使用extern声明类对象 [英] Using extern to declare class objects

问题描述

朋友们...
我在一个cpp文件中声明一个类的对象，并使用该对象调用函数.现在，我想在另一个cpp文件中使用同一对象.我试图使用extern在另一个文件中声明该对象，但是链接器给我一个错误，该错误已定义对象.

第一个cpp文件:

Hi friends...
I am declaring object of a class in one cpp file and calling functions using that object. Now I want to use same object in another cpp file. I am trying to declare that object in another file using extern, but linker gives me an error that object is already defined.

First cpp file:

CClientSock client;
lv_status = client.startup();
if (lv_status != 0)
{
    MessageBox("Connection Failed");
    exit(1);
}

第二个cpp文件:

Second cpp file:

extern CClientSock client;
client.connectSocket();

请提出解决方案.请让我知道是否需要更多信息.谢谢！

Please suggest the solution. Kindly let me know if more info is required. Thank you!

推荐答案

嗨.我更改了对象"client"的名称&问题得到解决.不知道如何...:)

Hi .. I changed the name of object ''client'' & the problem got resolved . Dont know how ...:)

类不能是外部的.在头文件中声明类，并改用它们. :)

http://publib.boulder.ibm. com/infocenter/macxhelp/topic/com.ibm.vacpp6m.doc/language/ref/clrc03extsc.htm [

Classes cannot be extern. Declare classes in a header file and use them instead. :)

http://publib.boulder.ibm.com/infocenter/macxhelp/topic/com.ibm.vacpp6m.doc/language/ref/clrc03extsc.htm[^]

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