. The struct has a string that can consist of
one or more words and a few integers. I'm able to create the file
properly, as confimed by viewing it in a text editor, but something
goes wrong when I tried to read it. I've made a test program
illustrating the problem:
#include
#include
#include
#include
using namespace std;
struct s_t
{
s_t() {}
s_t(const string& si, int xi, int yi) : s(si), x(xi), y(yi) {}
string s;
int x, y;
friend ostream& operator(istream& is, s_t& rhs);
};
ostream&
operator> x >> y;
{
s_t temp;
while (in >> temp) vec.push_back(temp);
}
in.close();
cout
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Problems with file reading and writing
(277 Views)
,
I've encountered a strange problem which I can't seem to explain.
I've written a simple C++ class that deals with a certian binary file.
In one of the methods there, I wish to update a file - namely to read
a certain field whose offset I know, and then write to another field,
whose offset I also know.
In order to read the data, I first use file.seekg(offset, ios::beg),
and then a read command; I've checked the variable, and this part is
executed as it should be. The problem is with the writing.
To place the head where I want it, I use a file.seekp(offset,
ios::beg) statement. After this statement, regardless of what the
value of 'offset' is, file.tellp() always returns '-1'.
The file was opened using the statement:
file.open(FileName.c_str(), ios::in | ios:ut | ios::binary)
where FileName is a string. The reading goes smoothly and returns the
correct values, so I doubt there's a problem with the actual opening
of the file.
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Re: reading a string at the end of a line
(241 Views)
Thank you, all of you have been very very helpful in this and i am very
apprciated.. Now i have what i need, but it seems the program will not
rename the extension and refuses to.
heres the code I have:
#include
#include
#include
using namespace std;
int main(){
ifstream fin;
string fname,fdefault="BmpData.txt";
cout
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reading in comma delimited file into array
(281 Views)
hi-
I want to read in a text file that is comma delimited with floating
point values. I'm confused whether ifstream or fopen is the correct
format to use for this. if I use ifstream, how to I read in one line
at a time into the array also is there a way to get the total number
of lines in the text file so I know how big to set the array
the text file looks like
1.555,2.555
1.948,33.44
etc, and I just want to put the values in an array with two columns.
it sounds pretty simple but I haven't been able to figure out how to
do it yet.
so far the code is
ifstream input("data_record.txt")
if (input.fail()){
cout
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Implementing the NeXus(format) reading Library NCL
(300 Views)
I am trying to add the ability to read the NeXus file format to my program,
I found a library called NCL which does this. My problem is that all my
experience is in in Delphi so my C++ is ...
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Simple multi-threading
(226 Views)
Currently I have a single threaded server, developed using C, serving
multiple client at the same time, now I want a new feature:
a. I need to execute a particular program at some point, e.g.
email.exe
b. the email.exe might ...
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Problem reading wstring from a wstream
(237 Views)
Compare these two programs:
int main() {
const wchar_t str[] = { 0xFEFF, 0x2EE4, 0x0000 };
wstringstream ss( str );
wstring line;
getline( ss, line );
assert( line.size() == 2 );
assert( line[0] == 0xFFFE );
assert( line[1] == 0xE42E ...
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reading string from char array
(222 Views)
I have a programs that reads char ouput and should send a signal when
it reads "login". I am currently reading into a char array but how do
I check for the match I don't think I can do-
...
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multithreading.
(197 Views)
hello evreyone ,
when i last posted to ask you people to suggest me where to begin from
for multithreading in c++
a lot many good people suggested me to begin with a good book .
the only one of ...
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bazillion stepstones with multithreading...
(257 Views)
<- about to have a major crisis here.
I wanted is to create a little tool with a GUI. Now I see problems
related to thread programming arising everywhere. If I use the GUI to
set a flag as ...
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