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Tuts 4 You

Loading a DLL from Memory

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Teddy Rogers

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The default windows API functions to load external libraries into a program (LoadLibrary, LoadLibraryEx) only work with files on the filesystem. It's therefore impossible to load a DLL from memory. But sometimes, you need exactly this functionality (e.g. you don't want to distribute a lot of files or want to make disassembling harder). Common workarounds for this problems are to write the DLL into a temporary file first and import it from there. When the program terminates, the temporary file gets deleted.

In this tutorial, I will describe first, how DLL files are structured and will present some code that can be used to load a DLL completely from memory - without storing on the disk first.

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