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/*
* Example of using libxlsxwriter for writing large files in constant memory
* mode.
*
* Copyright 2014-2026, John McNamara, jmcnamara@cpan.org
*
*/
#include "xlsxwriter.h"
int main() {
lxw_row_t row;
lxw_col_t col;
lxw_row_t max_row = 1000;
lxw_col_t max_col = 50;
/* Set the worksheet options. */
lxw_workbook_options options = {.constant_memory = LXW_TRUE,
.tmpdir = NULL,
.use_zip64 = LXW_FALSE,
.output_buffer = NULL,
.output_buffer_size = NULL};
/* Create a new workbook with options. */
lxw_workbook *workbook = workbook_new_opt("constant_memory.xlsx", &options);
lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
for (row = 0; row < max_row; row++) {
for (col = 0; col < max_col; col++) {
worksheet_write_number(worksheet, row, col, 123.45, NULL);
}
}
return workbook_close(workbook);
}
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