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# ogr_core.h File Reference

`#include "cpl_port.h"`
`#include "gdal_version.h"`

Go to the source code of this file.

## Classes
class | OGREnvelope
union | OGRField
## Defines
#define | GDAL_CHECK_VERSION(pszCallingComponentName) GDALCheckVersion(GDAL_VERSION_MAJOR, GDAL_VERSION_MINOR, pszCallingComponentName)
## Typedefs
typedef enum ogr_style_tool_class_id | OGRSTClassId
typedef enum ogr_style_tool_units_id | OGRSTUnitId
typedef enum ogr_style_tool_param_pen_id | OGRSTPenParam
typedef enum ogr_style_tool_param_brush_id | OGRSTBrushParam
typedef enum ogr_style_tool_param_symbol_id | OGRSTSymbolParam
typedef enum ogr_style_tool_param_label_id | OGRSTLabelParam
## Enumerations
enum | OGRwkbGeometryType { wkbUnknown = 0, wkbPoint = 1, wkbLineString = 2, wkbPolygon = 3, wkbMultiPoint = 4, wkbMultiLineString = 5, wkbMultiPolygon = 6, wkbGeometryCollection = 7, wkbNone = 100, wkbLinearRing = 101, wkbPoint25D = 0x80000001, wkbLineString25D = 0x80000002, wkbPolygon25D = 0x80000003, wkbMultiPoint25D = 0x80000004, wkbMultiLineString25D = 0x80000005, wkbMultiPolygon25D = 0x80000006, wkbGeometryCollection25D = 0x80000007 }
enum | OGRFieldType { OFTInteger = 0, OFTIntegerList = 1, OFTReal = 2, OFTRealList = 3, OFTString = 4, OFTStringList = 5, OFTWideString = 6, OFTWideStringList = 7, OFTBinary = 8, OFTDate = 9, OFTTime = 10, OFTDateTime = 11 }
enum | OGRJustification
enum | ogr_style_tool_class_id
enum | ogr_style_tool_units_id
enum | ogr_style_tool_param_pen_id
enum | ogr_style_tool_param_brush_id
enum | ogr_style_tool_param_symbol_id
enum | ogr_style_tool_param_label_id
## Functions
const char * | OGRGeometryTypeToName (OGRwkbGeometryType eType)
OGRwkbGeometryType | OGRMergeGeometryTypes (OGRwkbGeometryType eMain, OGRwkbGeometryType eExtra)
int | OGRParseDate (const char *pszInput, OGRField *psOutput, int nOptions)
int CPL_STDCALL | GDALCheckVersion (int nVersionMajor, int nVersionMinor, const char *pszCallingComponentName)

## Detailed Description

Core portability services for cross-platform OGR code.

## Define Documentation

#define GDAL_CHECK_VERSION | ( | pszCallingComponentName |  | ) | GDALCheckVersion(GDAL_VERSION_MAJOR, GDAL_VERSION_MINOR, pszCallingComponentName)

Helper macro for GDALCheckVersion

## Typedef Documentation

typedef enum ogr_style_tool_param_brush_id OGRSTBrushParam

List of parameters for use with OGRStyleBrush.

typedef enum ogr_style_tool_class_id OGRSTClassId

OGRStyleTool derived class types (returned by GetType()).

typedef enum ogr_style_tool_param_label_id OGRSTLabelParam

List of parameters for use with OGRStyleLabel.

typedef enum ogr_style_tool_param_pen_id OGRSTPenParam

List of parameters for use with OGRStylePen.

typedef enum ogr_style_tool_param_symbol_id OGRSTSymbolParam

List of parameters for use with OGRStyleSymbol.

typedef enum ogr_style_tool_units_id OGRSTUnitId

List of units supported by OGRStyleTools.

## Enumeration Type Documentation

enum ogr_style_tool_class_id

OGRStyleTool derived class types (returned by GetType()).

enum ogr_style_tool_param_brush_id

List of parameters for use with OGRStyleBrush.

enum ogr_style_tool_param_label_id

List of parameters for use with OGRStyleLabel.

enum ogr_style_tool_param_pen_id

List of parameters for use with OGRStylePen.

enum ogr_style_tool_param_symbol_id

List of parameters for use with OGRStyleSymbol.

enum ogr_style_tool_units_id

List of units supported by OGRStyleTools.

enum OGRFieldType

List of feature field types. This list is likely to be extended in the future ... avoid coding applications based on the assumption that all field types can be known.

