set PROJ_LIB on Windows

rblazek · rblazek · commit 9b03b9fc25e1 · 2006-05-08T15:04:51.000Z
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5428 c8812cc2-4d05-0410-92ff-de0c093fc19c
diff --git a/src/gui/qgscoordinatetransform.cpp b/src/gui/qgscoordinatetransform.cpp
@@ -24,15 +24,21 @@
 
 // Qt4-only includes to go here
 #include <QTextOStream>
+#include <QApplication>
+#include <QFile>
+
+bool QgsCoordinateTransform::environmentSet = false;
 
 QgsCoordinateTransform::QgsCoordinateTransform( ) : QObject(), mSourceSRS(), mDestSRS()
 
 {
+    setEnvironment();
 }
 
 QgsCoordinateTransform::QgsCoordinateTransform(const QgsSpatialRefSys& source, 
                                                const QgsSpatialRefSys& dest)
 {
+    setEnvironment();
   mSourceSRS = source;
   mDestSRS = dest;
   initialise();
@@ -42,6 +48,7 @@ QgsCoordinateTransform::QgsCoordinateTransform(const QgsSpatialRefSys& source,
 QgsCoordinateTransform::QgsCoordinateTransform( QString theSourceSRS, QString theDestSRS ) : QObject()
 
 {
+    setEnvironment();
   mSourceSRS.createFromWkt(theSourceSRS);
   mDestSRS.createFromWkt(theDestSRS);
   // initialize the coordinate system data structures
@@ -55,6 +62,7 @@ QgsCoordinateTransform::QgsCoordinateTransform(long theSourceSrid,
     QString theDestWKT,
     QgsSpatialRefSys::SRS_TYPE theSourceSRSType): QObject()
 {
+    setEnvironment();
 
   mSourceSRS.createFromId(theSourceSrid, theSourceSRSType);
   mDestSRS.createFromWkt(theDestWKT);
@@ -527,3 +535,43 @@ bool QgsCoordinateTransform::writeXML( QDomNode & theNode, QDomDocument & theDoc
 
   return true;
 }
+
+void QgsCoordinateTransform::setEnvironment()
+{
+#ifdef WIN32
+    if ( environmentSet ) return;
+
+    bool set = false;
+
+    QString proj = getenv("PROJ_LIB");
+   
+    // Attention! It should be possible to set PROJ_LIB
+    // but it can happen that it was previously set by installer
+    // (version 0.7) and the old installation was deleted
+    // => test also if the directory exist
+
+    // Another problem: PROJ checks if pj_finder was set before 
+    // PROJ_LIB enviroment variable. pj_finder is probably set in 
+    // GRASS gproj library when plugin is loaded, consequently 
+    // PROJ_LIB is ignored 
+ 
+    QString proj_lib = getenv("PROJ_LIB");
+    if ( proj_lib.length() > 0 )
+    {
+         if ( QFile::exists ( proj_lib ) )
+         {
+             set = true;
+         }
+    }
+   
+    if ( !set )
+    {
+        QString var = "PROJ_LIB=" + QApplication::applicationDirPath() + "/share/proj/";
+        char *varChar = new char[var.length()+1];
+        strcpy ( varChar, const_cast<char *>(var.ascii()) );
+        putenv( varChar );
+    }
+
+    environmentSet = true; 
+#endif
+}
diff --git a/src/gui/qgscoordinatetransform.h b/src/gui/qgscoordinatetransform.h
@@ -250,6 +250,12 @@ class QgsCoordinateTransform: public QObject
      * Proj4 data structure of the destination projection (map canvas coordinate system)
      */
     projPJ mDestinationProjection;
+
+    /*!
+     * Set enviroment variable PROJ_LIB on Windows if not set.
+     */
+    void setEnvironment();
+    static bool environmentSet;
 };
 
 //! Output stream operator
