将 array^ 数据转换为 const byte* 数据 - C++/CLR
我试图从 C# 调用 C 中的函数,尽管 C ++
所以基本上是 C# -> C++ - >C
在 C# 中,我有 byte[] 字节 - 它从文件中读取信息。我将字节数组和大小传递给 C++ 。
在 C++ 中,我得到字节数组和大小,但无法转换为特定的数据类型。
void Image::OpenMemFile(array<Byte>^ data, unsigned int size)
{
Free();
m_dataStream = data;
Byte const* streamData = &data[0]; // this is where it throws error
// Should I use marshaling here ? What call should that ;be ?
hImage = ::OpenMemImage(streamData , size);
modified = false;
}
// this is the function I need to call
EXIVSIMPLE_API HIMAGE OpenMemImage(const BYTE *data, unsigned int size)
{
// code
imgWrap->image = Exiv2::ImageFactory::open(data, size);
}
它需要调用的 C 函数是
Image::AutoPtr ImageFactory::open(const byte* data, long size)
{
/// code
}
我需要帮助将字节数组转换为 const byte* 。我意识到我需要使用封送处理。 C++ 中是否有特定的函数来编组数组?
任何帮助表示赞赏。
谢谢
I am trying to call a function in C from C# though c ++
so basically C# -> C++ - >C
In C#, I have byte[] bytes - which reads the information from the file. I am passing the byte array and the size to C++ .
In C++ I get the byte array and the size but I am not able to convert to the specific data types.
void Image::OpenMemFile(array<Byte>^ data, unsigned int size)
{
Free();
m_dataStream = data;
Byte const* streamData = &data[0]; // this is where it throws error
// Should I use marshaling here ? What call should that ;be ?
hImage = ::OpenMemImage(streamData , size);
modified = false;
}
// this is the function I need to call
EXIVSIMPLE_API HIMAGE OpenMemImage(const BYTE *data, unsigned int size)
{
// code
imgWrap->image = Exiv2::ImageFactory::open(data, size);
}
the C function it needs to call is
Image::AutoPtr ImageFactory::open(const byte* data, long size)
{
/// code
}
I need to help in converting the byte array to const byte* . I realize I need to use Marshaling. Is there a specific function to marshal arrays in C++ ?
Any help is appreciated.
Thanks
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