获得丰富的编辑控件中的整个文本作为CString的各种方法

Question

I want to get the entire text in a rich edit control as a CString, and from my reaseach there appear to be six ways of achieving this:

1. GetTextRange and get the range by using GetTextLength
2. EM_GETTEXTEX
3. GetWindowText
4. GetDlgItemText
5. WM_GETETXT
6. EM_STREAMOUT

My questions are as follows:

1. What is the difference between using methods such as GetTextRange , GetWindowText , and GetDlgItemText versus using messages such as EM_GETTEXTEX , WM_GETETXT , and E M_STREAMOUT .
2. When would you use one type, and when would you use another?
3. What is the difference between EM_GETTEXTEX , WM_GETETXT , and EM_STREAMOUT in terms of accomplishing this task of getting the entire text in a rich edit control as a CString ?
4. Finally would it be possible for someone to provide an example of how to use EM_GETTEXTEX , or point me in the direction of one online?

Answer 1

All are the same, except EM_STREAMOUT.

No. 1 to 5 just get the plain text. No. 6 gets the complete RTF stream. So No. 1. to 5. are just methods that do nearly the same as sending WM_GETTEXT.