Support Board

#include "sierrachart.h"

SCDLLName("Test_ReadFile")

// support function

DWORD GetFileSize(const SCString& PathAndFileName){
  
  HANDLE File = CreateFile
          ( PathAndFileName
          , GENERIC_READ
          , FILE_SHARE_READ | FILE_SHARE_WRITE
          , NULL
          , OPEN_EXISTING
          , 0
          , NULL
          );
  
  if (File == INVALID_HANDLE_VALUE)
    return INVALID_FILE_SIZE;
  
  DWORD FileSize = ::GetFileSize(File, NULL);
  
  CloseHandle(File);
  
  return FileSize;
}

// main

SCSFExport scsf_Test_ReadFile(SCStudyInterfaceRef sc){

  SCString DebugMessage;
    // int/bool %d; float %f, %g, %e; string %s
    // DebugMessage.Format("caption : %d",var);
    // sc.AddMessageToLog(DebugMessage, 0);
  
  SCInputRef FullPath  = sc.Input[0];
  
  if (sc.SetDefaults){
    sc.GraphName = "Test_ReadFile";
    sc.AutoLoop = 0;
    FullPath.Name = "Full Path to Text File";
    FullPath.SetPathAndFileName("");
    return;
  }

  int FileHandle;

  bool FileOpened = sc.OpenFile
            ( FullPath.GetPathAndFileName()
            , n_ACSIL::FILE_MODE_OPEN_EXISTING_FOR_SEQUENTIAL_READING
            , FileHandle
            );
    
  if (FileOpened==false)
    return;
  
  DWORD BytesToRead = GetFileSize(FullPath.GetPathAndFileName());
  
  if (BytesToRead==INVALID_FILE_SIZE)
    return;
  
DebugMessage.Format( "BytesToRead : %d", BytesToRead );
sc.AddMessageToLog( DebugMessage, 0 );  
  
  char* Buffer;
  unsigned int* p_BytesRead;
  
  bool FileRead = sc.ReadFile
            ( FileHandle
            , Buffer
            , BytesToRead
            , p_BytesRead
            );
  
  if (FileRead==false)
    return;        // <- this executes = something is wrong with my 'sc.ReadFile' call
  
DebugMessage.Format( "Buffer : %s", Buffer ); // <- when the line above is removed this returns "(null)"
sc.AddMessageToLog( DebugMessage, 0 );
  
  sc.CloseFile(FileHandle);
}