#include "sierrachart.h"  
#include <stdio.h>        
#include <stdlib.h>     
SCDLLName("ReadLineFromFile") 
SCString ReadTextFile(SCStudyInterfaceRef sc, SCString FileLocation)  
{  
    char TextBuffer[1000] = {}; // string size 1k, adjust as needed,  
    int FileHandle = 1; // File Handle cannot be just an integer numbers, has to be defined first, sc.OpenFile requires int&  
    //unsigned int *p_BytesRead = new unsigned int(0); // sc.ReadFile() requires unsigned int pointer  
    // Don't do this, it is not necessary, also, using new without a corresponding delete = memory/resource leak 
    // see edit below using address of operator (&) 
    unsigned int bytesRead{ 0 }; 
    sc.OpenFile(FileLocation.GetChars(), n_ACSIL::FILE_MODE_OPEN_EXISTING_FOR_SEQUENTIAL_READING, FileHandle);  
    sc.ReadFile(FileHandle, TextBuffer, 1000, &bytesRead); // use & operator here 
    sc.CloseFile(FileHandle);  
    return TextBuffer;  
}  
SCSFExport scsf_ReadLineFromFile(SCStudyGraphRef sc)  
{  
    SCSubgraphRef Line1 = sc.Subgraph[0];  
    SCInputRef PathAndFile = sc.Input[0];  
    if(sc.SetDefaults)  
    {  
        sc.GraphName = "Read Line Value From File"; 
        sc.StudyDescription = "Read Line Value From File";; 
        sc.DrawZeros = 0;  
        sc.AutoLoop = 0;  
        sc.GraphRegion = 0;  
        sc.ValueFormat = 4;  
        sc.CalculationPrecedence = LOW_PREC_LEVEL;      
        Line1.Name = "Line 1";  
        Line1.DrawStyle = DRAWSTYLE_LINE;  
        Line1.PrimaryColor = COLOR_CYAN;  
        Line1.DrawZeros = false;  
        PathAndFile.Name = "Path and Filename";  
        PathAndFile.SetPathAndFileName("");   
        return;  
    }  
    float& r_LineValue = sc.GetPersistentFloatFast(0); 
//    if (sc.UpdateStartIndex == 0) 
 //   { 
        r_LineValue = 0.0f; 
        SCString buffer = ReadTextFile(sc, PathAndFile.GetPathAndFileName()); 
        if (buffer.GetLength() > 0) 
        { 
            buffer = buffer.GetSubString(buffer.GetLength() - 1); 
            r_LineValue = std::strtof(buffer, nullptr); 
        } 
//    } 
    for (int index = sc.UpdateStartIndex; index < sc.ArraySize; index++) 
        Line1[index] = r_LineValue; 
}