(Objective-C) Write utf-8 CSV Compatible with Excel

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A CSV containing non-English characters that is saved using the utf-8 character encoding must include a BOM (also known as a preamble) if it is to be correctly loaded into Excel. See https://en.wikipedia.org/wiki/Byte_order_mark

This example shows how to save the CSV to a file using utf-8 with a BOM.

Note: This example requires Chilkat v9.5.0.93 or later.

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#import <CkoCsv.h>

// This example program loads a file (japanese.csv)
// that contains this content:
// 
// year,color,country,food
// 2001,red,France,cheese
// 2005,blue,"United States",hamburger
// 2008,green,Italy,pasta
// 1998,orange,Japan,sushi
// 2010,silver,"",""
// 

CkoCsv *csv = [[CkoCsv alloc] init];
csv.HasColumnNames = YES;
BOOL success = [csv LoadFile2: @"qa_data/csv/test.csv" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",csv.LastErrorText);
    return;
}

// To save the CSV using utf-8 with a BOM/preamble, 
// add "EMIT_BOM" to the UncommonOptions.
// (This feature was added in Chilkat v9.5.0.93)

csv.UncommonOptions = @"EMIT_BOM";
success = [csv SaveFile2: @"qa_output/test.csv" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",csv.LastErrorText);
    return;
}

NSLog(@"%@",@"OK, try to load the CSV in Excel to see if the non-English chars are correct.");