Functions

Creates an in-memory channel, which will be a reference stream of bytes.

1var byteChannel = io:createReadableChannel(content);

Read the entire file content as a stream of blocks.

1stream<io:Block, io:Error?>|io:Error content = io:fileReadBlocksAsStream("./resources/myfile.txt", 1000);

Read the entire file content as a byte array.

1byte[]|io:Error content = io:fileReadBytes("./resources/myfile.txt");

Read file content as a CSV.

1string[][]|io:Error content = io:fileReadCsv("./resources/myfile.csv");

Read file content as a CSV.

1stream<string[], io:Error?>|io:Error content = io:fileReadCsvAsStream("./resources/myfile.csv");

Reads file content as a JSON.

1json|io:Error content = io:fileReadJson("./resources/myfile.json");

Reads the entire file content as a list of lines. The resulting string array does not contain the terminal carriage (e.g., \r or \n).

1string[]|io:Error content = io:fileReadLines("./resources/myfile.txt");

Reads file content as a stream of lines. The resulting stream does not contain the terminal carriage (e.g., \r or \n).

1stream<string, io:Error?>|io:Error content = io:fileReadLinesAsStream("./resources/myfile.txt");

Reads the entire file content as a string. The resulting string output does not contain the terminal carriage (e.g., \r or \n).

1string|io:Error content = io:fileReadString("./resources/myfile.txt");

Reads file content as an XML.

1xml|io:Error content = io:fileReadXml("./resources/myfile.xml");

Write a byte stream to a file.

1byte[] content = [[60, 78, 39, 28]];
2stream<byte[], io:Error?> byteStream = content.toStream();
3io:Error? result = io:fileWriteBlocksFromStream("./resources/myfile.txt", byteStream);

Write a set of bytes to a file.

1byte[] content = [60, 78, 39, 28];
2io:Error? result = io:fileWriteBytes("./resources/myfile.txt", content);

Write CSV content to a file.

1string[][] content = [["Anne", "Johnson", "SE"], ["John", "Cameron", "QA"]];
2io:Error? result = io:fileWriteCsv("./resources/myfile.csv", content);

Write CSV record stream to a file.

1string[][] content = [["Anne", "Johnson", "SE"], ["John", "Cameron", "QA"]];
2stream<string[], io:Error?> recordStream = content.toStream();
3io:Error? result = io:fileWriteCsvFromStream("./resources/myfile.csv", recordStream);

Write a JSON to a file.

1json content = {"name": "Anne", "age": 30};
2io:Error? result = io:fileWriteJson("./resources/myfile.json", content);

Write an array of lines to a file. During the writing operation, a newline character \n will be added after each line.

1string[] content = ["Hello Universe..!!", "How are you?"];
2io:Error? result = io:fileWriteLines("./resources/myfile.txt", content);

Write stream of lines to a file. During the writing operation, a newline character \n will be added after each line.

1string content = ["Hello Universe..!!", "How are you?"];
2stream<string, io:Error?> lineStream = content.toStream();
3io:Error? result = io:fileWriteLinesFromStream("./resources/myfile.txt", lineStream);

Write a string content to a file.

1string content = "Hello Universe..!!";
2io:Error? result = io:fileWriteString("./resources/myfile.txt", content);

Write XML content to a file.

1xml content = xml `<book>The Lost World</book>`;
2io:Error? result = io:fileWriteXml("./resources/myfile.xml", content);

Prints any, error, or string templates(such as The respective int value is ${val}) value(s) to a given stream(STDOUT or STDERR).

1io:fprint(io:stderr, "Unexpected error occurred");

Prints any, error, or string templates(such as The respective int value is ${val}) value(s) to a given stream(STDOUT or STDERR) followed by a new line.

1io:fprintln(io:stderr, "Unexpected error occurred");

Retrieves a readable CSV channel from a given file path.

1io:ReadableCSVChannel rCsvChannel = check io:openReadableCsvFile(srcFileName);

Retrieves a ReadableByteChannel from a given file path.

1io:ReadableByteChannel readableFieldResult = check io:openReadableFile("./files/sample.txt");

Retrieves a writable CSV channel from a given file path.

1io:WritableCSVChannel wCsvChannel = check io:openWritableCsvFile(srcFileName);

Retrieves a WritableByteChannel from a given file path.

1io:WritableByteChannel writableFileResult = check io:openWritableFile("./files/sampleResponse.txt");

Prints any, error, or string templates (such as The respective int value is ${val}) value(s) to the STDOUT.

1io:print("Start processing the CSV file from ", srcFileName);

Prints any, error or string templates(such as The respective int value is ${val}) value(s) to the STDOUT followed by a new line.

1io:println("Start processing the CSV file from ", srcFileName);

Retrieves the input read from the STDIN.

1string choice = io:readln("Enter choice 1 - 5: ");
2string choice = io:readln();