Read Write and Append using mode

 


let fs = require("fs");
//======================Example 1===============

// fs.open("input.txt",'r',function (error,data) {
//     if(error){
//         console.error('Error: File Not Found.');
//     }
//
//     /*
//     data receive integer value
//     * When you open a file using fs.open(),
//     * Node.js returns an integer value called
//     * a file descriptor.
//     * This is a low-level
//     * reference used by the
//     * operating system to access and
//     * manipulate the open file.
//     *
//     * */
//
//     console.log(`file descriptor=${data}`);
//     //============Read data in Chuck Format ========
//     const buffer = Buffer.alloc(1024);
//
//     fs.read(data, buffer, 0, buffer.length, 0, function(err, bytesRead) {
//         if (err) {
//             console.error('Error reading file.');
//             return;
//         }
//
//         if (bytesRead > 0) {
//             console.log('File Contents:\n' + buffer.toString('utf8', 0, bytesRead));
//         }
//
//         fs.close(data, () => {});
//     });
//
//     //============Read data in Chuck Format ========
//
//
// });

//=========Write mode=======Example2
fs.open("input.txt",'a',function (error,data) {

    //======error=====

    //=====write====
    fs.write(data,"2 ==========The Computer is an eectronic device",function (error,w,str) {
        if(error){
            console.log(`Error:${error}`);
        }
    })


});


// fs.writeFile('Files/Prem.txt','The Computer is and',function (error,fd) {
//     if(error){
//         console.log(`Error:${error}`);
//     }
//     console.log('File Create Successfully. and Write New Data.');
//
// })

//======================Example 2===============

// fs.stat('Files',function (error,status) {
//     console.log(status);
//     console.log(`Status=${status}`);
//     console.log(`Status=${status.isFile()}`);
//     console.log(`isDir=${status.isDirectory()}`);
// });

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