Concat wchar_t Unicode strings in C?
- by Doori Bar
I'm a beginner, I play with FindFirstFileW() of the winapi - C. The unicoded path is: "
\\?\c:\Français\", and I would like to concat "*" to this path of type wchar_t (then I will use it as an arg for FindFirstFileW()).
I made two test cases of mine, the first is ansi_string() which seem to work fine, the second is unicode_string() - which I don't quite understand how should I concat the additional "*" char to the unicoded path. I write the strings to a file, because I'm not able to print Unicoded characters to stdout.
Note: my goal is to learn, which means I'll appreciate guidance and references to the appropriate resources regards my scenario, I'm very much a beginner and this is my first attempt with Unicode.
Thanks, Doori Bar
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <string.h>
#include <errno.h>
void *error_malloc(int size);
void ansi_string(char **str1, char **str2);
void unicode_string(wchar_t **wstr1, wchar_t **wstr2);
void unicode_string(wchar_t **wstr1, wchar_t **wstr2)
{
/* assign wstr1 with the path: \\?\c:\Français\ */
*wstr1 = error_malloc((wcslen(L"\\\\?\\c:\\Français\\")+1) *sizeof(**wstr1));
wcscpy(*wstr1,L"\\\\?\\c:\\Français\\");
/* concat wstr1+"*" , assign wstr2 with: \\?\c:\Français\* */
*wstr2 = error_malloc((wcslen(*wstr1) + 1 + 1) * sizeof(**wstr1));
/* swprintf(*wstr2,"%ls*",*wstr1); */
/* how should I concat wstr1+"*"? */
wcscpy(*wstr2,L"\\\\?\\c:\\Français\\");
}
void ansi_string(char **str1, char **str2)
{
/* assign str1 with the path: c:\English\ */
*str1 = error_malloc(strlen("c:\\English\\") + 1);
strcpy(*str1,"c:\\English\\");
/* concat str1+"*" , assign str2 with: c:\English\* */
*str2 = error_malloc(strlen(*str1) + 1 + 1);
sprintf(*str2,"%s*",*str1);
}
void *error_malloc(int size)
{
void *ptr;
int errornumber;
if ((ptr = malloc(size)) == NULL) {
errornumber = errno;
fprintf(stderr,"Error: malloc(): %d; Error Message: %s;\n",
errornumber,strerror(errornumber));
exit(1);
}
return ptr;
}
int main(void)
{
FILE *outfile;
char *str1;
char *str2;
wchar_t *wstr1;
wchar_t *wstr2;
if ((outfile = fopen("out.bin","w")) == NULL) {
printf("Error: fopen failed.");
return 1;
}
ansi_string(&str1,&str2);
fwrite(str2, sizeof(*str2), strlen(str2), outfile);
printf("strlen: %d\n",strlen(str2));
printf("sizeof: %d\n",sizeof(*str2));
free(str1);
free(str2);
unicode_string(&wstr1,&wstr2);
fwrite(wstr2, sizeof(*wstr2), wcslen(wstr2), outfile);
printf("wcslen: %d\n",wcslen(wstr2));
printf("sizeof: %d\n",sizeof(*wstr2));
free(wstr1);
free(wstr2);
fclose(outfile);
return 0;
}
