c_g_convert

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
char* function(const(char)* str, ptrdiff_t len, const(char)* toCodeset, const(char)* fromCodeset, size_t* bytesRead, size_t* bytesWritten, GError** err) c_g_convert;

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