FileToArray or readline to read a file and show the information in a textbox

Question

CVI I am a beginner and have some basic questions.
Currently I am using CVI 2009th
I want to open a file and transform it into another format. The most important information to be displayed on the GUI.
For text output, I use the textbox.
With readline everything has worked, but for my data rows rather is impractical.
That's why I tried the same with FileToArray. But the array does not display in the text box.
I just do not know exactly how the textbox works. Does the textbox made a formfeed after a certain number of characters? Or I can write text in succession away?
 Here are a few lines from my code.
// FileToArray  FileToArray (pathname, &fcsLine, VAL_CHAR, fcsfile_numberofelements, 1, VAL_GROUPS_TOGETHER, VAL_GROUPS_AS_ROWS, VAL_ASCII);
// What is the right way to diplay text with filetoarray?
SetCtrlVal (tabPanelINFO, TABINFO_FCS_VERSION, fcsLine);
InsertTextBoxLine(tabPanelFCS, TABFCS_FCSBOX, -1, fcsLine);  // ReadLine while (ReadLine (fcsfile_open, fcsLine, fcsfile_numberofelements) >= 0)
{ InsertTextBoxLine(tabPanelFCS, TABFCS_FCSBOX, -1, fcsLine); } 
Solved!
Go to Solution.

Answer 1

Ok, so you are dealing with bynary data to read from the file. First of all, the post you linked refers to FileToArray () function, an I/O function which opens a file, reads its content in memory and closes it. It is basically different from ReadLine or ScanFile functions: ArrayToFile is useful to read files with numeric data only, which is not your case.
On the other hand, ReadLine actually reads file content into a string, without splitting it into data fields. On the data you have posted, ReadLine will read the entire field into a single string, since inside the data no linefeed is present. It will be up to you to extract from the string the values you need. It is possibly not the best approach...
Another option can be to read directly from binary format into memory, defining an appropriate datatype to read in file content. I don't know FDS file format (which of them is? ) so I made a rough trial to describe the data structure: knowing the exact data format you will be able to define the appropriate structure; the result will be something like that:
typedef struct {
   char   type[3];
   char   version[7];
   char   n1[32][8];
   char   header[95];
   char   data[291];
 }  fds_format;
fds_format s;
fH = fopen ("c:\\FCS file.fcs", "rb");
fread ((char *)&s, sizeof(fds_format), 1, fH);
fclose (fH);
My attempt correctly scans all (hypothetic ) fields in text section, doing nothing in the binary section which is simply read int 'data' field.
I understand that this is not so simple to understand: I will be glad to clarify your doubts if any.
Message Edited by Roberto Bozzolo on 02-12-2010 05:31 PM
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