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Gets the length of the annotation object's text (character string).
#include "ltwrappr.h"
virtual L_SIZE_T LAnnRTF::GetTextLen()
The length of the annotation object's character string.
Use this value to allocate a buffer to read the text property.
To get the length of Rich Text formatted text, use LAnnRTF::GetTextRTF.
Win32, x64.
For an example, refer to LAnnRTF::GetText.
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