php小編柚子在golang中，使用method.Call方法呼叫函數時，對於數字類型參數可能會遇到一些問題。但是，我們可以採用一些方法來解決這個問題。首先，我們可以將數字類型轉換為對應的reflect.Value類型，然後再傳遞給method.Call方法。另外，我們也可以使用反射方法來取得函數的參數類型，並根據參數類型進行對應的處理。總之，透過這些方法，我們可以使數字類型適合golang中的method.Call方法的調用，從而解決這個問題。
問題內容
程式碼圍棋遊樂場：
package main
import (
"fmt"
"reflect"
)
func (s StructWithManyMethods) Func1(a int, b uint, c float64) {
fmt.Printf("func:Func1 a:%d b:%d c:%f \n", a, b, c)
}
func (s StructWithManyMethods) Func2(a string, b int, c int, d int) {
fmt.Printf("func:Func2 a:%s b:%d c:%d d:%d\n", a, b, c, d)
}
type StructWithManyMethods struct {
}
func (s StructWithManyMethods) CallMethod(n string, p []interface{}) {
method := reflect.ValueOf(s).MethodByName(n)
methodType := method.Type()
for i := 0; i < methodType.NumIn(); i++ {
in := methodType.In(i)
switch in.Kind() {
case reflect.Float32:
switch v := p[i].(type) {
case float64:
p[i] = float32(v)
case float32:
p[i] = float32(v)
case int:
p[i] = float32(v)
case uint:
p[i] = float32(v)
case int8:
p[i] = float32(v)
case uint8:
p[i] = float32(v)
case int16:
p[i] = float32(v)
case uint16:
p[i] = float32(v)
case int32:
p[i] = float32(v)
case uint32:
p[i] = float32(v)
case int64:
p[i] = float32(v)
case uint64:
p[i] = float32(v)
}
case reflect.Float64:
switch v := p[i].(type) {
case float64:
p[i] = float64(v)
case float32:
p[i] = float64(v)
case int:
p[i] = float64(v)
case uint:
p[i] = float64(v)
case int8:
p[i] = float64(v)
case uint8:
p[i] = float64(v)
case int16:
p[i] = float64(v)
case uint16:
p[i] = float64(v)
case int32:
p[i] = float64(v)
case uint32:
p[i] = float64(v)
case int64:
p[i] = float64(v)
case uint64:
p[i] = float64(v)
}
case reflect.Int:
switch v := p[i].(type) {
case float64:
p[i] = int(v)
case float32:
p[i] = int(v)
case int:
p[i] = int(v)
case uint:
p[i] = int(v)
case int8:
p[i] = int(v)
case uint8:
p[i] = int(v)
case int16:
p[i] = int(v)
case uint16:
p[i] = int(v)
case int32:
p[i] = int(v)
case uint32:
p[i] = int(v)
case int64:
p[i] = int(v)
case uint64:
p[i] = int(v)
}
case reflect.Uint:
switch v := p[i].(type) {
case float64:
p[i] = uint(v)
case float32:
p[i] = uint(v)
case int:
p[i] = uint(v)
case uint:
p[i] = uint(v)
case int8:
p[i] = uint(v)
case uint8:
p[i] = uint(v)
case int16:
p[i] = uint(v)
case uint16:
p[i] = uint(v)
case int32:
p[i] = uint(v)
case uint32:
p[i] = uint(v)
case int64:
p[i] = uint(v)
case uint64:
p[i] = uint(v)
}
case reflect.Int8:
switch v := p[i].(type) {
case float64:
p[i] = int8(v)
case float32:
p[i] = int8(v)
case int:
p[i] = int8(v)
case uint:
p[i] = int8(v)
case int8:
p[i] = int8(v)
case uint8:
p[i] = int8(v)
case int16:
p[i] = int8(v)
case uint16:
p[i] = int8(v)
case int32:
p[i] = int8(v)
case uint32:
p[i] = int8(v)
case int64:
p[i] = int8(v)
case uint64:
p[i] = int8(v)
}
case reflect.Uint8:
switch v := p[i].(type) {
case float64:
p[i] = uint8(v)
case float32:
p[i] = uint8(v)
case int:
p[i] = uint8(v)
case uint:
p[i] = uint8(v)
case int8:
p[i] = uint8(v)
case uint8:
p[i] = uint8(v)
case int16:
p[i] = uint8(v)
case uint16:
p[i] = uint8(v)
case int32:
p[i] = uint8(v)
case uint32:
p[i] = uint8(v)
case int64:
p[i] = uint8(v)
case uint64:
p[i] = uint8(v)
}
case reflect.Int16:
switch v := p[i].(type) {
