Using WideCharToMultiByte

Asked Jun 12 '23 at 17:36

Active Jun 12 '23 at 23:25

Viewed 69 times

I want to transfer and show an string from a control in VC++ to a file. in this way, I use the WideCharToMultiByte() function. But there is a problem!

This is my code:

CString m_sName=L"ABC";
int size_needed=WideCharToMultiByte(CP_UTF8, 0, m_sName, -1, NULL, 0, NULL, NULL);
std::string utf8_string(size_needed, 0);
WideCharToMultiByte(CP_UTF8, 0, m_sName, -1, &utf8_string[0], size_needed, NULL, NULL);

FILE *file;
fopen_s(&file, "bid.txt", "wb");
fprintf(file, "\nutf8_string[0]=%c", utf8_string[0]);
fprintf(file, "\nutf8_string[1]=%c", utf8_string[1]);
fprintf(file, "\nutf8_string[2]=%c", utf8_string[2]);
fprintf(file, "\nutf8_string=%s", utf8_string);
fclose(file);

When I open the bid.txt file, I can see:

utf8_string[0]=A
utf8_string[1]=B
utf8_string[2]=C

but:

utf8_string=NULL instead of utf8_string=ABC

this is my problem. WHY?!!

edited Jun 12 '23 at 23:25

Remy Lebeau

555,201
31
458
770

asked Jun 12 '23 at 17:36

Abbas

7

`fprintf` doesn't know how to print a `std::string`. You could use `utf8_string.c_str()`. – 001 Jun 12 '23 at 17:46
Generally, make sure you include a [mcve] in your question. – Ulrich Eckhardt Jun 12 '23 at 17:58
1

Didn't you get a compiler warning? I suggest setting `/W3` (IIRC, `/W4` generates a lot of noise from Microsoft's own header files, but it's worth trying). – Paul Sanders Jun 12 '23 at 18:05
1

you need `fprintf(file, "\nutf8_string=%s", utf8_string.c_str())` – Alan Birtles Jun 12 '23 at 19:55

Using WideCharToMultiByte

0 Answers0