如果是Text中的可用下面的代码
API声明
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
撤消
rt = SendMessage(Me.Text1.hWnd, EM_UNDO, 0&, 0&)
API声明
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
撤消
rt = SendMessage(Me.Text1.hWnd, EM_UNDO, 0&, 0&)
下面是关于EM_UNDO的说明
EM_UNDO
An application sends an EM_UNDO message to undo the last edit control operation. EM_UNDO
wParam = 0; // not used; must be zero
lParam = 0; // not used; must be zero
Parameters
This message has no parameters. Return Values
For a single-line edit control, the return value is always TRUE. For a multiline edit control, the return value is TRUE if the undo operation is successful, or FALSE if the undo operation fails. Res
An undo operation can also be undone. For example, you can restore deleted text with the first EM_CANUNDO message, and remove the text again with a second EM_CANUNDO message as long as there is no intervening edit operation.