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覆巢之下焉有完卵。出来道上混,迟早是要还的。

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cannot convert 'this' pointer from 'const class CVMR_Capture' to 'class CVMR_Capture &'

2011-06-08 17:24:40| 分类： VC++ | 标签： |举报 |字号大中小订阅

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今天遇了这个错误，呵呵，一开始在类的定义里，把一小段代码原封不动的拷到另一个成员函数内部，结果一直提示这个不能通过编译，看来看去不知道啥原因，后来才发现是const函数的定义引起的，只要把函数定义成普通的类型就行了。呵呵！顺便把const函数复习一下。

出错提示：VMR_Capture.cpp(832) : error C2662: 'GrabFrame' : cannot convert 'this' pointer from 'const class CVMR_Capture' to 'class CVMR_Capture &'

头文件中的定义：

BOOL ConvertRGBtoYUV420P( const BYTE * rgb,BYTE * yuv, unsigned rgbIncrement,BOOL flip ) const;

源文件中的实现：
BOOL CVMR_Capture::ConvertRGBtoYUV420P( const BYTE * rgb,BYTE * yuv, unsigned rgbIncrement,BOOL flip ) const
{

... ...

}

这样在调用其它普通成员函数时就会在编译时提示出错： error C2662: 'GrabFrame' : cannot convert 'this' pointer from 'const class CVMR_Capture' to 'class CVMR_Capture &'

解决办法是把函数定义后面的 “const” 去掉！

const，在前面表示返回的是常量字符指针，在后面表示这个函数不会修改成员变量。

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