QT connect函数的用法

代码如下，connect(pushbuttonSet,SIGNAL(clicked()),chatform,SLOT(show()));//用关联实现窗口的弹出
//pushubuttonSet是按钮名称，chatform是要弹出的窗口的类
出现错误：expected constructor, destructor, or type conversion before '(' token
按照你的方法改正之后会出现这个问题
错误:'pushbuttonSet' was not declared in this scope

connect(pushbuttonSet,SIGNAL(clicked()),this,SLOT(OnBtnSet()));

this class://就是pushbuttonSet所在的类
.h//头文件
slots:
void OnBtnSet();

.cpp
void OnBtnSet(){
chatform.show();

}