文件需保存为UTF-8格式

int main()
{
    char str[256] = "汉字\n枯藤昏鸦\n罪恶之都\n资源不够不可以建造";
    char ustr[256] = 
        "\\u6c49\\u5b57"
        "\\u000a"
        "\\u67af\\u85e4\\u660f\\u9e26"
        "\\u000a"
        "\\u7f6a\\u6076\\u4e4b\\u90fd"
        "\\u000a"
        "\\u8d44\\u6e90\\u4e0d\\u591f\\u4e0d\\u53ef\\u4ee5\\u5efa\\u9020";
    wchar_t wstr[64];
    
    size_t len;
    size_t i;
    
    printf("Start UTF convert test...\n");
    printf("Before conversion...\n");
    printf("UTF-8 HEX: \n");
    for(i = 0; str[i]; i++)
    {
        printf("0x%02X ", str[i] & 0xFF);
    }
    printf("0x%02X \n", str[i + 1] & 0xFF);
    printf("UTF-8 string: \n%s\n\n", str);
    
    printf("Convert from UTF-8 to UTF-16...\n");
    len = convert_UTF8_to_UTF16(str, wstr);    
    printf("len = %d\n", len);
    printf("UTF-16 HEX: \n");
    for(i = 0; i <= len; i++)
    {
        printf("0x%04X  ", wstr[i] & 0xFFFF);
    }
    printf("\n\n");
    
    printf("Convert from UTF-16 to UTF-8...\n");
    len = convert_UTF16_to_UTF8(wstr, str);    
    printf("len = %d\n", len);
    printf("UTF-8 HEX: \n");
    for(i = 0; i <= len; i++)
    {
        printf("0x%02X ", str[i] & 0xFF);
    }
    printf("\n");
    printf("UTF-8 string: \n%s\n\n", str);
            
    printf("Start \\uhhhh sequence convert test...\n");
    printf("Before conversion...\n");
    printf("u sequence: \n%s\n\n", ustr);

    printf("Convert from \\uhhhh sequence to UTF-16...\n");
    len = convert_useq_to_UTF16(ustr, wstr);
    printf("lenth = %d\n", len);
    printf("UTF-16 HEX: \n");
    for(i = 0; i < len; i++)
    {
        printf("0x%04X  ", wstr[i] & 0xFFFF);
    }
    printf("\n\n");
    
    printf("Convert from UTF-16 to UTF-8...\n");
    len = convert_UTF16_to_UTF8(wstr, ustr);
    printf("lenth = %d\n", len);
    printf("UTF-8 string: \n%s\n", ustr);

    return 0;
}


测试结果如下:
Start UTF convert test...
Before conversion...
UTF-8 HEX: 
0xE6 0xB1 0x89 0xE5 0xAD 0x97 0x0A 0xE6 0x9E 0xAF 0xE8 0x97 0xA4 0xE6 0x98 0x8F 
0xE9 0xB8 0xA6 0x0A 0xE7 0xBD 0xAA 0xE6 0x81 0xB6 0xE4 0xB9 0x8B 0xE9 0x83 0xBD 
0x0A 0xE8 0xB5 0x84 0xE6 0xBA 0x90 0xE4 0xB8 0x8D 0xE5 0xA4 0x9F 0xE4 0xB8 0x8D 
0xE5 0x8F 0xAF 0xE4 0xBB 0xA5 0xE5 0xBB 0xBA 0xE9 0x80 0xA0 0x00 
UTF-8 string: 
汉字
枯藤昏鸦
罪恶之都
资源不够不可以建造

Convert from UTF-8 to UTF-16...
len = 22
UTF-16 HEX: 
0x6C49  0x5B57  0x000A  0x67AF  0x85E4  0x660F  0x9E26  0x000A  0x7F6A  0x6076  
0x4E4B  0x90FD  0x000A  0x8D44  0x6E90  0x4E0D  0x591F  0x4E0D  0x53EF  0x4EE5  
0x5EFA  0x9020  0x0000  

Convert from UTF-16 to UTF-8...
len = 60
UTF-8 HEX: 
0xE6 0xB1 0x89 0xE5 0xAD 0x97 0x0A 0xE6 0x9E 0xAF 0xE8 0x97 0xA4 0xE6 0x98 0x8F 
0xE9 0xB8 0xA6 0x0A 0xE7 0xBD 0xAA 0xE6 0x81 0xB6 0xE4 0xB9 0x8B 0xE9 0x83 0xBD 
0x0A 0xE8 0xB5 0x84 0xE6 0xBA 0x90 0xE4 0xB8 0x8D 0xE5 0xA4 0x9F 0xE4 0xB8 0x8D 
0xE5 0x8F 0xAF 0xE4 0xBB 0xA5 0xE5 0xBB 0xBA 0xE9 0x80 0xA0 0x00 
UTF-8 string: 
汉字
枯藤昏鸦
罪恶之都
资源不够不可以建造

Start \uhhhh sequence convert test...
Before conversion...
u sequence: 
\u6c49\u5b57\u000a\u67af\u85e4\u660f\u9e26\u000a\u7f6a\u6076\u4e4b\u90fd\u000a
\u8d44\u6e90\u4e0d\u591f\u4e0d\u53ef\u4ee5\u5efa\u9020

Convert from \uhhhh sequence to UTF-16...
lenth = 22
UTF-16 HEX: 
0x6C49  0x5B57  0x000A  0x67AF  0x85E4  0x660F  0x9E26  0x000A  0x7F6A  0x6076  
0x4E4B  0x90FD  0x000A  0x8D44  0x6E90  0x4E0D  0x591F  0x4E0D  0x53EF  0x4EE5  
0x5EFA  0x9020  

Convert from UTF-16 to UTF-8...
lenth = 60
UTF-8 string: 
汉字
枯藤昏鸦
罪恶之都
资源不够不可以建造