new file: maintain_focus.c

new file:   makefile

maintain_focus.c

@@ -0,0 +1,78 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <gphoto2/gphoto2.h>
+#include <time.h>
+
+#define FOCUS_WIDGET_NAME         "manualfocusdrive"
+#define VIEWFINDER_WIDGET_NAME    "viewfinder"
+
+/**
+ gp_widget_set_value(CameraWidget*, const void) <-sets value
+ gp_widget_get_child_by_label(CameraWidget* widget, const char* label, CameraWidget ** child) <- child is widget
+ gp_camera_get_config(Camera* camera, CameraWidget **window, GpContext* context) <- window is parent
+
+ camera_init(Camera* camera, GPContext *context)
+
+
+ Create context: 
+ 	context = gp_context_new();
+      gp_context_set_error_func (context, ctx_error_func, NULL);
+      gp_context_set_status_func (context, ctx_status_func, NULL);
+ Create camera:
+  gp_camera_new(&camera); <- point to return value
+
+**/
+
+
+int set_widget_value(CameraWidget *widget, void *widget_value, const char *widget_name, Camera *camera, GPContext *context) {
+  int err;
+  if ((err = gp_widget_set_value(widget, widget_value)) != 0) {
+    printf("Error setting local widget value: %s\nThis is not the hardware\'s fault. Fix your code!\n", gp_result_as_string(err));
+    return(1);
+  }
+  if((err = gp_camera_set_single_config(camera, widget_name, widget, context)) != 0) {
+    printf("Error modifying camera widget: %s\n", gp_result_as_string(err));
+    return(2);
+  }
+  
+}
+
+int main() {
+  char *focus_large_temp = "Near 3";
+  int viewfinder_state = 1; //wish there was a better way to do this...
+  int err;
+  Camera *cam;
+  CameraWidget *widget_root;
+  CameraWidget *focus_widget;
+  CameraWidget *liveview_widget;
+  
+  GPContext *context = gp_context_new(); 
+  gp_camera_new(&cam);
+
+  //start up and connect to camera  
+  printf("Initilizing camera...\n");
+  if ((err = gp_camera_init(cam, context)) != 0) {
+    printf("Couldn't connect to camera: %s\n", gp_result_as_string(err));
+    return(1);
+  }
+
+  //get configuration tree
+  gp_camera_get_config(cam, &widget_root, context); 
+  //get child widgets
+  gp_widget_get_child_by_name(widget_root, FOCUS_WIDGET_NAME, &focus_widget);
+  gp_widget_get_child_by_name(widget_root, VIEWFINDER_WIDGET_NAME, &liveview_widget);
+
+  //set to liveview so we can ajust focus
+  set_widget_value(liveview_widget, &viewfinder_state, VIEWFINDER_WIDGET_NAME, cam, context); 
+
+  
+
+  
+  gp_camera_exit(cam, context); 
+  
+  
+  return(1);
+
+}

makefile

@@ -0,0 +1,8 @@
+CC=gcc
+OUT=capture_focus
+
+make: maintain_focus.c
+	$(CC) maintain_focus.c -lgphoto2 -o $(OUT)
+debug: maintain_focus.c
+	$(CC) maintain_focus.c -lgphoto2 -ggdb -o $(OUT)
+