Conversion of char and wchar in Windows

I have just encapsulated a C method. The most common problem is the conversion of char and wchar. I found some information:

 

1. Define the macro in the header file;

# Define Unicode # DEFINE _ Unicode
2. Convert Char to wchar

Const char * pfilepathname = "C: \ AA. dll ";

Int nlen = strlen (pfilepathname) + 1;

Int nwlen = multibytetowidechar (cp_acp, 0, pfilepathname, nlen, null, 0 );
Tchar lpszfile [256];

Multibytetowidechar (cp_acp, 0, pfilepathname, nlen, lpszfile, nwlen );
3. Convert wchar to Char

Char * pfilepathname;

Tchar lpszfile [256];

_ Tcscpy (lpszfile, _ T ("C: \ AA. dll "));
Int nlen = wcslen (wstr) + 1;

Widechartomultibyte (cp_acp, 0, lpszfile, nlen, pfilepathname, 2 * nlen, null, null );

 

A complete example (ws2_32.lib)

1. # include <windows. h> 2. # include <stdio. h> 3. 4. // function: chartowchar 5. // purpose: Char to wchar, wchar_t, lpwstr etc 6. void chartowchar (const char * CHR, wchar_t * wchar, int size) 7. {8. multibytetowidechar (cp_acp, 0, CHR, 9. strlen (CHR) + 1, wchar, size/sizeof (wchar [0]); 10 .} 11. 12. // function: wchartochar 13. // purpose: wchar, wchar_t, lpwstr to Char 14. void wchartochar (const wchar_t * wchar, char * CHR, int length) 15. {16. widechartomultibyte (cp_acp, 0, wchar,-1, 17. CHR, length, null, null); 18 .} 19. optional int main (void) 21. {22. char CHR [128]; 23. wchar_t * wchar = l "Chen hongqin"; 24. 25. 26. // wchar_t to Char 27. wchartochar (wchar, CHR, sizeof (CHR); 28. printf ("char is % s \ n", CHR); 29. 30. // Char to wchar_t 31. wchar = (wchar_t *) malloc (sizeof (wchar_t) * 64); 32. chartowchar (CHR, wchar, sizeof (wchar_t) * 64); 33. 34. wprintf_s (L "% s \ n", wchar); // 35. getchar (); 36. 37. return 0; 38 .}

Another macro:

#include "atlconv.h" void func() {  USES_CONVERSION; char *test = "i am a sucker";  WCHAR *conv = A2W(strPic1) ; }