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// TorrentDataParse.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <stdlib.h>
#include <string.h>
#include <string>

bool IsValidInt(char * pData, int & nNum)
{
	char * pTemp = pData;

	int nState = 0;

	char c = 0;

	char buf[256] = { 0 };

	if (!pData)
		return false;

	while (*pTemp)
	{
		c = *pTemp;
		switch (nState)
		{
		case 0:
		{
			if (c != 'i')
				return false;
			nState = 1;
			break;
		}
		case 1:
		{
			if ((c == '+') || (c == '-') || ((c >= '1') && (c <= '9')))
			{
				nState = 2;
				break;
			}
			return false;
		}
		case 2:
		{
			if ((c >= '0') && (c <= '9'))
			{
				break;
			}
			if (c == 'e')
			{
				nState = 3;
				break;
			}
			return false;
		}
		case 3:
		{
			if(c)
				return false;
		}
		}
		pTemp++;
	}

	for (int i = 1; i < strlen(pData) - 1; i++)
	{
		buf[i - 1] = pData[i];
	}

	nNum = atol(buf);

	return true;
}

bool IsValidString(char * pData, std::string & strVal)
{
	int nPos = -1;
	int i = -1;
	char Num[128] = { 0 };
	char Str[256] = { 0 };
	int nNum = 0;

	for (i = 0; i < strlen(pData); i++)
	{
		if (pData[i] == ':')
		{
			nPos = i;
			break;
		}
	}
	if (nPos == -1)
		return false;

	for (i = 0; i < nPos; i++)
	{
		if (isdigit(pData[i]) == false)
			return false;

		Num[i] = pData[i];
	}

	nNum = atol(Num);

	for (i = nPos + 1; i < strlen(pData); i++)
	{
		Str[i - nPos - 1] = pData[i];
	}

	if (strlen(Str) != nNum)
		return false;

	strVal = Str;

	return true;
}


int main()
{
	std::string str;
	if (IsValidString("4:jimo", str))
	{
		printf("%s\n", str.c_str());
	}
	else
	{
		printf("invalid string\n");
	}
	if (IsValidString("4:jimo5", str))
	{
		printf("%s\n", str.c_str());
	}
	else
	{
		printf("invalid string\n");
	}

	if (IsValidString(":jimo5", str))
	{
		printf("%s\n", str.c_str());
	}
	else
	{
		printf("invalid string\n");
	}

	if (IsValidString("r4:jimo5", str))
	{
		printf("%s\n", str.c_str());
	}
	else
	{
		printf("invalid string\n");
	}

	system("pause");
    return 0;
}

运行效果如下：