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/* minimal.c: a minmal example for using the QL-570 utility functions
*
* Copyright (C) 2015 Clemens Fries <github-raster@xenoworld.de>
*
* This file is part of rastertoql570.
*
* rastertoql570 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* rastertoql570 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rastertoql570. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../ql570.h"
#include <stdlib.h>
#include <errno.h>
/**
* Raster line length for the QL-570 is 90 bytes. There are some other QL
* series printers that need a larger buffer.
*/
#define BUFFER_SIZE 90
/**
* Minimal example program for direct printer access.
*
* For a better understanding of what goes on here, please refer
* to the documentation of each function. At times there are
* interesting bits of information over there.
*
*/
int main()
{
char *devname = "/dev/usb/lp0";
FILE *device = fopen(devname, "wb");
if (device == NULL) {
fprintf(stderr, "Error while opening %s: %s\n", devname, strerror(errno));
return EXIT_FAILURE;
}
ql_status status = {0};
uint8_t buffer[BUFFER_SIZE];
/*
* Request a print job with 150 lines (the minimal amount of lines for
* the QL-570). Note that this number is mandatory. If you print less
* than 150 lines, or indicate some wrong amount of lines here, the
* printer will just resort to blinking its red LED while observing you
* with displeasure.
*/
ql_print_info print_info = { .raster_number[0] = 150 };
/*
* Initialise printer. The first flag indicates that we won't be
* flushing the printer with 200 bytes of zeroes.
*/
ql_init(false, device);
/*
* Ask the printer to give us a status report.
*/
ql_status_request(device);
/*
* Retrieve the status report.
*/
ql_status_read(&status, device);
/*
* Send the contents of `print_info` to the printer.
*/
ql_page_start(&print_info, device);
/*
* Set some extended options: cut-at-end plus 300dpi printing.
*/
ql_set_extended_options(true, false, device);
/*
* Print some black lines.
*/
for (int i = 0; i < 150; i++) {
/*
* Every now and then: Many, many 1s.
*/
memset(buffer, i % 5 == 0 ? 0xFF : 0x00, BUFFER_SIZE);
/*
* We empty the first two bytes in order to force a small
* margin. Note that for 62mm the right and left margin is
* about 12 dots. I observed that I have a margin any way on
* one side, but it looks like it is printing outside the label
* area on the other side. It's not that important, but I do
* it anyway because I'm not sure about the mechanics and how
* well the print heads cope with doing their thing outside
* the printable area.
*
*/
buffer[0] = 0x00;
buffer[1] = 0x00;
/*
* Send this raster line to the printer.
*/
ql_raster(BUFFER_SIZE, buffer, device);
}
/*
* Indicate the end of raster data to the printer.
*/
ql_raster_end(BUFFER_SIZE, device);
/*
* Tell it that this was the last page.
*/
ql_page_end(true, device);
fclose(device);
}
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