Read and write files for [C + + language Basics]

1. Open and close the file:

file* fp = fopen (String.c_str (), FLAG);

• STRING.C_STR (): Requires C-language string form;
• Flag Description:
  • R: Read-only mode open;
  • W: Write-only mode open;
  • A: Open by append mode;
  • r+: Open in read/write mode; (No files: error)
  • w+: Open in read/write mode; (no files: new)

int fclose (file* fp);

• Success: returns 0;
• Failure: Returns EOF;

2. Read and Write files:

• N-1 characters are read from the stream, unless a line is read, the parameter S is to receive the string, and if successful returns a pointer to s, otherwise null

3. End of file test: int feof (*FP);
The end of the currently reached file returns non 0, otherwise returns 0


 
   

Using the FStream method:

1. Include Header files:

#include <fstream>ofstream         //File write operation memory writes to storage device Ifstream         //file read operation, storage device read to memory FStream          

2. Open the file:

void Open (const char * filename, Ios_base::openmode mode = Ios_base::in | ios_base::out); void open (const wchar_t *_file Name, Ios_base::openmode mode= ios_base::in | ios_base::out, int prot = Ios_base::_openprot);

　　

Read and write files for [C + + language Basics]