为SQLite3提供一个ANSI到UTF8的互转函数

    在使用Sqlite3时必须要用到的
    使用方法:
    char* src = "...";//待转换的ANSI或UTF8字符串
    char* dst = NULL;//保存由函数内部分配的内存指针, 不需要传入内存缓冲区的
    转换为UTF-8:to_utf8(src, &dst);
    转换为ANSI:to_gb(src, &dst);
    返回值:零 - 失败, 非零 - 成功.
    注意:如果操作成功, 需要手动释放函数内部分配的空间:
    复制代码 代码如下:
    if(dst)
    {
        free(dst);
        dst = NULL;
    }
    代码:
    复制代码 代码如下:
    #include <windows.h>
    #include <stdio.h>int to_utf8(char* psrc, char** ppdst)
    {
        int ret,ret2;
        wchar_t* pws = NULL;
        char* putf = NULL;
        ret = MultiByteToWideChar(CP_ACP, 0, psrc, -1, NULL, 0);
        if(ret<=0){
            *ppdst = NULL;
            return 0;
        }
        pws = (wchar_t*)malloc(ret*2);
        if(!pws){
            *ppdst = NULL;
            return 0;
        }
        MultiByteToWideChar(CP_ACP, 0, psrc, -1, pws, ret);
        ret2 = WideCharToMultiByte(CP_UTF8, 0, pws, -1, NULL, 0, NULL, NULL);
        if(ret2<=0){
            free(pws);
            return 0;
        }
        putf = (char*)malloc(ret2);
        if(!putf){
            free(pws);
            return 0;
        }
        if(WideCharToMultiByte(CP_UTF8, 0, pws, ret, putf, ret2, NULL, NULL)){
            *ppdst = putf;
            free(pws);
            return 1;
        }else{
            free(pws);
            free(putf);
            *ppdst = NULL;
            return 0;
        }
    }
    int to_gb(char* psrc, char** ppdst)
    {
        int ret, ret2;
        wchar_t* pws = NULL;
        char* pgb = NULL;
        ret = MultiByteToWideChar(CP_UTF8, 0, psrc, -1, NULL, 0);
        if(ret<=0){
            *ppdst = NULL;
            return 0;
        }
        pws = (wchar_t*)malloc(ret*2);
        if(!pws){
            *ppdst = NULL;
            return 0;
        }
        MultiByteToWideChar(CP_UTF8, 0, psrc, -1, pws, ret);
        ret2 = WideCharToMultiByte(CP_ACP, 0, pws, -1, NULL, 0, NULL, NULL);
        if(ret2<=0){
            free(pws);
            return 0;
        }
        pgb = (char*)malloc(ret2);
        if(!pgb){
            free(pws);
            *ppdst = NULL;
            return 0;
        }
        if(WideCharToMultiByte(CP_ACP, 0, pws, -1, pgb, ret2, NULL, NULL)){
            *ppdst = pgb;
            free(pws);
            return 1;
        }else{*ppdst = 0;
            free(pgb);
            free(pws);
            return 0;
        }
    }
    by: 女孩不哭