I get an image of a small line located at the end of the page. How to transfer settings to the scanner to get the whole page?

Here is my code:

#include <gtk/gtk.h> #include <sane/sane.h> #include <gdk-pixbuf/gdk-pixbuf.h> void button_cb(GtkButton *button,gpointer user_data) { SANE_Byte *buf = NULL; SANE_Status status; const SANE_Device **device_list = NULL; SANE_Handle h; SANE_Parameters p; const SANE_Option_Descriptor *d; buf = g_malloc(8000000); // 8 MB if(!buf) { g_print("Память не выделена\n"); } status = sane_init(NULL, NULL); // Инициализация g_print("sane_init: %d\n", (int)status); status = sane_get_devices (&device_list, FALSE); // Получение списка устройств for(int i = 0; device_list[i] != NULL; ++i) { g_print("Device: %s\n", device_list[i]->name); } status = sane_open(device_list[1]->name, &h); // Получение дескриптора устройства g_print("sane_open: %d\n", (int)status); // Установка параметров //SANE_Status sane_control_option(SANE_Handle h, SANE_Int n, SANE_Action a, void *v,SANE_Int * i); d = sane_get_option_descriptor(h, n); // Дескриптор опций g_print("Status,%d\n", (int)status); status = sane_start(h); g_print("sane_start:,%d\n", (int)status); status = sane_get_parameters(h, &p); // Получение параметров со сканера g_print("sane_get_parameters: %d\n", (int)status); // Чтение со сканера SANE_Int len = 0; int n = 0; while(status != SANE_STATUS_EOF) { status = sane_read(h, buf + n, 4000000, &len); if(len != 0) { n = n + len; } } // Сохранение в файл GBytes *data; data = g_bytes_new(buf, (gsize)n); GdkPixbuf *pixbuf; pixbuf = gdk_pixbuf_new_from_bytes(data, GDK_COLORSPACE_RGB, FALSE, p.depth, p.pixels_per_line, p.lines, p.bytes_per_line); gdk_pixbuf_save(pixbuf, "image.jpeg", "jpeg", NULL, "quality", "100", NULL); // Освобождение ресурсов g_object_unref(pixbuf); g_free(buf); sane_cancel(h); sane_close(h); sane_exit(); } int main(int argc, char **argv) { GtkWidget *window; GtkWidget *box; GtkWidget *button; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW(window), "Библиотека Sane"); gtk_window_set_default_size(GTK_WINDOW(window), 320, 240); box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 10); gtk_container_add(GTK_CONTAINER(window), box); gtk_widget_set_halign(box,GTK_ALIGN_CENTER); gtk_widget_set_valign(box,GTK_ALIGN_CENTER); button = gtk_button_new_with_label("Сканирование"); gtk_box_pack_start(GTK_BOX(box), button, FALSE, FALSE, 10); g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(button_cb), NULL); gtk_widget_show_all(window); gtk_main(); return 0; }

Fixed - get the full image. I change the scanner settings from c RGB to GRAY - gdk_pixbuf_new_from_bytes swears.

Exhaust in the console:

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_new_from_bytes: assertion 'bits_per_sample == 8' failed

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion 'GDK_IS_PIXBUF (src)' failed

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_rowstride: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_n_channels: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(main: 8397): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

    1 answer 1

    so you are rubbing the buffer .. you need to shift the pointer on each iteration.

    GDK_COLORSPACE_RGB should match the space of the captured image. there should still be the same number of bits per pixel.