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{
/******************************************************************************
*
* Project: Shapelib
* Purpose: Delphi Pascal interface to Shapelib.
* Author: Kevin Meyer (Kevin@CyberTracker.co.za)
*
******************************************************************************
* Copyright (c) 2002, Keven Meyer (Kevin@CyberTracker.co.za)
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************
*
*/
}
unit ShapeFileII;
interface
//uses { uses clause }
// ;
{ Set compiler to pack on byte boundaries only }
{$ALIGN OFF}
{$OVERFLOWCHECKS OFF}
{$J-}
const
SHPT_NULL = 0;
SHPT_POINT = 1;
SHPT_ARC = 3;
SHPT_POLYGON = 5;
SHPT_MULTIPOINT = 8;
SHPT_POINTZ = 11;
SHPT_ARCZ = 13;
SHPT_POLYGONZ = 15;
SHPT_MULTIPOINTZ = 18;
SHPT_POINTM = 21;
SHPT_ARCM = 23;
SHPT_POLYGONM = 25;
SHPT_MULTIPOINTM = 28;
SHPT_MULTIPATCH = 31;
XBASE_FLDHDR_SZ = 32;
szAccessBRW = 'rb+';
// *********************** SHP support ************************
type
SHPObject = record
nSHPType,
nShapeId,
nParts : LongWord;
panPartStart,
panPartType : array of LongWord;
nVertices : LongWord;
padfX, padfY, padfZ, padfM : array of double;
dfXMin, dfYMin, dfZMin, dfMMin : double;
dfXMax, dfYMax, dfZMax, dfMMax : double;
end;
SHPObjectHandle = ^SHPObject;
SHPBoundsArr = double;
SHPInfo = record
fpSHP,
fpSHX : integer;
nShapeType,
nFileSize,
nRecords,
nMaxRecords : LongWord;
panRecOffset,
panRecSize : array of LongWord;
adBoundsMin, adBoundsMax : SHPBoundsArr;
bUpdated : LongWord;
end;
SHPHandle = ^SHPInfo;
// *********************** DBF support ************************
DBFInfo = record
fp : FILE;
nRecords,
nRecordLength,
nHeaderLength,
nFields : LongWord;
panFieldOffset,
panFieldSize,
panFieldDecimals : array of LongWord;
pachFieldType : LongWord;
pszHeader : PChar;
nCurrentRecord,
bCurrentRecordModified : LongWord;
pszCurrentRecord : PChar;
bNoHeader,
bUpdated : LongWord;
end;
DBFHandle = ^DBFInfo;
DBFFieldType = (DBFTString, DBFTInteger, DBFTDouble, DBFTInvalid) ;
// *********************** SHP func declarations ************************
{$ALIGN ON}
function SHPOpen(pszShapeFile, pszAccess : PChar) : SHPHandle;cdecl;
procedure SHPGetInfo(hSHP : SHPHandle; var pnEntities, pnShapeType : LongWord; var padfMinBoud, padfMaxBound : SHPBoundsArr);cdecl;
procedure SHPClose(hSHP : SHPHandle);cdecl;
function SHPReadObject(hSHP : SHPHandle; iShape : LongWord): SHPObjectHandle;cdecl;
function SHPCreate(pszShapeFile : PChar; nShapeType : LongWord):SHPHandle;cdecl;
function SHPWriteObject(hSHP : SHPHandle; iShape : LongWord; psObject : SHPObjectHandle): LongWord;cdecl;
function SHPCreateSimpleObject(nSHPType, nVertices : LongWord; var padfX, padfY, padfZ : double):SHPObjectHandle;cdecl;
procedure SHPDestroy(psObject : SHPObjectHandle);cdecl;
procedure SHPComputeExtents(psObject : SHPObjectHandle);cdecl;
function SHPCreateObject(nSHPType, iShape, nParts : LongWord; var panPartStart, panPartType : LongWord; nVertices : LongWord; var padfX, padfY, padfZ, padfM : SHPBoundsArr): SHPObjectHandle;cdecl;
function SHPTypeStr(pnShapeType : LongWord): string;
// *********************** DBF func declarations ************************
function DBFOpen(pszDBFFile, pszAccess : PChar): DBFHandle;cdecl;
function DBFCreate(pszDBFFile : PChar): DBFHandle ;cdecl;
function DBFGetFieldCount(hDBF : DBFHandle) : LongWord ;cdecl;
function DBFGetRecordCount(hDBF : DBFHandle) : LongWord;cdecl;
function DBFGetFieldIndex(hDBF: DBFHandle; pszFieldName : PChar): LongWord;cdecl;
function DBFGetFieldInfo(hDBF : DBFHandle; iField : LongWord; pszFieldName : PChar;
var pnWidth, pnDecimals : LongWord): DBFFieldType;cdecl;
function DBFAddField(hDBF : DBFHandle; pszFieldName : PChar;
eType : DBFFieldType; nWidth, nDecimals : LongWord): LongWord;cdecl;
function DBFReadIntegerAttribute(hDBF : DBFHandle;iShape, iField : LongWord ): LongWord;cdecl;
function DBFReadDoubleAttribute(hDBF : DBFHandle; iShape, iField : LongWord ):double;cdecl;
function DBFReadStringAttribute(hDBF : DBFHandle; iShape, iField : LongWord ) : pchar;cdecl;
function DBFIsAttributeNULL(hDBF : DBFHandle; iShape, iField : LongWord ): LongWord;cdecl;
function DBFWriteIntegerAttribute(hDBF : DBFHandle;iShape, iField, nFieldValue : LongWord): LongWord;cdecl;
function DBFWriteDoubleAttribute(hDBF : DBFHandle;iShape, iField : LongWord;
dFieldValue : double): LongWord ;cdecl;
function DBFWriteStringAttribute(hDBF : DBFHandle;iShape, iField : LongWord;
pszFieldValue : PChar): LongWord ;cdecl;
