c - 如何在C中生成1GB的xml文件

Question

我不知道谁在 XML 标签内生成 1GB 的数据。我想在1GB大小的数据文本内生成一行数据我怎样才能以最有效(速度方面)的方式实现这一点。数据应该是可读的(当然可以是废话)

#include <stdio.h>

int main() {

    printf(" --- Creating XML");

    FILE *fptr;

    /*  open for writing */
    fptr = fopen("/tmp/emp.xml", "w");

    if (fptr == NULL)
    {
            printf("File does not exists \n");
            return 1;
    }


    fprintf(fptr, "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n");
    fprintf(fptr, "<customer id=\"100\">\n");
    fprintf(fptr, "    <age>25</age>\n");
    fprintf(fptr, "    <name>New Customer</name>\n");
    fprintf(fptr, "    <data>dhgdhgdkrjgndliutghdnkljtghdliuthgdithugdnk...1GB_LONG<data>\n");
    fprintf(fptr, "</customer>");

    fclose(fptr);
}

Answer 1

我通过创建三个文件解决了这个问题。

与 xml 一起，直到打开数据应驻留的标记。第二个是生成的垃圾数据。第三个是 xml 其余部分的批量数据的结束标记。

像这样:

   // Open two files to be merged
   FILE *fp1 = fopen("person1.xml", "r");
   FILE *fp2 = fopen("randomdata.txt", "r");
   FILE *fp3 = fopen("person3.xml", "r");


   // Open file to store the result
   FILE *fp4 = fopen("personf.xml", "w");
   char c;

   if (fp1 == NULL || fp2 == NULL || fp3 == NULL || fp4 == NULL)
   {
         puts(" --- Could not open files");
         exit(0);
   }

   // Copy contents of first file1
   while ((c = fgetc(fp1)) != EOF)
      fputc(c, fp4);

   printf(" --- Done copying file 1\n");
   // Copy contents of first file2
   while ((c = fgetc(fp2)) != EOF)
      fputc(c, fp4);

   printf(" --- Done copying file 2\n");

   // Copy contents of first file3
   while ((c = fgetc(fp3)) != EOF)
      fputc(c, fp4);

   printf(" --- Done copying file 3\n");

   printf("Merged files\n");

   fclose(fp1);
   fclose(fp2);
   fclose(fp3);
   fclose(fp4);
   return 0;