See alsoRead a number of data items of the same type from a file and stores them in a memory buffer.
WebVue support - Yes.
Before using any of the file management instructions, except FSTAT, RENAME, UNLINK, FILETOBUF or BUFTOFILE, you must first open the file using an FOPEN instruction.
Before any program including the FOPEN instruction ends, it must execute an FCLOSE instruction.
Syntax
LongVal = FREAD(Filename, Handle, Size, N);
Return type: LONG.
|
Argument |
Meaning |
|
Filename |
The name of the file from which the data is to be read.
Type STR. |
|
Handle |
The location of the memory buffer into which the data is read. Type LONG. |
|
Size |
The size in bytes for each data item. Any numeric type. |
|
N |
The number of items to be read. Any numeric type. |
Execution
Data items are read into a memory buffer. The buffer must be previously allocated with ALLOC_BUFFER, which also supplies the handle.
Return: 1 if successful, else 0.
Example
'read 20 data items of 4 bytes
i1 = FREAD("histo.fil",handle,4,20);