纯Ｃ++的GUID和STR互相转换

最新推荐文章于 2025-09-17 14:44:27 发布

原创最新推荐文章于 2025-09-17 14:44:27 发布 · 894 阅读

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#c++ #函数式编程 #guid

本文介绍了两种在C++中进行GUID与字符串互相转换的方法，包括容错处理和防止非法字符导致的错误，确保转换过程的稳定性和安全性。

CONVERT_STR_2_GUID　方法一：

#define CONVERT_STR_2_GUID(cstr, stGuid) do\
{\
    swscanf_s((const wchar_t*)cstr, L"{%8x-%4x-%4x-%2x%2x-%2x%2x%2x%2x%2x%2x}",\
    &(stGuid.Data1),&(stGuid.Data2),&(stGuid.Data3),\
    &(stGuid.Data4[0]),&(stGuid.Data4[1]),&(stGuid.Data4[2]),&(stGuid.Data4[3]),\
    &(stGuid.Data4[4]),&(stGuid.Data4[5]),&(stGuid.Data4[6]),&(stGuid.Data4[7]));\
}while(0);

方法二（新）：1.在{}带空格容错处理上，2.在非法字符退出，有更好表现，不引起内容读取非法和字符非法上的出错


inline int CONVERT_STR_2_GUID(const unsigned char*cstr, GUID *pGuid)
{
	if (pGuid == NULL || cstr == NULL)return -1;
	unsigned char *pTemp = (unsigned char *)strchr( (char *)cstr,'{');
	if (pTemp == NULL )return -1;
	unsigned char *pEnd = (unsigned char *)strchr((char *)pTemp, '}');
	if (pTemp == NULL || pEnd == NULL|| pEnd-pTemp<=35)return -1;

	unsigned char *pG = (unsigned char *)pGuid;
	const int Index[16] = { /* unsigned long*/3,2,1,0,/*unsigned short*/5,4,/*unsigned short*/7,6,/*unsigned char[8]*/8,9,10,11,12,13,14,15 };

	int nGet = 0;
	while (pTemp[0] != '}'&& pTemp[1] != '}'&& pTemp[0] != '\0' && pTemp[1] != '\0')
	{
		if (pTemp[0] == '{' || pTemp[0] == '-' || pTemp[0] == ' ' || pTemp[0] == ',' || pTemp[0] == ':' || pTemp[0] == '}')
		{
			pTemp++;
			continue;
		}
		BYTE val0, val1;
		if (pTemp[0] >= '0' && pTemp[0] <= '9')
		{
			val0 = pTemp[0] - '0';
		}
		else if (pTemp[0] >= 'a' && pTemp[0] <= 'f')
		{
			val0 = pTemp[0] - 'a' + 10;
		}
		else if (pTemp[0] >= 'A' && pTemp[0] <= 'F')
		{
			val0 = pTemp[0] - 'A' + 10;
		}
		else
		{
			*pGuid = { 0 };
			return -1;
		}
		if (pTemp[1] >= '0' && pTemp[1] <= '9')
		{
			val1 = pTemp[1] - '0';
		}
		else if (pTemp[1] >= 'a' && pTemp[1] <= 'f')
		{
			val1 = pTemp[1] - 'a' + 10;
		}
		else if (pTemp[1] >= 'A' && pTemp[1] <= 'F')
		{
			val1 = pTemp[1] - 'A' + 10;
		}
		else
		{
			*pGuid = { 0 };
			return -1;
		}

		pG[Index[nGet]] = (val0 << 4) | val1;

		nGet++;
		if (nGet >= 16)break;
		pTemp++;
		if (pEnd== pTemp ||pTemp[0] == '\0' || pTemp[0] == '}')break;
		pTemp++;
	}
	if (nGet != 16)
	{
		*pGuid = { 0 };
		return -1;
	}
	return 0;
}
inline int CONVERT_GUID_2_STR( GUID *pGuid, unsigned char*cstr)
{
	if (pGuid == NULL || cstr == NULL)return -1;
	//typedef unsigned long long int uint64;
	sprintf((char*)cstr, "{%8X-%4X-%4X-%016I64x}",
		pGuid->Data1, pGuid->Data2, pGuid->Data3, *(uint64*)pGuid->Data4);
	return 0;
}