From: Alan C. <ala...@gm...> - 2018-03-04 03:29:51
|
Finally got back to this. I made a very stripped down preview capture program. It works, but the file I get each time is the picture took last time. It's getting stored somewhere, maybe the camera's memory. When I do gp_camera_capture_preview() and then gp_file_save() what gets saved is the previous picture. Then if I do it again I get the picture I took the first time. I want it for doing motion detection so it's not unusable, just 1 frame delayed. I haven't read a lot of documentation, I just finally got a chance to play with it again. Seems fast, my camera's giving me 320x240 images, just about what I want. The files get downloaded to my computer, looking at the camera with gtkam I don't see any stale images hanging around. I didn't realize gtkam could do captures (right click in the left window on the camera). This needs to be linked with context.c and config.c /* My Preview Trying to capture preview images with libgphoto2 */ // block of includes from preview.c #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <stdarg.h> #include <string.h> #include <gphoto2/gphoto2.h> #include "samples.h" #include <sys/time.h> // there's a gettimeofday somewhere Camera *canon; GPContext *canoncontext; void get_one(void) { // capture 1 preview image CameraFile *file; char jpgname[] = "test2.jpg"; int rslt; rslt = gp_file_new(&file); if (rslt) { printf("Error creating new CameraFile %i\n",rslt); exit(1); } // skipping focus for now but do it here // skipping zoom also rslt = gp_camera_capture_preview(canon, file, canoncontext); if (rslt) { printf("error capturing preview %i\n",rslt); exit(1); } rslt = gp_file_save(file, jpgname); if (rslt) { printf("Error saving file (in gp_file_save) %i\n",rslt); exit(1); } } int main(void) { int rslt; // skip this for now // gp_log_add_func(GP_LOG_ERROR, errordumper, NULL); gp_camera_new(&canon); canoncontext = sample_create_context(); printf("Camera init. Takes about 10 seconds.\n"); rslt = gp_camera_init(canon, canoncontext); if (rslt) { printf("Error initializing camera %i\n",rslt); exit(1); } canon_enable_capture(canon, TRUE, canoncontext); // in config.c get_one(); gp_camera_exit(canon, canoncontext); return 0; } -- ------------- No, I won't call it "climate change", do you have a "reality problem"? - AB1JX Impeach Impeach Impeach Impeach Impeach Impeach Impeach Impeach |