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PE (portable executable) header flags (Delphi)

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Type

Flag

Syntax

{$SetPEFlags <integer expression>} {$SetPEOptFlags <integer expression>}

Scope

Local



Microsoft relies on PE (portable executable) header flags to allow an application to indicate compatiblity with OS services or request advanced OS services. These directives provide powerful options for tuning your applications on high-end NT systems.

Warning: Checking or masking bit values specified by these directives is not an error. Then again, if you set the wrong combination of bits, you could corrupt your executable file.

These directives allow you to set flag bits in the PE file header's Characteristics field and PE file optional header's DLLCharacteristics field, respectively. Most of the Characteristics flags, set using $SetPEFlags, are specifically for object files and libraries. DLLCharacteristics, set using $SetPEOptFlags, are flags that describe when to call a DLL's entry point.

The <integer expression> in these directives can include Delphi constant identifiers, such as the IMAGE_FILE_xxxx constants defined in Windows.pas. Multiple constants should be OR'd together.

The following table lists some of the header flags you can set, using SetPEFlags or SetPEOptFlags.

Name Description

IMAGE_FILE_RELOCS_STRIPPED

Relocation information is stripped from file.

IMAGE_FILE_EXECUTABLE_IMAGE

File is executable (i.e. no unresolved external references).

IMAGE_FILE_LINE_NUMS_STRIPPED

Line numbers are stripped from file.

IMAGE_FILE_LOCAL_SYMS_STRIPPED

Local symbols are stripped from file.

IMAGE_FILE_AGGRESIVE_WS_TRIM

Agressively trim working set.

IMAGE_FILE_LARGE_ADDRESS_AWARE

Application can handle addresses larger than 2 GB.

IMAGE_FILE_BYTES_REVERSED_LO

Bytes of machine word are reversed.

IMAGE_FILE_32BIT_MACHINE

32 bit word machine.

IMAGE_FILE_DEBUG_STRIPPED

Debugging info is stripped from file in .DBG file.

IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP

If Image is on removable media, copy and run from the swap file.

IMAGE_FILE_NET_RUN_FROM_SWAP

If Image is on Net, copy and run from the swap file.

IMAGE_FILE_SYSTEM

System File.

IMAGE_FILE_DLL

The file is a DLL.

IMAGE_FILE_UP_SYSTEM_ONLY

File should only be run on a UP machine.

IMAGE_FILE_BYTES_REVERSED_HI

Bytes of machine word are reversed.

IMAGE_FILE_MACHINE_UNKNOWN

Unknown machine.

IMAGE_FILE_MACHINE_I386

Intel 386.

IMAGE_FILE_MACHINE_R3000

MIPS Little-Endian, 0x160 big-endian.

IMAGE_FILE_MACHINE_R4000

MIPS Little-Endian.

IMAGE_FILE_MACHINE_R10000

MIPS Little-Endian.

IMAGE_FILE_MACHINE_ALPHA

Alpha_AXP.

IMAGE_FILE_MACHINE_POWERPC

IBM PowerPC Little-Endian.



You can include these directives in the source code multiple times. The flag values specified by multiple directives are strictly cumulative: if the first occurrence of the directive sets $03 and the second occurrence sets $10, the value written to the executable file at link time will be $13 (plus whatever bits the linker normally sets in the PE flag fields).

These directives only affect the output file if included in source code prior to linking. This means you should place these directives in a .dpr or .dpk file, not in a regular unit. Like the exe description directive, placing these directives in unit source code is not an error. However, these directives in unit source will not affect the output file (exe or dll) unless the unit source is recompiled at the time the output file is linked.

Five options related to the PE header are available on the Project > Options > Delphi Compiler > Linking page in the IDE.

See Also

  • Project Options > Delphi Compiler > Linking page
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