Visual C++, CArchive Serialize

Visual C++, CArchive Serialize

本文关键字：Serialize CArchive C++ Visual      更新时间：2023-10-16

我用Visual Studio 2010学习Visual c++。我尝试使用MFC对象的序列化功能。我不能用Serialize函数加载对象我的代码:

#include <afxwin.h>
#include <iostream>
using std::cout;
using std::endl;
// CMyObject
class CMyObject : public CObject
{
public:
    int x, y;
    CMyObject(int _x=0, int _y=0) : CObject(), x(_x), y(_y) {}
    void Serialize(CArchive &ar);
    void Print() const;
    DECLARE_SERIAL(CMyObject)
};
IMPLEMENT_SERIAL(CMyObject, CObject, 1)
void CMyObject::Serialize(CArchive &ar)
{
    CObject::Serialize(ar);
    if (ar.IsStoring())
        ar << x;
    else
        ar >> x;
}
void CMyObject::Print() const
{
    cout << "CMyObject (" << x << "," << y << ")" << endl;
}

int main()
{
    CMyObject cm(1,3);
    CFile fileS, fileL;
    fileS.Open(L"C:\CMyObject.dat", CFile::modeWrite | CFile::modeCreate);
    CArchive arStore(&fileS, CArchive::store);
    cm.Print();
    cm.Serialize(arStore);
    arStore.Close();
    cm.x = 2;
    cm.Print();
    fileL.Open(L"C:\CMyObject.dat", CFile::modeRead);
    CArchive arLoad(&fileL, CArchive::load);
    cm.Serialize(arLoad);
    cm.Print();
    arLoad.Close();
}

程序在字符串上死亡:

    cm.Serialize(arLoad);

你能告诉我这个代码有什么问题吗?

您应该检查对Open()的调用是否失败。您在完成写入后忘记关闭文件。关闭归档对象后添加fileS.Close();。

if(!fileS.Open(L"C:\source\CMyObject.dat", CFile::modeWrite | CFile::modeCreate))
{
    std::cout << "Unable to open output file" << std::endl;
    return 1;
}
CArchive arStore(&fileS, CArchive::store);
cm.Print();
cm.Serialize(arStore);
arStore.Close();
fileS.Close();  //  <--- close the file

if(!fileL.Open(L"C:\source\CMyObject.dat", CFile::modeRead))
{
    std::cout << "Unable to open input file" << std::endl;
    return 1;
}
CArchive arLoad(&fileL, CArchive::load);
cm.Serialize(arLoad);
cm.Print();
arLoad.Close();
fileL.Close();  //  <--- close the file

为了让MFC在反序列化过程中动态创建对象，你的类定义必须提供一个不带参数的构造函数。参考:

http://msdn.microsoft.com/en-us/library/47ecfxkh.aspx

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