(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.

Chilkat C/C++ Library Downloads
MS Visual C/C++ C++ Builder Linux C/C++ Alpine Linux C/C++	MacOS C/C++ iOS C/C++ Android C/C++ MinGW C/C++

#include <C_CkCharsetW.h>

void ChilkatSample(void)
    {
    HCkCharsetW charset;
    BOOL success;

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

    charset = CkCharsetW_Create();

    CkCharsetW_putFromCharset(charset,L"utf-8");
    CkCharsetW_putToCharset(charset,L"bom-utf-8");

    success = CkCharsetW_ConvertFile(charset,L"qa_data/txt/helloWorld.txt",L"qa_output/helloWorldBom.txt");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCharsetW_lastErrorText(charset));
        CkCharsetW_Dispose(charset);
        return;
    }

    wprintf(L"Success.\n");


    CkCharsetW_Dispose(charset);

    }