SectionAlignment in VB.NET

Encoder PDF417 in VB.NET SectionAlignment

40 42 44 46 48 50 52 56

2 2 2 2 2 2 4 4

MajorOperatingSystemVersion MinorOperatingSystemVersion MajorImageVersion MinorImageVersion MajorSubsystemVersion MinorSubsystemVersion Win32VersionValue SizeOfImage

Offset 32/64

Size 32/64

Sum of the sizes of the MS-DOS header and stub, the COFF header, the PE header, and the section headers, rounded up to a multiple of the FileAlignment value. Checksum of the disk image file. User interface subsystem required to run this image file. The values are defined in Winnt.h and are as follows: NATIVE (1): No subsystem required (for example, a device driver). WINDOWS_GUI (2): Runs in the Windows GUI subsystem. WINDOWS_CUI (3): Runs in Windows console mode. OS2_CUI (5): Runs in OS/2 1.x console mode. POSIX_CUI (7): Runs in POSIX console mode. NATIVE_WINDOWS (8): The image file is a native Win9x driver. WINDOWS_CE_GUI (9): Runs in the Windows CE GUI subsystem. In ILAsm, this field can be specified explicitly by the directive .subsystem <integer value> and/or the command-line option /SUBSYSTEM=<integer value>. The command-line option takes precedence over the directive. In managed files of v1.0, always set to 0. In managed files of v1.1 and later, always set to 0x400: no unmanaged Windows structural exception handling. Size of virtual memory to reserve for the initial thread s stack. Only the SizeOfStackCommit field is committed; the rest is available in one-page increments. The default is 1MB for 32-bit images and 4MB for 64-bit images. In ILAsm, this field can be specified explicitly by the directive .stackreserve <integer value> and/or the command-line option /STACK=<integer value>. The command-line option takes precedence over the directive. Size of virtual memory initially committed for the initial thread s stack. The default is one page (4KB) for 32-bit images and 16KB for 64-bit images. Size of virtual memory to reserve for the initial process heap. Only the SizeOfHeapCommit field is committed; the rest is available in one-page increments. The default is 1MB for both 32-bit and 64bit images.

64 68

76/80

80/88

Offset 32/64

84/96

Size 32/64

Size of virtual memory initially committed for the process heap. The default is 4KB (one operating system memory page) for 32-bit images and 2KB for 64-bit images. Obsolete, set to 0. Number of entries in the DataDirectory array; at least 16. Although it is theoretically possible to emit more than 16 data directories, all existing managed compilers emit exactly 16 data directories, with the 16th (last) data directory never used (reserved).

88/ 104 92/ 108

The data directory table starts at offset 96 in a 32-bit PE header and at offset 112 in a 64-bit PE header. Each entry in the data directory table contains the RVA and size of a table or a string that this particular directory entry describes; this information is used by the operating system. The data directory table entry is an 8-byte structure defined in Winnt.h as follows: typedef struct _IMAGE_DATA_DIRECTORY { DWORD VirtualAddress; DWORD Size; } IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY; The first field, named VirtualAddress, is, however, not a virtual address but rather an RVA. The RVAs given in this table do not necessarily point to the beginning of a section, and the sections containing specific tables do not necessarily have specific names. The second field is the size in bytes. Sixteen standard data directories are defined in the data directory table: [0] Export Directory table address and size: The Export Directory table contains information about four other tables, which hold data describing unmanaged exports of the PE file. Among managed compilers, only the VC++ linker and ILAsm are capable of exposing the managed methods exported by a managed PE file as unmanaged exports, to be consumed by an unmanaged caller. See 18 for details. [1] Import table address and size: This table contains data on unmanaged imports consumed by the PE file. Among managed compilers, only the VC++ linker make nontrivial use of this table, importing the unmanaged external functions used in the unmanaged native code that is embedded within the current, managed PE file. Other compilers, including the IL assembler, do not embed the unmanaged native code in the managed PE files, so Import tables of the files produced by these compilers contain a single entry, that of the CLR entry function. [2] Resource table address and size: This table contains unmanaged resources embedded in the PE file; managed resources aren t part of this data.