Hello,
i'm currently working with Sytem.Runtime.InteropServices and i've a
problem with the marshalling between managed and unmanaged code.
I created a file called APIWin32.cs and declared the various structs
needed to use MapAndLoad method (the code is at the end of this mail).
When i try to use MapAndLoad from another type, it works fine, but
when i use PtrToStructure method it throws a System.TypeLoadException
and reports that it can't marshal OptionalHeader field in
IMAGE_NT_HEADERS type because the type definition of the field has no
layout information :
if(APIWin32.MapAndLoad(fileName,pathTo, ref loadedImage,false,true)){
IntPtr ptr =loadedImage.FileHeader;
IMAGE_NT_HEADERS imageNTHeaders =
(IMAGE_NT_HEADERS)Marshal.PtrToStructure(ptr,typeof(IMAGE_NT_HEADERS));
...
}
I found out that this only happens when the last member of
the IMAGE_OPTIONAL_HEADER type is declared, it represents an array of structs (
public IMAGE_DATA_DIRECTORY [] DataDirectory;).
I know that this code is not complete for working with 64 bits PE
files... but i'm only trying to get this to work first.
Could anyone please explain me the correct way of marshalling an array
of structs? thanks
Here is the code i'm using:
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_DATA_DIRECTORY
{
public UInt32 VirtualAddress;
public UInt32 Size;
}
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_OPTIONAL_HEADER
{
public UInt16 Magic;
public Byte MajorLinkerVersion;
public Byte MinorLinkerVersion;
public UInt32 SizeOfCode;
public UInt32 SizeOfInitializedData;
public UInt32 SizeOfUninitializedData;
public UInt32 AddressOfEntryPoint;
public UInt32 BaseOfCode;
public UInt32 BaseOfData;
public UInt32 ImageBase;//UInt32
public UInt32 SectionAlignment;
public UInt32 FileAlignment;
public UInt16 MajorOperatingSystemVersion;
public UInt16 MinorOperatingSystemVersion;
public UInt16 MajorImageVersion;
public UInt16 MinorImageVersion;
public UInt16 MajorSubsystemVersion;
public UInt16 MinorSubsystemVersion;
public UInt32 Win32VersionValue;
public UInt32 SizeOfImage;
public UInt32 SizeOfHeaders;
public UInt32 CheckSum;
public UInt16 Subsystem;
public UInt16 DllCharacteristics;
public UInt32 SizeOfStackReserve;//UInt32
public UInt32 SizeOfStackCommit;//UInt32
public UInt32 SizeOfHeapReserve;//UInt32
public UInt32 SizeOfHeapCommit;//UInt32
public UInt32 LoaderFlags;
public UInt32 NumberOfRvaAndSizes;
[MarshalAs(UnmanagedType.ByValArray,SizeConst=16,ArraySubType=UnmanagedType.Struct)]
public IMAGE_DATA_DIRECTORY [] DataDirectory;
}
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_FILE_HEADER {
public UInt16 Machine;
public UInt16 NumberOfSections;
public UInt32 TimeDateStamp;
public UInt32 PointerToSymbolTable;
public UInt32 NumberOfSymbols;
public UInt16 SizeOfOptionalHeader;
public UInt16 Characteristics;
}
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_NT_HEADERS
{
public UInt32 Signature;
public IMAGE_FILE_HEADER FileHeader; //IMAGE_FILE_HEADER
public IMAGE_OPTIONAL_HEADER OptionalHeader;//IMAGE_OPTIONAL_HEADER
}
[StructLayout(LayoutKind.Sequential)]
public struct LOADED_IMAGE
{
public String ModuleName; //PSTR
public IntPtr hFile; //handle
public byte MappedAddress; //puchar
#if IMAGEHLP64
public IntPtr FileHeader; //PIMAGE_NT_HEADERS64
#else
PIMAGE_NT_HEADERS32 FileHeader;
#endif
public IntPtr LastRvaSection; //PIMAGE_SECTION_HEADER
public UInt32 NumberOfSections;//ULONG
public IntPtr Sections;//PIMAGE_SECTION_HEADER
public UInt32 Characteristics;//ULONG
public bool fSystemImage;
public bool fDOSImage;
public IntPtr Links;//LIST_ENTRY
public UInt32 SizeOfImage;//ULONG
}
public class Win32
{
[DllImport("imagehlp.dll")]
public static extern bool MapAndLoad(
string ImageName,
string DllPath,
ref LOADED_IMAGE LoadedImage, //PLOADED_IMAGE
bool DotDll,
bool ReadOnly
);
...
}
--
Best regards,
Bruno mailto:[EMAIL PROTECTED]
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