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以下是引用不懂才问在2015-12-8 12:07:57的发言：

我在main.prg里声明一个公共类里面有clear events

共性与个性最好能明确清晰一点。
如：

程序代码：

blLogin = .F.
loginForm = CREATEOBJECT("logForm")
loginForm.show
READ EVENTS
IF !blLogin
    MESSAGEBOX("登录失败","提示")
    IF _VFP.StartMode == 4
        QUIT
    ELSE
        CLEAR ALL 
        RETURN
    ENDIF
ENDIF
主程序()
CLEAR ALL 

PROCEDURE 主程序
    MESSAGEBOX("主程序")
ENDPROC

DEFINE CLASS logForm as  FormShow2
    caption="欢迎登录材料管理系统"
    autoCenter=.t.
    width=300
    height=200
    titleBar=0
    picture="登录背景.bmp"
    icon="logo.ico"
    controlBox=.f.

    ADD OBJECT cmdOk     as BtnBase WITH top=168,left=160,height=25,width=60,caption="确 定"
    ADD OBJECT cmdCancel as exitBtn WITH top=168,left=228,height=25,width=60,caption="取 消"

    PROCEDURE cmdOk.Click
        blLogin = .T.
        thisform.Release
    ENDPROC
    
    PROCEDURE Destroy
        CLEAR EVENTS 
    ENDPROC 
ENDDEFINE


DEFINE CLASS FormShow2 as FormBase  
    ShowWindow = 2
    * add user code here
ENDDEFINE

DEFINE CLASS FormShow1 as FormBase 
    ShowWindow = 1
    * add user code here
ENDDEFINE

DEFINE CLASS FormBase as Form 
    * add user code here
ENDDEFINE

DEFINE CLASS exitBtn as BtnBase
    PROCEDURE click
        RELEASE thisform 
    ENDPROC 
ENDDEFINE

DEFINE CLASS BtnBase as CommandButton 
    * add user code here
ENDDEFINE

[此贴子已经被作者于2015-12-8 21:09编辑过]