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如何将C/C++程序转译成Delphi(八)

王朝delphi·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

3.6. Structures, Records

3.6.1. Simple Structures

C structures are similar to records in Delphi. Structures are usually defined with the typedef keyword, but it's also possible to do it with #define.

The format of a structure declaration is

{Struct|Union} [OptIdentifier] [TagName]

{ FieldDefinitions [; ...]}

[Name [...]]

You can ignore the TagName. It's used in C for subsequent references to the structure.

This is how the fields within a structure are defined:

#define RASENTRYNAMEA struct tagRASENTRYNAMEA

RASENTRYNAMEA

{

DWORD dwSize;

CHAR szEntryName[ RAS_MaxEntryName + 1 ];

};

This C declaration defines a record (structure) named RASENTRYNAMEA. The Delphi-style name would be TRASENTRYNAMEA. This structure contains two fields: the first is named dwSize and has the type DWord. The second field is an array of char with RAS_MaxEntryName + 1 elements.

The Delphi translation:

TYPE

PRASEntryName = ^TRASEntryName

TRASEntryName = Record

dwSize : DWORD;

szEntryName : Array [0..RAS_MaxEntryName] of Char

end

Remember, you may not declare the array of char with a range from 0 to RAS_MaxEntryName+1. The reason is, that in C the number of elements is specified, but in Delphi the range of elements. Read more in the chapters about Arrays and Strings.

Back to contents --

Back to contents

3.6.2 Unions in Structures

C unions in structures are comparable to variant parts of records in Delphi. Blocks declared in a union structure are not consecutive but overlaid.

typedef struct _PROCESS_HEAP_ENTRY {

PVOID lpData;

DWORD cbData;

BYTE cbOverhead;

BYTE iRegionIndex;

WORD wFlags;

union {

struct {

HANDLE hMem;

DWORD dwReserved[ 3 ];

} Block;

struct {

DWORD dwCommittedSize;

DWORD dwUnCommittedSize;

LPVOID lpFirstBlock;

LPVOID lpLastBlock;

} Region;

};

} PROCESS_HEAP_ENTRY, *LPPROCESS_HEAP_ENTRY, *PPROCESS_HEAP_ENTRY;

This is the translation into Delphi:

type

PProcessHeapEntry = ^TProcessHeapEntry;

TProcessHeapEntry = Record

lpData: Pointer;

cbData: DWord;

cbOverhead: Byte;

iRegionIndex: Byte;

wFlags: Word;

case Integer of

0: (Block: Record

hMem: Thandle

Reserved : Array [0..2] of DWord;

end);

1: (Region: Record

dwCommittedSize: DWord;

dwUnCommittedSize: DWord;

lpFirstBlock: Pointer;

lpLastBlock: Pointer

end);

end;

 
 
 
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