Gets a string chunk from current StreamReader offset by copying buffer_len bytes in to buffer str.
bool UltraLite_StreamReader_iface::GetStringChunk( char * str, size_t buffer_len, size_t * len_retn, bool * morebytes )
str A pointer to an array of characters.
buffer_len The length of the buffer, or array. The buffer_len must be greater than or equal to 0.
len_retn An output parameter. The length returned.
morebytes An output parameter. True if there are more characters to read.
The characters are read from where the last read left off unless you use SetReadPosition function.
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