//建立按钮上标签的字符串 label = XmStringCreateSimple["Hello World!"] n = 0 XtSetArg[args[n], XmNlab

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//建立按钮上标签的字符串 label = XmStringCreateSimple["Hello World!"] n = 0 XtSetArg[args[n], XmNlabelString, label] n++ button = XmCreatePushButton[toplevel, "pushbutton", args, n] XtManageChild[button] XmStringFree[label] //设置回调函数 XtAddCallback[button, XmNactivateCallback, callback, NULL]

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