入門計劃->使用(C++庫)fstream讀寫檔案 (轉)

入門計劃->使用(C++庫)fstream讀寫檔案 (轉)[@more@]

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//awzzz@2002 //計劃->使用(C++庫)fstream讀寫 //APO->using fstream. //accnce project of using fstream.(c++ iostream library) /* Reference: 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 in charge of the interaction with the file. This pointer can be obtained/modified by calling member ruf. 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 detene 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 #include using namespace std; #ifdef #define TEST_FILE "c:tmptest.txt" #else #define TEST_FILE "/tmp/test.txt" #endif void test() { { //fstream s; //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; }