xlsxio/examples/example_xlsxio_read.c

//#define PROCESS_FROM_MEMORY
#define PROCESS_FROM_FILEHANDLE
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Copyright (C)  2016  Brecht Sanders  All Rights Reserved

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/**
 * @file example_xlsxio_read.c
 * @brief XLSX I/O example illustrating how to read from an .xlsx file.
 * @author Brecht Sanders
 *
 * This example reads data from an .xslx file using the simple method.
 */

//#define PROCESS_FROM_MEMORY

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if _WIN32
#include <windows.h>
#else
#define O_BINARY 0
#endif
#ifdef PROCESS_FROM_MEMORY
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
#ifdef PROCESS_FROM_FILEHANDLE
//#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
#include "xlsxio_read.h"

#if !defined(XML_UNICODE_WCHAR_T) && !defined(XML_UNICODE)
//UTF-8 version
#define X(s) s
#define XML_Char_printf printf
#else
//UTF-16 version
#define X(s) L##s
#define XML_Char_printf wprintf
#endif

const char* filename = "example.xlsx";

int main (int argc, char* argv[])
{
#ifdef _WIN32
  //switch Windows console to UTF-8
  SetConsoleOutputCP(CP_UTF8);
#endif

  if (argc > 1)
    filename = argv[1];

  xlsxioreader xlsxioread;

  XML_Char_printf(X("XLSX I/O library version %s\n"), xlsxioread_get_version_string());

#if defined(PROCESS_FROM_MEMORY)
  {
    //load file in memory
    int filehandle;
    char* buf = NULL;
    size_t buflen = 0;
    if ((filehandle = open(filename, O_RDONLY | O_BINARY)) != -1) {
      struct stat fileinfo;
      if (fstat(filehandle, &fileinfo) == 0) {
        if ((buf = malloc(fileinfo.st_size)) != NULL) {
          if (fileinfo.st_size > 0 && read(filehandle, buf, fileinfo.st_size) == fileinfo.st_size) {
            buflen = fileinfo.st_size;
          }
        }
      }
      close(filehandle);
    }
    if (!buf || buflen == 0) {
      fprintf(stderr, "Error loading .xlsx file\n");
      return 1;
    }
    if ((xlsxioread = xlsxioread_open_memory(buf, buflen, 1)) == NULL) {
      fprintf(stderr, "Error processing .xlsx data\n");
      return 1;
    }
  }
#elif defined(PROCESS_FROM_FILEHANDLE)
  //open .xlsx file for reading
  int filehandle;
  if ((filehandle = open(filename, O_RDONLY | O_BINARY, 0)) == -1) {
    fprintf(stderr, "Error opening .xlsx file\n");
    return 1;
  }
  if ((xlsxioread = xlsxioread_open_filehandle(filehandle)) == NULL) {
    fprintf(stderr, "Error reading .xlsx file\n");
    return 1;
  }
#else
  //open .xlsx file for reading
  if ((xlsxioread = xlsxioread_open(filename)) == NULL) {
    fprintf(stderr, "Error opening .xlsx file\n");
    return 1;
  }
#endif

  //list available sheets
  xlsxioreadersheetlist sheetlist;
  const XLSXIOCHAR* sheetname;
  printf("Available sheets:\n");
  if ((sheetlist = xlsxioread_sheetlist_open(xlsxioread)) != NULL) {
    while ((sheetname = xlsxioread_sheetlist_next(sheetlist)) != NULL) {
      XML_Char_printf(X(" - %s\n"), sheetname);
    }
    xlsxioread_sheetlist_close(sheetlist);
  }

  //read values from first sheet
  XLSXIOCHAR* value;
  printf("Contents of first sheet:\n");
  xlsxioreadersheet sheet = xlsxioread_sheet_open(xlsxioread, NULL, XLSXIOREAD_SKIP_EMPTY_ROWS);
  while (xlsxioread_sheet_next_row(sheet)) {
    while ((value = xlsxioread_sheet_next_cell(sheet)) != NULL) {
      XML_Char_printf(X("%s\t"), value);
      xlsxioread_free(value);
    }
    printf("\n");
  }
  xlsxioread_sheet_close(sheet);

  //clean up
  xlsxioread_close(xlsxioread);
  return 0;
}