CODEWITHSUNDEEP
commemory-mapped-filesifilteripersistfile
mafu
mafu

Reputation: 32680

How can I load an IPersistFile from memory?

I'm using IPersistFile in C# to load a file, before reading it as an IFilter:

IFilter filter = LoadIFilter (fileextension);
IPersistFile persistFile = (filter as IPersistFile);
if (persistFile != null) {
    persistFile.Load (fileName, 0);
    IFILTER_FLAGS flags;
    IFILTER_INIT iflags = IFILTER_INIT.FILTER_OWNED_VALUE_OK;
    if (filter.Init (iflags, 0, IntPtr.Zero, out flags) == IFilterReturnCode.S_OK) {
        return filter; // will be read using GetChunk/GetText
    }
}

This works fine.

However, I would like to load the file contents from memory instead of a disk path. Is that possible? The IPersistFile interface does not show any other way than providing a path string, so it seems neither a memory mapped file nor a byte array can be used.

Upvotes: 2

Views: 1180

Answers (1)

mafu
mafu

Reputation: 32680

As a preleminary answer sketch: My research indicates that it might be possible to cast to IPersistStream instead of IPersistFile, which allows loading from an IStream and thus from a memory target.

Upvotes: 1

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