使用(C++库)ifstream读文件数据

入门计划->使用(C++库)ifstream读文件数据 选择自 awzzz 的 Blog 关键字 入门计划 C++ ifstream 读文件 读文件数据 出处

收藏+原创 //awzzz@2002 //入门计划->使用(C++库)ifstream读文件数据 //APO->using ifstream. //accidence project of using ifstream.(c++ iostream library) /* Reference: http://www.cplusplus.com/ref/iostream/ifstream/ Description ifstream class provides a stream interface to read data from 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 ifstream object. */ //使用(C++库)ifstream读文件数据 //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" #endif void get() { //ifstream ifs; //ifs.open(TEST_FILE); ifstream ifs(TEST_FILE); //while (ifs.good()) cout << (char) ifs.get();//simple while (ifs.good()) { char ch = 0; //ch = ifs.get(); ifs.get(ch); cout << ch; } ifs.close(); } void getline() { //ifstream ifs; //ifs.open(TEST_FILE); ifstream ifs(TEST_FILE); while (ifs.good()) { char buf[1024] = {0}; ifs.getline(buf, sizeof(buf)); cout << buf << endl; } ifs.close(); } int main(int argc, char* argv[]) { get(); getline(); return 0; }