Binary header for ipicture format code#
This is not typically nessecary, since most Windows versions will be using the PE format of executable file, but it's good practice in order to ensure your code is a bit more robust.
The third step will be to check the first member of the IMAGE_NT_HEADERS to see if it is an actual PE file, this will be defined by the Signature field of the structure, and the defined constant to test for will be IMAGE_NT_SIGNATURE.
The e_lfanew field contains a relative virtual address which you need to add to the image base you found in step one to calculate the virtual address of the IMAGE_NT_HEADERS structure. The e_magic field contains a double word for 32-bit or quadruple for 64-bit that allows you to test if the file being read or your implementation is correctly formatted with the correct value being defined as IMAGE_DOS_SIGNATURE, which is the ASCII-Z string of "MZ\0". The two fields you will need to know are the e_magic field and the e_lfanew field. Once you have completed the first step, the structure at the base address is the IMAGE_DOS_HEADER, while this is not documented on MSDN, it has two very important but cryptic fields. For more information about what a module handle is, see here. The base address will be the same as the field hModule in the MODULEENTRY32 data retrieved from the snapshot. Assuming that you are interested in doing this for a file on disk, then you may do this with the file mapping API, if you would prefer to implement this on an executable loaded into memory as a running process, you can achieve the equivalent by using the the tool help snapshot API. This step will be different depending on if the executable has or hasn't been mapped into memory, but the basic idea will be the same. The first step is to find the base address of the image loaded into memory. Here are the steps you should follow to achieve your goal. I have extensive experience with parsing the PE on Windows, mainly for use in function interception.
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