adding error message diablog

Makefile

@@ -4,7 +4,7 @@ APP = simpleskycam
 
 -include Makefile.rules
 
-OBJECTS := $(OBJECTS) gui.oo main.oo \
+OBJECTS := $(OBJECTS) gui.oo main.oo error.oo \
 		   video.oo videoframe.oo \
 		   videodev.oo videodev-v4l2.oo videodev-dumpfile.oo \
 		   convert.oo filter.oo detect.oo histogram.oo pid.oo \

error.cc

@@ -0,0 +1,59 @@
+/***************************************************************************************
+ *
+ * error.h is part of SimpleSkyCam.
+ *
+ *****************************************************************************************/
+
+#include <string>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <math.h>
+#include "gui.h"
+#include "error.h"
+#include "configuration.h"
+
+extern GtkBuilder *_builder_;						// work around for threads
+
+gboolean errormessage_thread (gpointer data) {
+	struct ErrorMessage *em = (struct ErrorMessage*) data;
+	GtkWidget *window = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_),
+								   em->window));
+
+	if (window == NULL) window = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_),
+																	"window-main"));
+
+	GtkWidget *dialog;
+	dialog = gtk_message_dialog_new(GTK_WINDOW(window),
+			 GTK_DIALOG_DESTROY_WITH_PARENT,
+			 GTK_MESSAGE_ERROR,
+			 GTK_BUTTONS_OK,
+			 "%s", em->message);
+	gtk_window_set_title(GTK_WINDOW(dialog), em->title);
+	gtk_dialog_run(GTK_DIALOG(dialog));
+	gtk_widget_destroy(dialog);
+
+	free (em);
+
+	return false;
+};
+
+
+void errormessage_display (char *window, char *title, char *fmt,...) {
+	struct ErrorMessage *em = (struct ErrorMessage *) malloc (sizeof (struct ErrorMessage));
+
+	va_list args;
+	char buffer[ERRORMSG_LEN];
+
+	va_start (args, fmt);
+	vsnprintf (buffer, (ERRORMSG_LEN-1), fmt, args);
+	va_end (args);
+	buffer[ERRORMSG_LEN-1] = 0;
+	strncpy(em->title, title, ERRORMSG_LEN); 	em->title[ERRORMSG_LEN-1] = 0;
+	strncpy(em->message, buffer, ERRORMSG_LEN);	em->message[ERRORMSG_LEN-1] = 0;
+	strncpy(em->window, window, ERRORMSG_LEN);	em->window[ERRORMSG_LEN-1] = 0;
+
+	gdk_threads_add_idle(errormessage_thread, em);
+};
+
+

error.h

@@ -0,0 +1,20 @@
+/***************************************************************************************
+ *
+ * error.h is part of SimpleSkyCam.
+ *
+ *****************************************************************************************/
+
+
+#ifndef _ERROR_H_
+#define _ERROR_H_
+
+#define ERRORMSG_LEN 2048
+struct ErrorMessage {
+	char window[ERRORMSG_LEN];
+	char title[ERRORMSG_LEN];
+	char message[ERRORMSG_LEN];
+};
+
+void errormessage_display (char *windowname, char *title, char *fmt,...);
+
+#endif    // _ERROR_H_

gui.cc

@@ -91,20 +91,6 @@ void cb_menu_set_rgbenc (GtkCheckMenuItem *checkmenuitem,  gpointer user_data) {
 }
 
 
-void displayerror (std::string error) {
-	GtkWidget *dialog;
-	GtkWidget *window = GTK_WIDGET (gtk_builder_get_object (_builder_, "main-window"));
-	dialog = gtk_message_dialog_new(GTK_WINDOW(window),
-			 GTK_DIALOG_DESTROY_WITH_PARENT,
-			 GTK_MESSAGE_ERROR,
-			 GTK_BUTTONS_OK,
-			 "%s", error.c_str());
-	gtk_window_set_title(GTK_WINDOW(dialog), "Error");
-	gtk_dialog_run(GTK_DIALOG(dialog));
-	gtk_widget_destroy(dialog);
-};
-
-
 //data
 // callback from filter thread. Data will point to the output VideoFrame.
 // Access to this data must be Locked before use.

gui.h

@@ -45,8 +45,6 @@ struct {
 	float dy;
 } typedef detect_movement;
 
-void displayerror (std::string error);
-
 void draw_text (cairo_t *cr, int x, int y, float border, std::string text);
 
 #ifdef __cplusplus
@@ -134,13 +132,18 @@ G_MODULE_EXPORT void cb_posctl_axis_draw(GtkWidget *area, cairo_t *cr, int w, in
 G_MODULE_EXPORT void cb_posctl_change_entry (GtkWidget *widget, gpointer data);
 G_MODULE_EXPORT void cb_posctl_btn_axismove (GtkWidget *widget, gpointer data);
 
-
-
 //
 // menu elements
 G_MODULE_EXPORT void cb_menu_set_rgbenc (GtkCheckMenuItem *checkmenuitem,  gpointer user_data);
 G_MODULE_EXPORT void cb_menu_set_histlog (GtkCheckMenuItem *checkmenuitem,  gpointer user_data);
 
+//
+// error handling
+G_MODULE_EXPORT gboolean errormessage_thread (gpointer data);
+G_MODULE_EXPORT void errormessage_cb_btnok (GtkWidget *widget, gpointer data);
+
+
+
 #ifdef __cplusplus
 }
 #endif

posctl.cc

@@ -18,6 +18,7 @@
 #include "video.h"
 #include "videodev.h"
 #include "histogram.h"
+#include "error.h"
 
 extern PosCtl posctl;
 
@@ -620,6 +621,8 @@ void PosCtl::OutputOpen() {
 	if (device_fd < 0) {
 		printf ("%s:%d could not open device:%s Error:%s\n", __FILE__, __LINE__,
 				device.c_str(), strerror(errno));
+		errormessage_display ((char *)"window-posctl", (char *)"OutputOpen",
+				(char*)"%s:%d could not open device:%s Error:%s\n", __FILE__, __LINE__, device.c_str(), strerror(errno));
 	}
 };
 
@@ -636,8 +639,9 @@ void PosCtl::OutputWriteValue (int axis, double value) {
 	std::string s = setlocale(LC_ALL, NULL);
 	setlocale (LC_ALL, "C");
 
-	if (axis == 0) 	snprintf(outbuf, 254, "RA:%08.4f#\n", value);
-	else 			snprintf(outbuf, 254, "RR:%08.4f#\n", value);
+	snprintf(outbuf, 254, "R%c%c%08.4f#\n", (axis == 0 ? 'A' : 'R'),
+											(value < 0 ? '-' : '+'),
+											value);
 	outbuf[254] = 0;
 
 	// reset language setting to default