fread¶
fread reads data from a file.
- dat = fread(fh, ssType)
- dat = fread(fh, ssType, n)
- dat = fread_char(fh, n)
- dat = fread_char8(fh, n)
- dat = fread_float64(fh, n)
- dat = fread_float32(fh, n)
- dat = fread_int8(fh, n)
- dat = fread_uint8(fh, n)
- dat = fread_int16(fh, n)
- dat = fread_uint16(fh, n)
- dat = fread_int32(fh, n)
- dat = fread_uint32(fh, n)
- dat = fread_int64(fh, n)
- dat = fread_uint64(fh, n)
Return Value
dat is a scalar string, if ssType is “char” or in all other cases a real vector.
Parameters
- fh
Identifies the file.
- ssType
ssType is one of the following strings:
Value
Old Name
Meaning
“float64”
“double”
8 Bytes floating point value, fread_float64.
“float32”
“float”
(4 Bytes)
-“real48”
(6 Bytes)
“char”
“char”
2 Bytes-Unicode character, fread_char.
“char8”
“char8”
1 Byte, fread_char8, see also mem_get.
“int8”
-(1 Byte)
“uint8”
“uchar”
(1 Byte)
“int16”
“short”
(2 Bytes)
“uint16”
“ushort”
(2 Bytes)
“int32”
“int, long”
(4 Bytes)
“uint32”
“uint, ulong”
(4 Bytes)
“int64”
-(8 Bytes)
“uint64”
-(8 Bytes)
- n
n defines the number of data objects to be read. If n is not specified (or if n <= 0) the complete file will be read beginning at the current position.
Example
fh = fopen("/test.bin", "wb");
rvValues = 1:100; // 1,2,3,4,...
fwrite(fh, "short", rvValues); // writes 100 short values
fclose(fh);
fh = fopen("/test.bin", "rb");
rvValues = fread(fh, "short", 100); // reads 100 short
fclose(fh); // values
History
Version |
Description |
|---|---|
5.8.2 |
New type “char8”. |
4.2.0 |
If ssType == “char” is true the result string will not be truncated at the first 0-character. The strtrim function can be used to truncate the string at the first 0-character. |
See also
id-1864235