如何把自定义结构的数据存储到COleVariant中呢

[xcs99321]

如题

[teleinfor]

自定的数据结构采用指针方式保存到COleVariant不就行了。
这么多构造函数，必有一款适合你！

COleVariant::COleVariant
Constructs a COleVariant object.

 COleVariant( ); 
COleVariant(
   const VARIANT& varSrc 
);
COleVariant(
   const COleVariant& varSrc 
);
COleVariant(
   LPCVARIANT pSrc 
);
COleVariant(
   LPCTSTR lpszSrc 
);
COleVariant(
   LPCTSTR lpszSrc,
   VARTYPE vtSrc 
);
COleVariant(
   CString& strSrc 
);
COleVariant(
   BYTE nSrc 
);
COleVariant(
   short nSrc,
   VARTYPE vtSrc = VT_I2 
);
COleVariant(
   long lSrc,
   VARTYPE vtSrc = VT_I4 
);
COleVariant(
   const COleCurrency& curSrc 
);
COleVariant(
   float fltSrc 
);
COleVariant(
   double dblSrc 
);
COleVariant(
   const COleDateTime& timeSrc 
);
COleVariant(
   const CByteArray& arrSrc 
);
COleVariant(
   const CLongBinary& lbSrc 
);
COleVariant(
   LPCITEMIDLIST pidl
);

[teleinfor]

COleVariant Members
Construction

COleVariant

Constructs a COleVariant object.

Operations
Attach

Attaches a VARIANT to a COleVariant.

ChangeType

Changes the variant type of this COleVariant object.

Clear

Clears this COleVariant object.

Detach

Detaches a VARIANT from a COleVariant and returns the VARIANT.

GetByteArrayFromVariantArray

Retrieves a byte array from an existing variant array.

SetString

Sets the string to a particular type, typically ANSI.

Operators
operator =

Copies a COleVariant value.

operator ==

Compares two COleVariant values.

operator LPCVARIANT

Converts a COleVariant value into an LPCVARIANT.

operator LPVARIANT

Converts a COleVariant object into an LPVARIANT.

Archive/Dump
operator <<

Outputs a COleVariant value to CArchive or CDumpContext.

operator >>

Inputs a COleVariant object from CArchive.

[xcs99321]

我的需求是需要把数据所有信息储存到COleVariant中，光存储指针不能满足我的需要

[雪影]

例如

struct  ST
{
int   a;
long b;
float c;
char* psz;
}
=>
ST A； 
COleVariant m1(ST.a);
COleVariant m2(ST.b);
COleVariant m3(ST.c);
COleVariant m4(ST.psz);
COleSafeArray arr;
DWORD numElements[] = {4};
arr.Create(VT_VARIANT, 1, numElements);
long index = 0;
arr.PutElement(&index,m1);
index = 1;
arr.PutElement(&index,m2);
index = 2;
arr.PutElement(&index,m3);
index = 3;
arr.PutElement(&index,psz);

//将数组的值复给COleVariant对象
COleVariant var(arr.Detach());

[xcs99321]

简单的说吧，我现在有一个复数类
class CComplex
{
public:
double Re;
double Im;
};
//cp=12+34i
CComplex cp;
cp.Re=12;
cp.Im=34;

由于提供给用户接口中，一个复数只对应一个统一个到COleVariant，需要把cp存储到COleVariant中，且保证CComplex信息完整性，支持串行化等，不知道COleVariant即VARIANT类型有没有机制支持自定义类型？

[雪影]

首先构造一个COleSafeArray对象成员，将结构体中的数据成员逐个封装为COleVariant对象然后插入COleSafeArray对象成员中

最后将COleSafeArray的对象赋值给COleVariant对象

[xcs99321]

感谢tttyd
O了，结贴！

[xcs99321]

感谢所有回帖的，哈哈

[雪影]

class CComplex
{
public:
  double Re;
  double Im;
};
//cp=12+34i
CComplex cp;
cp.Re=12;
cp.Im=34;

COleSafeArray arr;
DWORD numElements[] = {2};
arr.Create(VT_VARIANT, 1, numElements);
long index = 0;
arr.PutElement(&index,COleVariant(cp.Re));
index = 1;
arr.PutElement(&index,COleVariant(cp.Im));


//将数组的值复给COleVariant对象
COleVariant var(arr.Detach());

[xcs99321]

有高手在，我顺便多问一句：
有没有方法我标识一下这个COleVariant里面不是普通的一维数组呢，还是我一个我自定义数据结构呢
我突然想到两种办法
1：使用VARIANT的保留字

2：第一个变量为自己类型名，
class CComplex
{
public:
double Re;
double Im;
};
//cp=12+34i
CComplex cp;
cp.Re=12;
cp.Im=34;

COleSafeArray arr;
DWORD numElements[] = {3};
arr.Create(VT_VARIANT, 1, numElements);
long index = 0;
arr.PutElement(&index,COleVariant(“CComplex”));
index = 1;
arr.PutElement(&index,COleVariant(cp.Re));
index = 2;
arr.PutElement(&index,COleVariant(cp.Im));


//将数组的值复给COleVariant对象
COleVariant var(arr.Detach());

不知道有没有更好的办法呢

[雪影]

1：使用VARIANT的保留字
什么保留字？
2：第一个变量为自己类型名，
没有必要

不知道有没有更好的办法呢
除此之外，没有其他办法，纯win32 api封装更麻烦

[xcs99321]

struct tagVARIANT
{
union
{
struct __tagVARIANT
{
VARTYPE vt;
WORD wReserved1;
WORD wReserved2;
WORD wReserved3;
...
}
保留字wReserved1，wReserved2，wReserved3

[雪影]

不行~~

[iqyely]

恩恩，来学习下了。