Set a suitable locale automatically to avoid issues with the ini fileHEADmaster

Change-Id: Ie988518e9411d9c704e8616dbb513ef7ffc0abb3
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

2 files changed, 17 insertions, 6 deletions

diff --git a/README.md b/README.md
index a6a568b..ed5d427 100644
--- a/README.md
+++ b/README.md
@@ -63,9 +63,5 @@ Sensors example:
         return app.exec();
     }
 
-Raspbian's default calibration from /etc is picked up automatically, similarly to the
-Python lib. Note however that this is a text file and numbers may not be parsable with
-locale settings that use a decimal separator other than the dot. If the orientation data
-is invalid, check this first.
-
-Orientation is converted to degrees in range 0..360. Other values are reported as-is.
+Raspbian's default calibration from /etc is picked up automatically, similarly to the Python
+lib. Orientation is converted to degrees in range 0..360. Other values are reported as-is.
diff --git a/src/sensehat/qsensehatsensors.cpp b/src/sensehat/qsensehatsensors.cpp
index 0baafef..ff52efd 100644
--- a/src/sensehat/qsensehatsensors.cpp
+++ b/src/sensehat/qsensehatsensors.cpp
@@ -81,6 +81,20 @@ public:
     QVector3D orientation;
 };
 
+class CLocale
+{
+public:
+    CLocale() {
+        oldLoc = QByteArray(setlocale(LC_ALL, 0));
+        setlocale(LC_ALL, "C");
+    }
+    ~CLocale() {
+        setlocale(LC_ALL, oldLoc.constData());
+    }
+private:
+    QByteArray oldLoc;
+};
+
 QSenseHatSensorsPrivate::~QSenseHatSensorsPrivate()
 {
     delete rtpressure;
@@ -91,6 +105,7 @@ QSenseHatSensorsPrivate::~QSenseHatSensorsPrivate()
 
 void QSenseHatSensorsPrivate::open()
 {
+    CLocale c; // to avoid decimal separator trouble in the ini file
     const QString configFileName = QStringLiteral("RTIMULib.ini");
     const QString defaultConfig = QStringLiteral("/etc/") + configFileName;
     const QString writableConfigDir = QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation) + QStringLiteral("/sense_hat");