菜鸟问题？请帮忙啊

[ch4]

我在一个消息处理函数中写了下列代码
CClinetDC dc(this);
dc.TextOut(0,0,"hello world!");
可是编译时报了四个错误，
error C2065: 'CClinetDC' : undeclared identifier
D:\c02\vctest\MyApp\MyAppView.cpp(109) : error C2146: syntax error : missing ';' before identifier 'dc'
D:\c02\vctest\MyApp\MyAppView.cpp(109) : error C2065: 'dc' : undeclared identifier
D:\c02\vctest\MyApp\MyAppView.cpp(110) : error C2228: left of '.TextOutA' must have class/struct/union type
请我我错在哪儿？这些都是教程上这样写的