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gphoto / libgphoto2

The libgphoto2 camera access and control library.
GNU Lesser General Public License v2.1
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seeking your kind assistance #983

Open letsfire opened 5 days ago

letsfire commented 5 days ago 
char* data;   
unsigned long int size = 1000;
CameraFile* file;
gp_file_new(&file);
CHECK_RESULT(gp_camera_file_get(camera, folder, name, GP_FILE_TYPE_NORMAL, file, context));
CHECK_RESULT(gp_file_get_data_and_size(file, &data, &size));

Why is the size correct, but the length of the data is only 10 bytes? I am use ptp2 (camlib) and libusb (port) in android with Canon EOS 60D

I/USB_CAMERA(11940): 5256827 - **the size of gp_file_get_data_and_size**
I/USB_CAMERA(11940): ����:\Exif  - **the data of gp_file_get_data_and_size**

Here is the log output of GP_LOG_DATA. Domain And Data Length.

I/USB_CAMERA(11940): Domain:gp_filesystem_get_file_impl, Data Len: 73
I/USB_CAMERA(11940): Domain:ptp, Data Len: 39
I/USB_CAMERA(11940): Domain:ptp, Data Len: 39
I/USB_CAMERA(11940): Domain:ptp, Data Len: 39
I/USB_CAMERA(11940): Domain:get_file_func, Data Len: 28
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 79
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 82
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34
I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199
I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 41
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 57665
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 37
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 707
I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39
I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141
msmeissn commented 3 days ago

On Sat, Jun 29, 2024 at 11:51:28AM -0700, letsfire wrote:

char* data;   
unsigned long int size = 1000;
CameraFile* file;
gp_file_new(&file);
CHECK_RESULT(gp_camera_file_get(camera, folder, name, GP_FILE_TYPE_NORMAL, file, context));
CHECK_RESULT(gp_file_get_data_and_size(file, &data, &size));

Why is the size correct, but the length of the data is only 10 bytes? I am use ptp2 (camlib) and libusb (port) in android with Canon EOS 60D

Where do you see the 10 bytes? The "����:\Exif" string?

The data returned here is in binary format, not a string, so do not use strlen or so for displaying.

Ciao, Marcus

I/USB_CAMERA(11940): 5256827 - the size of gp_file_get_data_and_size I/USB_CAMERA(11940): ����:\Exif - the data of gp_file_get_data_and_size

I/USB_CAMERA(11940): Domain:gp_filesystem_get_file_impl, Data Len: 73 I/USB_CAMERA(11940): Domain:ptp, Data Len: 39 I/USB_CAMERA(11940): Domain:ptp, Data Len: 39 I/USB_CAMERA(11940): Domain:ptp, Data Len: 39 I/USB_CAMERA(11940): Domain:get_file_func, Data Len: 28 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 79 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 84 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2359364 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 43 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 2354756 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 35 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 128 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141 I/USB_CAMERA(11940): Domain:ptp_usb_sendreq, Data Len: 82 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 34 I/USB_CAMERA(11940): Domain:gp_port_write, Data Len: 199 I/USB_CAMERA(11940): Domain:ptp_usb_getdata, Data Len: 50 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 4670 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 41 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 57665 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 37 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 707 I/USB_CAMERA(11940): Domain:ptp_usb_getresp, Data Len: 54 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 39 I/USB_CAMERA(11940): Domain:gp_port_read, Data Len: 141

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letsfire commented 3 days ago

Thank you. With your reminder, I have resolved my issue.