1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
#include "samples.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
/*
* This function looks up a label or key entry of
* a configuration widget.
* The functions descend recursively, so you can just
* specify the last component.
*/
static int
_lookup_widget(CameraWidget*widget, const char *key, CameraWidget **child) {
int ret;
ret = gp_widget_get_child_by_name (widget, key, child);
if (ret < GP_OK)
ret = gp_widget_get_child_by_label (widget, key, child);
return ret;
}
/* Gets a string configuration value.
* This can be:
* - A Text widget
* - The current selection of a Radio Button choice
* - The current selection of a Menu choice
*
* Sample (for Canons eg):
* get_config_value_string (camera, "owner", &ownerstr, context);
*/
int
get_config_value_string (Camera *camera, const char *key, char **str, GPContext *context) {
CameraWidget *widget = NULL, *child = NULL;
CameraWidgetType type;
int ret;
char *val;
ret = gp_camera_get_config (camera, &widget, context);
if (ret < GP_OK) {
fprintf (stderr, "camera_get_config failed: %d\n", ret);
return ret;
}
ret = _lookup_widget (widget, key, &child);
if (ret < GP_OK) {
fprintf (stderr, "lookup widget failed: %d\n", ret);
goto out;
}
/* This type check is optional, if you know what type the label
* has already. If you are not sure, better check. */
ret = gp_widget_get_type (child, &type);
if (ret < GP_OK) {
fprintf (stderr, "widget get type failed: %d\n", ret);
goto out;
}
switch (type) {
case GP_WIDGET_MENU:
case GP_WIDGET_RADIO:
case GP_WIDGET_TEXT:
break;
default:
fprintf (stderr, "widget has bad type %d\n", type);
ret = GP_ERROR_BAD_PARAMETERS;
goto out;
}
/* This is the actual query call. Note that we just
* a pointer reference to the string, not a copy... */
ret = gp_widget_get_value (child, &val);
if (ret < GP_OK) {
fprintf (stderr, "could not query widget value: %d\n", ret);
goto out;
}
/* Create a new copy for our caller. */
*str = strdup (val);
out:
gp_widget_free (widget);
return ret;
}
/* Sets a string configuration value.
* This can set for:
* - A Text widget
* - The current selection of a Radio Button choice
* - The current selection of a Menu choice
*
* Sample (for Canons eg):
* get_config_value_string (camera, "owner", &ownerstr, context);
*/
int
set_config_value_string (Camera *camera, const char *key, const char *val, GPContext *context) {
CameraWidget *widget = NULL, *child = NULL;
CameraWidgetType type;
int ret;
ret = gp_camera_get_config (camera, &widget, context);
if (ret < GP_OK) {
fprintf (stderr, "camera_get_config failed: %d\n", ret);
return ret;
}
ret = _lookup_widget (widget, key, &child);
if (ret < GP_OK) {
fprintf (stderr, "lookup widget failed: %d\n", ret);
goto out;
}
/* This type check is optional, if you know what type the label
* has already. If you are not sure, better check. */
ret = gp_widget_get_type (child, &type);
if (ret < GP_OK) {
fprintf (stderr, "widget get type failed: %d\n", ret);
goto out;
}
switch (type) {
case GP_WIDGET_MENU:
case GP_WIDGET_RADIO:
case GP_WIDGET_TEXT:
case GP_WIDGET_TOGGLE:
break;
default:
fprintf (stderr, "widget has bad type %d\n", type);
ret = GP_ERROR_BAD_PARAMETERS;
goto out;
}
/* This is the actual set call. Note that we keep
* ownership of the string and have to free it if necessary.
*/
ret = gp_widget_set_value (child, val);
if (ret < GP_OK) {
fprintf (stderr, "could not set widget value: %d\n", ret);
goto out;
}
/* This stores it on the camera again */
ret = gp_camera_set_config (camera, widget, context);
if (ret < GP_OK) {
fprintf (stderr, "camera_set_config failed: %d\n", ret);
return ret;
}
out:
gp_widget_free (widget);
return ret;
}
/*
* This enables/disables the specific canon capture mode.
*
* For non canons this is not required, and will just return
* with an error (but without negative effects).
*/
int
canon_enable_capture (Camera *camera, int onoff, GPContext *context) {
CameraWidget *widget = NULL, *child = NULL;
CameraWidgetType type;
int ret;
ret = gp_camera_get_config (camera, &widget, context);
if (ret < GP_OK) {
fprintf (stderr, "camera_get_config failed: %d\n", ret);
return ret;
}
ret = _lookup_widget (widget, "capture", &child);
if (ret < GP_OK) {
/*fprintf (stderr, "lookup widget failed: %d\n", ret);*/
goto out;
}
ret = gp_widget_get_type (child, &type);
if (ret < GP_OK) {
fprintf (stderr, "widget get type failed: %d\n", ret);
goto out;
}
switch (type) {
case GP_WIDGET_TOGGLE:
break;
default:
fprintf (stderr, "widget has bad type %d\n", type);
ret = GP_ERROR_BAD_PARAMETERS;
goto out;
}
/* Now set the toggle to the wanted value */
ret = gp_widget_set_value (child, &onoff);
if (ret < GP_OK) {
fprintf (stderr, "toggling Canon capture to %d failed with %d\n", onoff, ret);
goto out;
}
/* OK */
ret = gp_camera_set_config (camera, widget, context);
if (ret < GP_OK) {
fprintf (stderr, "camera_set_config failed: %d\n", ret);
return ret;
}
out:
gp_widget_free (widget);
return ret;
}
|
