From Tracker Software PDF SDK
Insert new variant with type
PVT_String and specified value into array container.
HRESULT Arr_InsertString([in] LPWSTR sVal, [in, defaultvalue(-1)] ULONG nBefore);
- [in] Pointer to null-terminated Unicode string, which will be used as variant value. If string can be represented as ASCII string it will be stored using single byte per character, otherwise two bytes per characters will be used (same as in Unicode). If you need to add ASCII string to array it will be faster to use Arr_InsertStringR, but please note that if your string contain characters with codes greater than 127 they will be interpreted as codes from PDFDocEncoding, not as codes from current code page.
- [in, defaultvalue(-1)] Specifies index of element before which we will insert new one. If index is greater or equal array size new element will be inserted at the end of array.
Returns S_OK if operation was successful or error code in other cases.