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Reading a few chars from FileStream

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Join Date: Sep 2003

Posts: 6

Reputation: Daywalker46410 is an unknown quantity at this point

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Daywalker46410 Daywalker46410 is offline

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Reading a few chars from FileStream

Nov 1st, 2003

I have a simple program that has retreived the first number of a 12 number set from a text file. I am trying to convert this character array into a double or float so I can work with it, but none of the conversions are working. Anyone have any suggestions how I can do this? My code is posted below.

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String * strFilename = "c:/points";
	__wchar_t chrCoords __gc[] = new __wchar_t __gc[5];
	if (!File::Exists(strFilename))
	{
		Console::WriteLine(S"File not found.  Exiting...");
		return -1;
	}
 
	try
	{
		FileStream* fs = new FileStream(strFilename, FileMode::Open);
		StreamReader* sr = new StreamReader(fs);
 
		sr->ReadBlock(chrCoords, 1, 4);
		Console::WriteLine(chrCoords);
		float fltX = chrCoords;
		Console::WriteLine(fltX);
	}
	catch(System::Exception* ExErr)
	{
		Console::WriteLine(ExErr->ToString());
	}
String * strFilename = "c:/points";
	__wchar_t chrCoords __gc[] = new __wchar_t __gc[5];
	if (!File::Exists(strFilename))
	{
		Console::WriteLine(S"File not found.  Exiting...");
		return -1;
	}

	try
	{
		FileStream* fs = new FileStream(strFilename, FileMode::Open);
		StreamReader* sr = new StreamReader(fs);

		sr->ReadBlock(chrCoords, 1, 4);
		Console::WriteLine(chrCoords);
		float fltX = chrCoords;
		Console::WriteLine(fltX);
	}
	catch(System::Exception* ExErr)
	{
		Console::WriteLine(ExErr->ToString());
	}

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Join Date: Sep 2003

Posts: 81

Reputation: Valmian is an unknown quantity at this point

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Valmian

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Junior Poster in Training

Re: Reading a few chars from FileStream

Nov 1st, 2003

um.. are you using C# or something? Anyways in C stdlib library there is a function that can do what you want.
sscanf() the name is.
An example of its use would be
sscanf (string,"%f",float); It will take the first float from the string provided on the left and put its value into the float variable provided on the right.