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The IDA Pro Book, 2nd Edition by Chris Eagle

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Using Structure Templates

There are two ways to make use of structure definitions in your disassemblies. First, you can reformat memory references to make them more readable by converting numeric structure offsets such as [ebx+8] into symbolic references such as [ebx+ch8_struct.field4]. The latter form provides far more information about what is being referenced. Because IDA uses a hierarchical notation, it is clear exactly what type of structure, and exactly which field within that structure, is being accessed. This technique for applying structure templates is most often used when a structure is being referenced through a pointer. The second way to use structure templates is to provide additional datatypes that can be applied to stack and global ...

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