C ++中的静态方法 [英] Static methods in C++

问题描述

我在使用C ++中的静态方法时遇到一些麻烦

示例.h：

  class IC_Utility {
 public：
 IC_Utility（）; 
〜IC_Utility（）; 
 
 std :: string CP_PStringToString（const unsigned char * outString）; 
 void CP_StringToPString（std :: string& inString，unsigned char * outString，short inMaxLength）; 
 static void CP_StringToPString（std :: string& inString，unsigned char * outString）; 
 void CP_StringToPString（FxString& inString，FxUChar * outString）; 
 
}; 
  

示例.cpp：

  static void IC_Utility :: CP_StringToPString（std :: string& inString，unsigned char * outString）
 {
 short length = inString.length 
 
 if（outString！= NULL）
 {
 if（length> = 1）
 CPLAT :: CP_Utility :: CP_CopyMemory（inString.c_str & outString [1]，length）; 
 
 outString [0] = length; 
} 
} 
  

我想打一个电话：

  IC_Utility :: CP_StringToPString（directoryNameString，directoryName）; 
  

但我得到一个错误：

 错误：无法声明成员函数'static void IC_Utility :: CP_StringToPString（std :: string& unsigned char *）'以具有静态链接
  / pre> 
 
 
我不明白为什么我不能这样做。 
解决方案
删除 static 方法定义中的关键字。 
 
 
 
  static 关键字放在.cpp文件中意味着某个函数有一个静态连接，即。它只能从同一文件中的其他函数访问。
 
I am having a little trouble working with static methods in C++

Example .h:
class IC_Utility {
public:
    IC_Utility();
    ~IC_Utility();

    std::string CP_PStringToString( const unsigned char *outString );
    void CP_StringToPString( std::string& inString, unsigned char *outString, short inMaxLength );
    static void CP_StringToPString( std::string& inString, unsigned char *outString);
    void CP_StringToPString( FxString& inString, FxUChar *outString);

};
Example .cpp:
static void IC_Utility::CP_StringToPString(std::string& inString, unsigned char *outString)
{
    short       length = inString.length();

   if( outString != NULL )
    {
        if( length >= 1 )
            CPLAT::CP_Utility::CP_CopyMemory( inString.c_str(), &outString[ 1 ], length );

            outString[ 0 ] = length;
    }
}
I wanted to make a call like:
IC_Utility::CP_StringToPString(directoryNameString, directoryName );
But I get an error:
error: cannot declare member function 'static void IC_Utility::CP_StringToPString(std::string&, unsigned char*)' to have static linkage
I dont understand why I cannot do this. Can anyone help me understand why and how to achieve what I want?
解决方案
Remove static keyword in method definition. Keep it just in your class definition.

static keyword placed in .cpp file means that a certain function has a static linkage, ie. it is accessible only from other functions in the same file.

                        
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