CEdit类的setsel函数//第一个参数怎么还是-1？DWORD不是unsigned long...
void SetSel( DWORD dwSelection, BOOL bNoScroll = FALSE );
dwSelection
Specifies the starting position in the low-order word and the ending position in the high-order word. If the low-order word is zero and the high-order word is 1, all the text in the edit control is selected. If the low-order word is 1, any current selection is removed.

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use:
void SetSel(int nStartChar, int nEndChar, BOOL bNoScroll = False);
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引用:

下面参数解释不是说赋值为-1吗？？？DWORD不是unsigned long吗？怎么能赋值为-1呢?

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根据解释，这里的所谓dword实际上是表示4个字节而已。高位2字节和低位2字节可分开用。

高低两个字可分别赋值,无符号也好，有符号也好，总归是4个字节32位吧？每一位不是0便是1。short h = -1;short l=0;dword a = (h<<16)
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l;