Grrr ... C ++文件I / O.

" SpreadTooThin"写道：

"SpreadTooThin" writes:

该死的... FILE * fp比C ++文件i / o容易得多......

我只是没有得到它......真的！


filebuf，istream，ostream，ifstream，ofstream，iosteam ...

什么是f&（）{（我用二进制文件进行i / o读写。

我需要能够读写，寻找和告诉

我使用哪个课程?????

Damn.. FILE *fp was just sooo much easier than C++ file i/o...
I just don''t get it.. really!

filebuf, istream, ostream, ifstream, ofstream, iosteam...
what the f&(){( do I use to do binary file i/o read and write.
I need to be able to read and write, seek and tell
which class do I use?????

使用ios :: binary作为打开文件的参数。

使用ifstr eam，tellg，seekg和read to read。

使用ofstream，tellp，seekp和write来写。


明智地用std ::盐游泳。

Use ios::binary as a parameter the file open.
Use ifstream, tellg, seekg and read to read.
Use ofstream, tellp, seekp, and write to write.

Salt judiciously with std:: until your head swims.

SpreadTooThin< bj ******** @ gmail.comwrites：

SpreadTooThin <bj********@gmail.comwrites:

>该死的.. FILE * fp比C ++文件i / o简单得多......
我只是没有得到它......真的！

>Damn.. FILE *fp was just sooo much easier than C++ file i/o...
I just don''t get it.. really!

http://www-h.eng.cam.ac.uk/help/tpl/...es/C++/io.html

*可能*帮助。

http://www-h.eng.cam.ac.uk/help/tpl/...es/C++/io.html
*might* help.

简单例子


#include< fstream>

#include< iostream>

#include< string>

#include< iomanip>

using namespace std;


int main（int ArgC，char * ArgV []）

{

// ----- -----------输入示例

// bin只是为了确保它在ms-windows和unix风格上的工作方式相同

（unix' 'es总是bin）

ifstream输入（" Filename.dat"，ios_base :: binary）;

if（！Input.is_open（））

{

cerr<< __LINE__<< 看到错误 &LT;&LT; endl;

throw" Error";

}

string Line;

while（getline（输入，线））

{

cout<< 读< &LT;&LT;线<< &QUOT;&GT;&QUOT; &LT;&LT; endl;

}


// -------------------输出示例

ofstream输出（" Filenameout.dat"，ios_base :: binary）;

if（！Output.is_open（））

{

cerr<< __LINE__<< 看到错误 &LT;&LT; endl;

throw"错误&quot ;;

}

//右边的右对齐空格右边填充为字符串

long Number = 10;

//以下写入文本

输出<< setiosflags（ios_base :: left）<< resetiosflags（

ios_base :: right）<< setw（20）<< setfill（'''）<<数字<< endl;


//这将在大多数32位机器上写4个字节

//长时间写任意数据

Output.write（reinterpret_cast< char *>（& Number），sizeof（Number））; //

对面是Input.read

}


问候，Ron AF Greve

http://www.InformationSuperHighway.eu


&QUOT; SpreadTooThin&QUOT; < bj ******** @ gmail.com写信息

新闻：11 ********************** @ i13g2000prf.googlegr oups.com ...

Hi,

Simple example

#include <fstream>
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main( int ArgC, char *ArgV[] )
{
//----------------Input example
// bin just to make sure it works the same on ms-windows and unix flavors
(unix''es are always bin)
ifstream Input( "Filename.dat", ios_base::binary );
if( !Input.is_open() )
{
cerr << __LINE__ << "see an error" << endl;
throw "Error";
}
string Line;
while( getline( Input, Line ) )
{
cout << "Read <" << Line << ">" << endl;
}

//-------------------Output example
ofstream Output( "Filenameout.dat", ios_base::binary );
if( !Output.is_open() )
{
cerr << __LINE__ << "see an error" << endl;
throw "Error";
}
// Right left alligned space right padded long as string
long Number = 10;
// The following writes text
Output << setiosflags( ios_base::left ) << resetiosflags(
ios_base::right ) << setw( 20 ) << setfill( '' '' ) << Number << endl;

// This wil write 4 bytes on most 32 bit machines
// Write arbitrary data for instance long
Output.write( reinterpret_cast<char*>( &Number ), sizeof( Number ) ); //
Opposite is Input.read
}

Regards, Ron AF Greve

http://www.InformationSuperHighway.eu

"SpreadTooThin" <bj********@gmail.comwrote in message
news:11**********************@i13g2000prf.googlegr oups.com...

该死的..文件* fp比C ++文件i / o简单得多......

我只是没有得到它......真的！


filebuf，istream，ostream，ifstream，ofstream，iosteam ...

什么f&（）{（我用来做二进制文件i / o读写。

我需要能够读写，寻找和告诉

我使用哪个班级?????


感到沮丧..

Damn.. FILE *fp was just sooo much easier than C++ file i/o...
I just don''t get it.. really!

filebuf, istream, ostream, ifstream, ofstream, iosteam...
what the f&(){( do I use to do binary file i/o read and write.
I need to be able to read and write, seek and tell
which class do I use?????

frustrated..