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SCString ReadTextFile(SCStudyInterfaceRef sc, SCString FileLocation)
{
  char TextBuffer[320000] = {}; // string size 320k, 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
  sc.OpenFile(FileLocation.GetChars(), n_ACSIL::FILE_MODE_OPEN_EXISTING_FOR_SEQUENTIAL_READING, FileHandle);
  sc.ReadFile(FileHandle, TextBuffer, 320000, p_BytesRead);
  sc.CloseFile(FileHandle);
  return TextBuffer;
}

SCSFExport scsf_MyStudy(SCStudyInterfaceRef sc)
{

// ... other codes

static SCString MyInputString("");
// has to be static, otherwise the content will be cleared on very next loop

MyInputString.Format(ReadTextFile(sc, "C:\\SierraChart\\Data\\MyData.txt").GetSubString(ReadTextFile(sc, "C:\\SierraChart\\Data\\MyData.txt").GetLength()-1, 0));
// to remove EOF charactor

// or MyInputString.Format(ReadTextFile(sc, "C:\\SierraChart\\Data\\MyData.txt"); depend on your OS

//... other codes

}