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encoding/binary: can Read []byte in struct directly but cant Read whole struct #10633

analogic opened this issue Apr 30, 2015 · 1 comment


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i have this code (simplified):

type Section4 struct {
    LocalUse []byte

func readSection4(f *os.File, len uint32) (section Section4, err error) {   
   section.LocalUse = make([]byte, len)

   // this will work OK
    err = binary.Read(f, binary.BigEndian, &section.LocalUse)

    // this will end with ERROR: binary.Read: invalid type []uint8
    err = binary.Read(f, binary.BigEndian, &section)
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This is behaving as documented. "Data must be a pointer to a fixed-size value or a slice of fixed-size values." Passing &section.LocalUse is a pointer to a slice of fixed-size values. Passing &section is not a pointer to a fixed-size value, because the struct contains a slice.

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