使用C++讀寫檔案

使用(C++庫)fstream讀寫檔案

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//awzzz@2002//入門計劃->使用(C++庫)fstream讀寫檔案//APO->using fstream.//accidence project of using fstream.(c++ iostream library)/*  Reference: http://www.cplusplus.com/ref/iostream/fstream/  Description  fstream class provides a stream interface to read and write data from/to files.  The class mantains internally (privately) a pointer to a filebuf object in charge  of the interaction with the file. This pointer can be obtained/modified by calling  member rdbuf.  The file to be processed can be specified as a parameter for the constructor or by  calling member open.  After a file is processed it can be closed by calling member close. In this case  the file stream may be used to open another file.  Member is_open can be used to determine wether the stream is currently operating  on a file or not.  Please refer to parent classes for more details on information mantained by an  fstream object. *///使用(C++庫)fstream讀寫檔案//simple example#include <iostream>#include <fstream>using namespace std;#ifdef WIN32#define TEST_FILE   "c://tmp//test.txt"#else#define TEST_FILE   "/tmp/test.txt"#endifvoid test(){    {        //fstream sfs;        //sfs.open(TEST_FILE, ios_base::out);        fstream sfs(TEST_FILE, ios_base::out);                char buf[] = "1234567890";        sfs.write(buf, sizeof(buf));        sfs.close();    }    {        int len;        char* buf;        //fstream sfs;        //sfs.open(TEST_FILE);        fstream sfs(TEST_FILE);                sfs.seekg (0, ios::end);        len = sfs.tellg();        sfs.seekg (0, ios::beg);        buf = new char[len];        sfs.read(buf, len);        cout << buf << endl;        delete []buf;        sfs.close();    }}int main(int argc, char* argv[]){       test();    return 0;}

 

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c++檔案讀寫對象，二進位方式和文本方式對比 gaobaolu 發表於 2007-5-21 12:17:00

c++檔案讀寫對象，二進位方式和文本方式對比 //baolu_gao@163.com //測試檔案讀寫的二進位形式和文本形式的區別 //該例兩種情況結果沒有區別，只是文本方式下把10轉化成13，10，即16進位0A變為0D OA ＃i nclude <fstream> ＃i nclude <iostream> using namespace std; class Dog {       private:          int weight;          int age;       public:          Dog(int x=0,int y=0)          {             weight = x;             age = y;              }           void displayDetails()          {               cout << weight << "," << age <<endl;          }                    }; int main() {     Dog dog1(5,10);        //ofstream fout("dogs.dat");     ofstream fout("dogs.dat",ios_base::binary);     fout.write((char *) &dog1,sizeof(dog1));     fout.close();         Dog dog2;    //ifstream fin("dogs.dat");     ifstream fin("dogs.dat",ios_base::binary);     fin.read((char *) &dog2,sizeof dog2);     dog2.displayDetails();        fin.close();         system("pause");     return 0; }