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;
}
}

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