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ATField 2007-02-16
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既然是图片文件，那么自然是二进制了。
IStream::Read用法如下：
HRESULT Read(
void* pv,
ULONG cb,
ULONG* pcbRead
);
Parameters
pv
[out] Pointer to the buffer into which the stream data is read. If an error occurs, this value is NULL.
cb
[in] Number of bytes of data to attempt to read from the stream object.
pcbRead
[out] Pointer to a ULONG variable that receives the actual number of bytes read from the stream object.
You can set this pointer to NULL to indicate that you are not interested in this value. In this case, this method does not provide the actual number of bytes read.
IStream::Read用法如下：
HRESULT Read(
void* pv,
ULONG cb,
ULONG* pcbRead
);
Parameters
pv
[out] Pointer to the buffer into which the stream data is read. If an error occurs, this value is NULL.
cb
[in] Number of bytes of data to attempt to read from the stream object.
pcbRead
[out] Pointer to a ULONG variable that receives the actual number of bytes read from the stream object.
You can set this pointer to NULL to indicate that you are not interested in this value. In this case, this method does not provide the actual number of bytes read.
lovev8 2007-02-16
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IStream->Read 如何用？
lovev8 2007-02-16
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我是从CFile读取的图片文件，然后用CFile.Read(m_pStreamData, (UINT)iFileSize)将文件数据读入到IStream中，不知道这时候IStream里的数据是文本还是二进制格式？
ATField 2007-02-16
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可以调用IStream->Read方法读取IStream中的数据，然后写到文本文件中。
不过有个问题，为什么要写到文本文件中？IStream中可能是二进制数据，直接写到文件里面文件就不是文本了。如果一定要保存为文本，可以将Istream->Read返回的二进制数据用Base64编码成ASCII字符，然后再写到文本文件中。
不过有个问题，为什么要写到文本文件中？IStream中可能是二进制数据，直接写到文件里面文件就不是文本了。如果一定要保存为文本，可以将Istream->Read返回的二进制数据用Base64编码成ASCII字符，然后再写到文本文件中。
