C/C++中ASCII與Unicode字串相互轉換
阿新 • • 發佈:2018-11-13
轉載地址:https://blog.csdn.net/wbq2018/article/details/8806431
1、ASCII to Unicode
函式: wcstombs(VC6)、wcstombs_s
例項:
//crt_wcstombs_s.c //This example converts a wide character //string to a multibyte character string. #include <stdio.h> #include <stdlib.h> #include <assert.h> #define BUFFER_SIZE 100 int main(void) { size_t i; char *pMBBuffer = (char *)malloc(BUFFER_SIZE); wchar_t *pWCBuffer = L"Hello, world."; printf("Convert wide-character string:\n"); //Conversion wcstombs_s(&i, pMBBuffer, (size_t)BUFFER_SIZE, pWCBuffer, (size_t)BUFFER_SIZE); //Output printf(" Characters converted: %u\n", i); printf(" Multibyte character: %s\n\n", pMBBuffer); //Free multibyte character buffer if (pMBBuffer) { free(pMBBuffer); } }
2、Unicode to ASCII
函式: mbstowcs
//crt_mbstowcs.c //compile with: /W3 //illustrates the behavior of the mbstowcs function #include <stdlib.h> #include <stdio.h> #include <locale.h> int main(void) { size_t size; int nChar = 2; //number of characters to convert int requiredSize; unsigned char *pmbnull = NULL; unsigned char *pmbhello = NULL; char *localeInfo; wchar_t *pwchello = L"\x3042\x3043"; //2 Hiragana characters wchar_t *pwc; /*Enable the Japanese locale and codepage */ localeInfo = setlocale(LC_ALL, "Japanese_Japan.932"); printf("Locale information set to %s\n", localeInfo); printf("Convert to multibyte string:\n"); requiredSize = wcstombs(NULL, pwchello, 0); //C4966 //Note: wcstombs is deprecated; consider using wcstombs_s printf("Required Size: %d\n", requiredSize); /*Add one to leave room for the null terminator.*/ pmbhello = (unsigned char *)malloc(requiredSize + 1); if (!pmbhello) { printf("Memory allocation failure.\n"); return 1; } size = wcstombs(pmbhello, pwchello, requiredSize + 1); //C4996 //Note: wcstombs is deprecated; consider using wcstombs_s if (size == (size_t)(-1)) { printf("Couldn't convert string. Code page 932 may" " not be available.\n"); return 1; } printf("Number of bytes written to multibyte string: %u\n", (unsigned int)size); printf("Hex values of the "); printf("multibyte characters: %#.2x %#.2x %#.2x %#.2x\n", pmbhello[0], pmbhello[1], pmbhello[2], pmbhello[3]); printf(" Codepage 932 uses 0x81 to 0x9f as lead bytes.\n\n"); printf("Convert back to wide-character string:\n"); /*Assume we don't know the length of the multibyte string. Get the required size in characters, and allocate enough space.*/ requiredSize = mbstowcs(NULL, pmbhello, 0); //C4996 /*Add one to leave room for the NULL terminator */ pwc = (wchar_t *)malloc((requiredSize + 1) * sizeof(wchar_t)); if (!pwc) { printf("Memory allocation failure.\n"); return 1; } size = mbstowcs(pwc, pmbhello, requiredSize+1); //C4996 if (size == (size_t)(-1)) { printf("Couldn't convert string--invalid multibyte character.\n"); } printf("Characters converted: %u\n", (unsigned int)size); printf("Hex value of first 2"); printf("wide characters: %#.4x %#.4x\n\n", pwc[0], pwc[1]); free(pwc); free(pmbhello); }