QGIS API Documentation  3.9.0-Master (3ff8ca5736)
Functions | Variables
qgis.cpp File Reference
#include "qgis.h"
#include "qgsversion.h"
#include <QCoreApplication>
#include <QColor>
#include <QDate>
#include <QTime>
#include <QLocale>
#include <QDateTime>
#include "qgsconfig.h"
#include "qgslogger.h"
#include "qgswkbtypes.h"
#include <gdal.h>
#include <ogr_api.h>
Include dependency graph for qgis.cpp:

Go to the source code of this file.

Functions

void * qgsCalloc (size_t nmemb, size_t size)
 Allocates memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated memory. More...
 
void qgsFree (void *ptr)
 Frees the memory space pointed to by ptr. More...
 
void * qgsMalloc (size_t size)
 Allocates size bytes and returns a pointer to the allocated memory. More...
 
double qgsPermissiveToDouble (QString string, bool &ok)
 Converts a string to a double in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators. More...
 
int qgsPermissiveToInt (QString string, bool &ok)
 Converts a string to an integer in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators. More...
 
qlonglong qgsPermissiveToLongLong (QString string, bool &ok)
 Converts a string to an qlonglong in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators. More...
 
bool qgsVariantEqual (const QVariant &lhs, const QVariant &rhs)
 Compares two QVariant values and returns whether they are equal, two NULL values are always treated as equal and 0 is not treated as equal with NULL. More...
 
bool qgsVariantGreaterThan (const QVariant &lhs, const QVariant &rhs)
 Compares two QVariant values and returns whether the first is greater than the second. More...
 
bool qgsVariantLessThan (const QVariant &lhs, const QVariant &rhs)
 Compares two QVariant values and returns whether the first is less than the second. More...
 
QString qgsVsiPrefix (const QString &path)
 
uint qHash (const QVariant &variant)
 Hash for QVariant. More...
 

Variables

const QString GEO_EPSG_CRS_AUTHID = QStringLiteral( "EPSG:4326" )
 Geographic coord sys from EPSG authority. More...
 
const QString GEO_NONE = QStringLiteral( "NONE" )
 Constant that holds the string representation for "No ellips/No CRS". More...
 
const QString GEOPROJ4 = QStringLiteral( "+proj=longlat +datum=WGS84 +no_defs" )
 PROJ4 string that represents a geographic coord sys. More...
 
const QString GEOWKT
 Wkt string that represents a geographic coord sys. More...
 
const QString PROJECT_SCALES
 

Function Documentation

◆ qgsCalloc()

void* qgsCalloc ( size_t  nmemb,
size_t  size 
)

Allocates memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated memory.

Works like C calloc() but prints debug message by QgsLogger if allocation fails.

Parameters
nmembnumber of elements
sizesize of element in bytes

Definition at line 134 of file qgis.cpp.

◆ qgsFree()

void qgsFree ( void *  ptr)

Frees the memory space pointed to by ptr.

Works like C free().

Parameters
ptrpointer to memory space

Definition at line 149 of file qgis.cpp.

◆ qgsMalloc()

void* qgsMalloc ( size_t  size)

Allocates size bytes and returns a pointer to the allocated memory.

Works like C malloc() but prints debug message by QgsLogger if allocation fails.

Parameters
sizesize in bytes

Definition at line 119 of file qgis.cpp.

◆ qgsPermissiveToDouble()

double qgsPermissiveToDouble ( QString  string,
bool &  ok 
)

Converts a string to a double in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters
stringstring to convert
okwill be set to true if conversion was successful
Returns
string converted to double if possible
See also
permissiveToInt
Since
QGIS 2.9

Definition at line 98 of file qgis.cpp.

◆ qgsPermissiveToInt()

int qgsPermissiveToInt ( QString  string,
bool &  ok 
)

Converts a string to an integer in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters
stringstring to convert
okwill be set to true if conversion was successful
Returns
string converted to int if possible
See also
permissiveToDouble
Since
QGIS 2.9

Definition at line 105 of file qgis.cpp.

◆ qgsPermissiveToLongLong()

qlonglong qgsPermissiveToLongLong ( QString  string,
bool &  ok 
)

Converts a string to an qlonglong in a permissive way, e.g., allowing for incorrect numbers of digits between thousand separators.

Parameters
stringstring to convert
okwill be set to true if conversion was successful
Returns
string converted to int if possible
See also
permissiveToInt
Since
QGIS 3.4

Definition at line 112 of file qgis.cpp.

◆ qgsVariantEqual()

bool qgsVariantEqual ( const QVariant &  lhs,
const QVariant &  rhs 
)

Compares two QVariant values and returns whether they are equal, two NULL values are always treated as equal and 0 is not treated as equal with NULL.

Parameters
lhsfirst value
rhssecond value
Returns
true if values are equal

Definition at line 298 of file qgis.cpp.

◆ qgsVariantGreaterThan()

bool qgsVariantGreaterThan ( const QVariant &  lhs,
const QVariant &  rhs 
)

Compares two QVariant values and returns whether the first is greater than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

See also
qgsVariantLessThan()

Definition at line 222 of file qgis.cpp.

◆ qgsVariantLessThan()

bool qgsVariantLessThan ( const QVariant &  lhs,
const QVariant &  rhs 
)

Compares two QVariant values and returns whether the first is less than the second.

Useful for sorting lists of variants, correctly handling sorting of the various QVariant data types (such as strings, numeric values, dates and times)

Invalid < NULL < Values

See also
qgsVariantGreaterThan()

Definition at line 154 of file qgis.cpp.

◆ qgsVsiPrefix()

QString qgsVsiPrefix ( const QString &  path)

Definition at line 227 of file qgis.cpp.

◆ qHash()

uint qHash ( const QVariant &  variant)

Hash for QVariant.

Definition at line 252 of file qgis.cpp.

Variable Documentation

◆ GEO_EPSG_CRS_AUTHID

const QString GEO_EPSG_CRS_AUTHID = QStringLiteral( "EPSG:4326" )

Geographic coord sys from EPSG authority.

Definition at line 70 of file qgis.cpp.

◆ GEO_NONE

const QString GEO_NONE = QStringLiteral( "NONE" )

Constant that holds the string representation for "No ellips/No CRS".

Definition at line 72 of file qgis.cpp.

◆ GEOPROJ4

const QString GEOPROJ4 = QStringLiteral( "+proj=longlat +datum=WGS84 +no_defs" )

PROJ4 string that represents a geographic coord sys.

Definition at line 51 of file qgis.cpp.

◆ GEOWKT

const QString GEOWKT
Initial value:
=
"GEOGCS[\"WGS 84\", "
" DATUM[\"WGS_1984\", "
" SPHEROID[\"WGS 84\",6378137,298.257223563, "
" AUTHORITY[\"EPSG\",\"7030\"]], "
" TOWGS84[0,0,0,0,0,0,0], "
" AUTHORITY[\"EPSG\",\"6326\"]], "
" PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]], "
" UNIT[\"DMSH\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9108\"]], "
" AXIS[\"Lat\",NORTH], "
" AXIS[\"Long\",EAST], "
" AUTHORITY[\"EPSG\",\"4326\"]]"

Wkt string that represents a geographic coord sys.

Since
QGIS GEOWkt

Definition at line 53 of file qgis.cpp.

◆ PROJECT_SCALES

const QString PROJECT_SCALES
Initial value:
=
"1:1000000,1:500000,1:250000,1:100000,1:50000,1:25000,"
"1:10000,1:5000,1:2500,1:1000,1:500"

Definition at line 66 of file qgis.cpp.