(Unicode C++) Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

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#include <CkCharsetW.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCharsetW charset;

    charset.put_FromCharset(L"utf-8");
    charset.put_ToCharset(L"bom-utf-8");

    bool success = charset.ConvertFile(L"qa_data/txt/helloWorld.txt",L"qa_output/helloWorldBom.txt");
    if (success != true) {
        wprintf(L"%s\n",charset.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");
    }