windows 如何获取IStream的长度？C++
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How to get the length of IStream? C++
提问by Schwertz
I'm creating an IStream as follow:
我正在创建一个 IStream 如下：
IStream* stream;
result = CreateStreamOnHGlobal(0, TRUE, &stream);
Then I have a CImage object that I save to this stream:
然后我有一个保存到这个流的 CImage 对象：
image->Save(stream, Gdiplus::ImageFormatBMP);
I need to get the size of bytes written to this IStream.
我需要获取写入此 IStream 的字节大小。
How can I do this?
我怎样才能做到这一点？
There is no Length or something like this in the IStream...
IStream 中没有 Length 或类似的东西......
thanks!
谢谢！
回答by Christopher
IStream::Statshould do what you want.
IStream::Stat应该做你想做的。
回答by Harald Deischinger
Or you can use:
或者你可以使用：
ULARGE_INTEGER liSize;
IStream_Size(pStream, &liSize);
other functions you might find useful in this context:
在这种情况下，您可能会发现其他有用的功能：
IStream_Reset(pStream); // reset seek position to beginning
IStream_Read(pStream, mem, size);
