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名羽 — Wed, 25 Feb 2009 09:32:00 GMT

在分析ACE的原码时发现有一�U��^时比较少见的调用方式�Q�记得以前有人用C++描述Command时也用了�q�种方式,不过他们的代码都包装为模�?不方便理�?�q�里,我不用模板简单的展示其特点：(x��)

#include <iostream>
using namespace std;

class CA
{
public:
    CA()
    {
        cc = 1;
    };

    int func1(int a, int x)
    {
        cout<<"func1"<<endl;

        cc = a + x;
        cout<<"cc is :"<< cc <<endl;
        return cc;
    }
    int func2(int a, int y)
    {
        cout<<"func2"<<endl;
        cc = cc + a * y;
        cout<<"cc is:"<<cc<<endl;
        return cc;
    }

    typedef int (CA::*FUNC)(int a, int y);

    int Test1()
    {
        FUNC f;
        f = &CA::func2;

        return (this->*f) (10, 20);
    }

    int test2(FUNC func,int a, int b)
    {
        //ACE中是先做一些共同的复杂的事,然后调用不同的func部分:
        return (this->*func)(a,b);
    }
private:
    int cc;
};

int main( void )
{
    CA a;
    a.Test1();
    a.test2(&CA::func2,11,3);
    return 0;
}

很酷!调用者可以把�cȝ��函数作�ؓ(f��)参数传�?
好再开下面,利用�l�承的关�p?我们�q�可以做到同��h��?

#include <iostream>
using namespace std;
class CB
{
public:
    virtual int func1(int a, int x)=0;
    virtual int func2(int a, int x)=0;
    typedef int (CB::*FUNC)(int a, int y);

    int Test1()
    {
        FUNC f;
        f = &CB::func2;
        return (this->*f) (10, 20);
    }

    int test2(FUNC func,int a, int b)
    {
        return (this->*func)(a,b);
    }
};

class CA:public CB
{
public:
    CA()
    {
        cc = 1;
    };

    int func1(int a, int x)
    {
        cout<<"func1"<<endl;

        cc = a + x;
        cout<<"cc is :"<< cc <<endl;
        return cc;
    }
    int func2(int a, int y)
    {
        cout<<"func2"<<endl;
        cc = cc + a * y;
        cout<<"cc is:"<<cc<<endl;
        return cc;
    }


private:
    int cc;
};

int main( void )
{
    CB *pB = new CA();
    pB->Test1();
    pB->test2(&CB::func2,11,3);
    delete pB;
    return 0;
}

上面的例子如果应用到Command模式�?func1 和func2��可以分别是Execute �?UnDo的接口了.至于如何实现,��是�z��cȝ��问题�?
(上述代码均在MinGW中测试通过)

名羽 2009-02-25 17:32 发表评论

名羽 — Fri, 30 Mar 2007 07:02:00 GMT

目前对Openh323的源代码已有较多的了解，开始对部分协议�q�行扩展例如H245�?x��)议��理部分�Q?CIF的加入．另外现有的协议栈代码中没有实现T120通道的数字会(x��)议，目前正对该部分进行补充．

名羽 2007-03-30 15:02 发表评论

Link errors for argv, argc, __mbctype

名羽 — Thu, 22 Jun 2006 03:48:00 GMT

Windows: Using MFC, get unresolved external symbol errors for __argv, __argc, __mbctype

When I then compile the program it links with the multi threaded libraries but I get the following errrors:

nafxcw.lib(appcore.obj) : error LNK2001: unresolved external symbol ___argv
nafxcw.lib(appcore.obj) : error LNK2001: unresolved external symbol ___argc
nafxcw.lib(filelist.obj) : error LNK2001: unresolved external symbol __mbctype

The solution:

名羽 2006-06-22 11:48 发表评论

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Link errors for __argv, __argc, __mbctype

Link errors for argv, argc, __mbctype