c++问题

[T-Mac]

我有个C++的问题在linux底下。
我需要读文件（文件其实是matrix）比如：
1 2 1
3 2 1
3 1 2

P1）我已经把每行弄成string了。用atoi()不太好使。大家有什么建议或连接可以参考。

P2）c++里std exception里能handle non-existing file exception?每次我开一个non-existing file它都试着建一个，这个问题不是太重要不过想知道下。
在c 里可以用 ios::nocreate flag 阻止。不知道c++怎么办。自己写function handle?

谢谢任何建议。

 

[苦逼热狗]

希望对你有用

void LoadHenna()
{
	FILE *stream;
	int i;
	LPHENNA aHenna;
	stream = fopen( "henna.txt", "r" );
	
	aHenna = (LPHENNA)GlobalAlloc(GMEM_ZEROINIT, sizeof(HENNA));
	HennaTable.push_back(aHenna);

	i = 0;
	while (!feof(stream))
	{
		aHenna = (LPHENNA)GlobalAlloc(GMEM_ZEROINIT, sizeof(HENNA));
		fscanf(stream, 
			"henna_begin\t%d\tdye_id=%d\tdye_amount=%d\trefund=%d\tdraw_price=%d\tremove_price=%d\tint=%d\tstr=%d\tcon=%d\tmen=%d\tdex=%d\twit=%d\thenna_end\n",
						&(aHenna->symbol_id),
						&(aHenna->dye_id),
						&(aHenna->dye_amount),
						&(aHenna->refund),
						&(aHenna->drawprice),
						&(aHenna->removeprice),
						&(aHenna->inn),
						&(aHenna->str),
						&(aHenna->con),
						&(aHenna->mem),
						&(aHenna->dex),
						&(aHenna->wit));
		if (aHenna->symbol_id == 0)
		{
			Print(0x18AA81D8, 2, L"Parser HennaTable ERR :[%d]", i);
			GlobalFree(aHenna);
			break;
		}
		HennaTable.push_back(aHenna);
		i++;
	}
	fclose( stream );
	stream = NULL;
	Print(0x18AA81D8, 0, L"g_HennaTable Created ... [%d] Hennas", HennaTable.size() - 1);
}

			pch = strpbrk(buffer, ";");
			if (pch != NULL)
			{
				while (pch != NULL)
				{
					itemCount++;
					pch = strpbrk (pch+1,";");
				}
				//Print2(0x18AA81D8, 2, "[%d]", itemCount);
				pch = buffer + 1;
				for (int j=0;j<itemCount;j++)
				{
					sscanf(pch, "%d", &hennaid);
					aHennaTree->symbolids->push_back(hennaid);
					aHennaTree->dyeids->push_back(HennaTable.at(hennaid)->dye_id);
					pch = strstr (pch,";") + 1;
				}
			}

 

[T-Mac]

i did not try strpbrk but i tried strtok(sentence, " \n");
doesnot look nice . i will think about your code. thanks for your help.

 

[T-Mac]

已经搞定。费了半天劲用stringstream就行了，然后一转成int，唉~~~。不过还是谢谢热狗同学。^_*

不过谁能解释下第2个问题？

 

[demf]

用ifstream,只读不写的流.

用ifstream,只读不写的流.

 

[LGers]

如果是linux，可以试试QT。
这些东西QString, QStringList, QFile可能一句话就能办到。

 

[newer]

I have code to handle your first problem. I will post it on Monday.
P2: do you use C++ or C code to open a file? If your code does not use Qt, you'd better not use Qt since you need to install it. For commercial use, you need to buy license.

 

[newer]

The following code is better than atoi() because atoi() does not work well if input string is not int.

bool string2Int( const char * const value_str, int & value )
{
if ( value_str == 0 )
{
return false;
}

char othercrap = '.';
if ( sscanf( value_str, "%d %c", &value, &othercrap ) == 1 )
{
return true;
}

return false;
}