Thread: File Stream I/O

HI,

Ive got a txt file with 120 lines in it, basically all i want to do is read through each line in it (looping around) and once in that line position, check to see if it contains an "R", if it does then i want to do something!

Ive had a go at doing this, as you can see from the code below. But got an error, also shown below! Please try and help in any way you can!

Code:

//Automatic Reset
	int CountDown[120];
	int A;
	char Buf[1];
	long Dist;
	int NumRead;
	char Blank[2] = " ";
	


	while (TRUE)
	{
		Sleep(100);


		for ( A = 1; (A >= 1) && (A <= 120); A++)
		{
			
			Dist=(6 + ((A - 1) * 9));

			pnHandle = fopen(gtRESET_FILE, "r+");

			pnSize = fseek(pnHandle, Dist, SEEK_SET);

			NumRead = fread(Buf, 1, 1, pnHandle);
			

			if (Buf == "R")
			{

				CountDown[A] = 300;
				//Do Block Here, Somehow??!
				iPutEvent(A, GCEV_BLOCKED);
				fwrite(Blank, 1, 1, pnHandle);

			}


			CountDown[A]--;


			if (CountDown[A] = 0)
			{

				//Do UnBlock Here, Somehow??!
				iPutEvent(A, GCEV_UNBLOCKED);

			}

		}

	}

Error
-------------
Compiling...
EventHandler.cpp
C:\SMS\sms_c_V4\EventHandler.cpp(1121) : warning C4101: 'itemp' : unreferenced local variable
C:\SMS\sms_c_V4\EventHandler.cpp(1637) : error C2440: '=' : cannot convert from 'int' to 'struct _iobuf *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

EventHandler.obj - 1 error(s), 1 warning(s)

----------------

Thanks for any help whatsoever,




P

Ok made that little change. Thanks

Ive also added more comments to code to try and help you lot help me!

Code:

//Automatic Reset
	
	//Array to countdown the 120 lines
	int CountDown[120];
	
	int A;
	
	//Array to store read in Char
	char Buf[1];

	
	long Dist;
	int NumRead;

	//Char array containing the blank space
	char Blank[2] = " ";
	


	while (TRUE)
	{

		Sleep(100);


		for ( A = 1; (A >= 1) && (A <= 120); A++)
		{
			
			//Number of bytes from the start of file to begin reading
			Dist = (6 + ((A - 1) * 9));

			//Open the file with read & write access
			pnHandle = fopen(gtRESET_FILE, "r+");

			//ERROR POINTS HERE!!!!!
			//Move file pointer to correct position
			pnSize = fseek(pnHandle, Dist, SEEK_SET);

			//Read one byte from position and store in Buf
			NumRead = fread(Buf, 1, 1, pnHandle);
			

			//Check to see if that line needs reseting
			if (Buf == "R")
			{

				//Start countdown
				CountDown[A] = 300;

				//Block line
				iPutEvent(A, GCEV_BLOCKED);

				//Remove the "R" from the ResetFile.txt file
				fwrite(Blank, 1, 1, pnHandle);

			}

			//Decrement the value at current position in the array
			CountDown[A]--;


			//If the value at the current position in the array is zero unblock line
			if (CountDown[A] == 0)
			{

				//UnBlock line
				iPutEvent(A, GCEV_UNBLOCKED);

			}

		}

	}

ERROR
--------------------Configuration: sms_c - Win32 Debug--------------------
Compiling...
EventHandler.cpp
C:\SMS\sms_c_V4\EventHandler.cpp(1121) : warning C4101: 'itemp' : unreferenced local variable
C:\SMS\sms_c_V4\EventHandler.cpp(1650) : error C2440: '=' : cannot convert from 'int' to 'struct _iobuf *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

EventHandler.obj - 1 error(s), 1 warning(s)



Any more help anyone?

Thanks