Enumerator:

  OFTInteger | Simple 32bit integer
  OFTIntegerList | List of 32bit integers
  OFTReal | Double Precision floating point
  OFTRealList | List of doubles
  OFTString | String of ASCII chars
  OFTStringList | Array of strings
  OFTWideString | deprecated
  OFTWideStringList | deprecated
  OFTBinary | Raw Binary data
  OFTDate | Date
  OFTTime | Time
  OFTDateTime | Date and Time

enum OGRJustification

Display justification for field values.

enum OGRwkbGeometryType

List of well known binary geometry types. These are used within the BLOBs but are also returned from OGRGeometry::getGeometryType() to identify the type of a geometry object.

Enumerator:

  wkbUnknown | unknown type, non-standard
  wkbPoint | 0-dimensional geometric object, standard WKB
  wkbLineString | 1-dimensional geometric object with linear interpolation between Points, standard WKB
  wkbPolygon | planar 2-dimensional geometric object defined by 1 exterior boundary and 0 or more interior boundaries, standard WKB
  wkbMultiPoint | GeometryCollection of Points, standard WKB
  wkbMultiLineString | GeometryCollection of LineStrings, standard WKB
  wkbMultiPolygon | GeometryCollection of Polygons, standard WKB
  wkbGeometryCollection | geometric object that is a collection of 1 or more geometric objects, standard WKB
  wkbNone | non-standard, for pure attribute records
  wkbLinearRing | non-standard, just for createGeometry()
  wkbPoint25D | 2.5D extension as per 99-402
  wkbLineString25D | 2.5D extension as per 99-402
  wkbPolygon25D | 2.5D extension as per 99-402
  wkbMultiPoint25D | 2.5D extension as per 99-402
  wkbMultiLineString25D | 2.5D extension as per 99-402
  wkbMultiPolygon25D | 2.5D extension as per 99-402
  wkbGeometryCollection25D | 2.5D extension as per 99-402

## Function Documentation

int CPL_STDCALL GDALCheckVersion | ( | int | nVersionMajor,
|  | int | nVersionMinor,
|  | const char * | pszCallingComponentName |
| ) |  |  |

Return TRUE if GDAL library version at runtime matches nVersionMajor.nVersionMinor.

The purpose of this method is to ensure that calling code will run with the GDAL version it is compiled for. It is primarly intented for external plugins.

Parameters:

  | nVersionMajor | Major version to be tested against
  | nVersionMinor | Minor version to be tested against
  | pszCallingComponentName | If not NULL, in case of version mismatch, the method will issue a failure mentionning the name of the calling component.

const char* OGRGeometryTypeToName | ( | OGRwkbGeometryType | eType | ) |

Fetch a human readable name corresponding to an OGRwkBGeometryType value. The returned value should not be modified, or freed by the application.

This function is C callable.

Parameters:

  | eType | the geometry type.

Returns:
  internal human readable string, or NULL on failure.

OGRwkbGeometryType OGRMergeGeometryTypes | ( | OGRwkbGeometryType | eMain,
|  | OGRwkbGeometryType | eExtra |
| ) |  |  |

Find common geometry type.

Given two geometry types, find the most specific common type. Normally used repeatedly with the geometries in a layer to try and establish the most specific geometry type that can be reported for the layer.

NOTE: wkbUnknown is the "worst case" indicating a mixture of geometry types with nothing in common but the base geometry type. wkbNone should be used to indicate that no geometries have been encountered yet, and means the first geometry encounted will establish the preliminary type.

Parameters:

  | eMain | the first input geometry type.
  | eExtra | the second input geometry type.

Returns:
  the merged geometry type.

int OGRParseDate | ( | const char * | pszInput,
|  | OGRField * | psField,
|  | int | nOptions |
| ) |  |  |

Parse date string.

This function attempts to parse a date string in a variety of formats into the OGRField.Date format suitable for use with OGR. Generally speaking this function is expecting values like:

YYYY-MM-DD HH:MM:SS+nn

The seconds may also have a decimal portion (which is ignored). And just dates (YYYY-MM-DD) or just times (HH:MM:SS) are also supported. The date may also be in YYYY/MM/DD format. If the year is less than 100 and greater than 30 a "1900" century value will be set. If it is less than 30 and greater than -1 then a "2000" century value will be set. In the future this function may be generalized, and additional control provided through nOptions, but an nOptions value of "0" should always do a reasonable default form of processing.

The value of psField will be indeterminate if the function fails (returns FALSE).

Parameters:

  | pszInput | the input date string.
  | psField | the OGRField that will be updated with the parsed result.
  | nOptions | parsing options, for now always 0.

Returns:
  TRUE if apparently successful or FALSE on failure.

Generated for GDAL by 1.5.1.