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t-string.go
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/
t-string.go
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//----------------------------------------
//
// Copyright © yanghy. All Rights Reserved.
//
// Licensed under Apache License Version 2.0, January 2004
//
// https://www.apache.org/licenses/LICENSE-2.0
//
//----------------------------------------
// energy => pascal string
// 字符串引用, 用于在取string时字节指针失效
package cef
import (
"github.com/energye/energy/v2/cef/internal/def"
"github.com/energye/energy/v2/common/imports"
"unsafe"
)
// TString
// Pointer reference
type TString struct {
instance unsafe.Pointer
}
// IsValid
// return true if created
func (m *TString) IsValid() bool {
if m == nil || m.instance == nil {
return false
}
return true
}
// Value
// get string pointer, string length
// bytes copy
func (m *TString) Value() string {
if !m.IsValid() {
return ""
}
var v uintptr
s, _, _ := imports.Proc(def.TString_GetValue).Call(m.Instance(), uintptr(unsafe.Pointer(&v)))
if v != 0 && s > 0 {
str := make([]byte, s)
for i := 0; i < int(s); i++ {
str[i] = *(*byte)(unsafe.Pointer(v + uintptr(i)))
}
return string(str)
}
return ""
}
// Free
// Destroy this reference
func (m *TString) Free() {
if !m.IsValid() {
return
}
var instance = m.Instance()
imports.Proc(def.TString_Free).Call(uintptr(unsafe.Pointer(&instance)))
m.instance = nil
}
// Instance
// return string value pointer
func (m *TString) Instance() uintptr {
return uintptr(m.instance)
}
// NewTString
// 创建一个 TString pointer reference
func NewTString() *TString {
var result uintptr
imports.Proc(def.TString_Create).Call(uintptr(unsafe.Pointer(&result)))
return &TString{instance: unsafe.Pointer(result)}
}