function DBFWriteNULLAttribute(hDBF : DBFHandle; iShape, iField : LongWord ) : LongWord;cdecl;
procedure DBFClose(hDBF : DBFHandle);cdecl;
function DBFGetNativeFieldType(hDBF : DBFHandle; iField : LongWord) : Char;cdecl;
// *********************** SHP implementation ************************
implementation
// *****************************************************************************
function SHPCreateSimpleObject(nSHPType, nVertices : LongWord; var padfX, padfY, padfZ : double):SHPObjectHandle;external 'shapelib.dll' name 'SHPCreateSimpleObject';
function SHPOpen(pszShapeFile, pszAccess : PChar) : SHPHandle; external 'shapelib.dll' name 'SHPOpen';
procedure SHPGetInfo(hSHP : SHPHandle; var pnEntities, pnShapeType : LongWord; var padfMinBoud, padfMaxBound : SHPBoundsArr);external 'shapelib.dll' name 'SHPGetInfo';
procedure SHPClose(hSHP : SHPHandle);external 'shapelib.dll' name 'SHPClose';
function SHPReadObject(hSHP : SHPHandle; iShape : LongWord) : SHPObjectHandle;external 'shapelib.dll' name 'SHPReadObject';
function SHPCreate(pszShapeFile : PChar; nShapeType : LongWord):SHPHandle;external 'shapelib.dll' name 'SHPCreate';
function SHPWriteObject(hSHP : SHPHandle; iShape : LongWord; psObject : SHPObjectHandle): LongWord;cdecl;external 'shapelib.dll' name 'SHPWriteObject';
procedure SHPDestroy(psObject : SHPObjectHandle);external 'shapelib.dll' name 'SHPDestroyObject';
procedure SHPComputeExtents(psObject : SHPObjectHandle);external 'shapelib.dll' name 'SHPComputeExtents';
function SHPCreateObject(nSHPType, iShape, nParts : LongWord; var panPartStart, panPartType : LongWord; nVertices : LongWord; var padfX, padfY, padfZ, padfM : SHPBoundsArr): SHPObjectHandle;external 'shapelib.dll' name 'SHPCreateObject';
// *****************************************************************************
function SHPTypeStr(pnShapeType : LongWord): string;
begin
case pnShapeType of
SHPT_NULL : result := 'NULL';
SHPT_POINT : result := 'POINT';
SHPT_ARC : result := 'ARC';
SHPT_POLYGON : result := 'POLYGON';
SHPT_MULTIPOINT : result := 'MULTIPOINT';
SHPT_POINTZ : result := 'POINTZ';
SHPT_ARCZ : result := 'ARCZ';
SHPT_POLYGONZ : result := 'POLYGONZ';
SHPT_MULTIPOINTZ : result := 'MULTIPOINTZ';
SHPT_POINTM : result := 'POINTM';
SHPT_ARCM : result := 'ARCM';
SHPT_POLYGONM : result := 'POLYGONM';
SHPT_MULTIPOINTM : result := 'MULTIPOINTM';
SHPT_MULTIPATCH : result := 'MULTIPATCH';
else
result := '--unknown--';
end;
end;
// *****************************************************************************
// *****************************************************************************
function DBFOpen(pszDBFFile, pszAccess : PChar): DBFHandle;external 'shapelib.dll';
function DBFCreate(pszDBFFile : PChar): DBFHandle ;external 'shapelib.dll';
function DBFGetFieldCount(hDBF : DBFHandle) : LongWord ;external 'shapelib.dll';
function DBFGetRecordCount(hDBF : DBFHandle) : LongWord;external 'shapelib.dll';
function DBFGetFieldIndex(hDBF: DBFHandle; pszFieldName : PChar): LongWord;external 'shapelib.dll';
function DBFGetFieldInfo(hDBF : DBFHandle; iField : LongWord; pszFieldName : PChar; var pnWidth, pnDecimals : LongWord): DBFFieldType;external 'shapelib.dll';
function DBFAddField(hDBF : DBFHandle; pszFieldName : PChar; eType : DBFFieldType; nWidth, nDecimals : LongWord): LongWord;external 'shapelib.dll';
function DBFReadIntegerAttribute(hDBF : DBFHandle;iShape, iField : LongWord ): LongWord;external 'shapelib.dll';
function DBFReadDoubleAttribute(hDBF : DBFHandle; iShape, iField : LongWord ):double;external 'shapelib.dll';
function DBFReadStringAttribute(hDBF : DBFHandle; iShape, iField : LongWord ) : pchar;external 'shapelib.dll';
function DBFIsAttributeNULL(hDBF : DBFHandle; iShape, iField : LongWord ): LongWord;external 'shapelib.dll';
function DBFWriteIntegerAttribute(hDBF : DBFHandle;iShape, iField, nFieldValue : LongWord): LongWord;external 'shapelib.dll';
function DBFWriteDoubleAttribute(hDBF : DBFHandle;iShape, iField : LongWord; dFieldValue : double): LongWord ;external 'shapelib.dll';
function DBFWriteStringAttribute(hDBF : DBFHandle;iShape, iField : LongWord; pszFieldValue : PChar): LongWord ;external 'shapelib.dll';
function DBFWriteNULLAttribute(hDBF : DBFHandle; iShape, iField : LongWord ) : LongWord;external 'shapelib.dll';
procedure DBFClose(hDBF : DBFHandle);external 'shapelib.dll';
function DBFGetNativeFieldType(hDBF : DBFHandle; iField : LongWord) : Char;external 'shapelib.dll';
// *****************************************************************************
end.
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