case float64:
p[i] = int16(v)
case float32:
p[i] = int16(v)
case int:
p[i] = int16(v)
case uint:
p[i] = int16(v)
case int8:
p[i] = int16(v)
case uint8:
p[i] = int16(v)
case int16:
p[i] = int16(v)
case uint16:
p[i] = int16(v)
case int32:
p[i] = int16(v)
case uint32:
p[i] = int16(v)
case int64:
p[i] = int16(v)
case uint64:
p[i] = int16(v)
}
case reflect.Uint16:
switch v := p[i].(type) {
case float64:
p[i] = uint16(v)
case float32:
p[i] = uint16(v)
case int:
p[i] = uint16(v)
case uint:
p[i] = uint16(v)
case int8:
p[i] = uint16(v)
case uint8:
p[i] = uint16(v)
case int16:
p[i] = uint16(v)
case uint16:
p[i] = uint16(v)
case int32:
p[i] = uint16(v)
case uint32:
p[i] = uint16(v)
case int64:
p[i] = uint16(v)
case uint64:
p[i] = uint16(v)
}
case reflect.Int32:
switch v := p[i].(type) {
case float64:
p[i] = int32(v)
case float32:
p[i] = int32(v)
case int:
p[i] = int32(v)
case uint:
p[i] = int32(v)
case int8:
p[i] = int32(v)
case uint8:
p[i] = int32(v)
case int16:
p[i] = int32(v)
case uint16:
p[i] = int32(v)
case int32:
p[i] = int32(v)
case uint32:
p[i] = int32(v)
case int64:
p[i] = int32(v)
case uint64:
p[i] = int32(v)
}
case reflect.Uint32:
switch v := p[i].(type) {
case float64:
p[i] = uint32(v)
case float32:
p[i] = uint32(v)
case int:
p[i] = uint32(v)
case uint:
p[i] = uint32(v)
case int8:
p[i] = uint32(v)
case uint8:
p[i] = uint32(v)
case int16:
p[i] = uint32(v)
case uint16:
p[i] = uint32(v)
case int32:
p[i] = uint32(v)
case uint32:
p[i] = uint32(v)
case int64:
p[i] = uint32(v)
case uint64:
p[i] = uint32(v)
}
case reflect.Int64:
switch v := p[i].(type) {
case float64:
p[i] = int64(v)
case float32:
p[i] = int64(v)
case int:
p[i] = int64(v)
case uint:
p[i] = int64(v)
case int8:
p[i] = int64(v)
case uint8:
p[i] = int64(v)
case int16:
p[i] = int64(v)
case uint16:
p[i] = int64(v)
case int32:
p[i] = int64(v)
case uint32:
p[i] = int64(v)
case int64:
p[i] = int64(v)
case uint64:
p[i] = int64(v)
}
case reflect.Uint64:
switch v := p[i].(type) {
case float64:
p[i] = uint64(v)
case float32:
p[i] = uint64(v)
case int:
p[i] = uint64(v)
case uint:
p[i] = uint64(v)
case int8:
p[i] = uint64(v)
case uint8:
p[i] = uint64(v)
case int16:
p[i] = uint64(v)
case uint16:
p[i] = uint64(v)
case int32:
p[i] = uint64(v)
case uint32:
p[i] = uint64(v)
case int64:
p[i] = uint64(v)
case uint64:
p[i] = uint64(v)
}
}
}
parameterValues := make([]reflect.Value, 0)
for _, e := range p {
parameterValues = append(parameterValues, reflect.ValueOf(e))
}
method.Call(parameterValues)
}
func main() {
var s StructWithManyMethods
s.CallMethod("Func1", []interface{}{1.0, 2.0, 3})
s.CallMethod("Func2", []interface{}{"test", 1, 2, 3.0})
}登入後複製
輸出：
func:Func1 a:1 b:2 c:3.000000
func:Func2 a:test b:1 c:2 d:3
登入後複製
因為我需要動態呼叫方法，但是參數來自不同的資料格式，這就導致需要轉換數值類型。例如，在Golang中解析JSON時，不確定的數字類型被視為float64，儘管它可能應該是int。
程式碼看起來很糟糕，但運作良好。
我想知道是否有更好的方法來做到這一點。
解決方法
使用reflect API 轉換值。
func (s StructWithManyMethods) CallMethod(n string, p []interface{}) error {
method := reflect.ValueOf(s).MethodByName(n)
methodType := method.Type()
parameterValues := make([]reflect.Value, methodType.NumIn())
if len(p) < len(parameterValues) {
return fmt.Errorf("expected %d parameters, got %d", len(parameterValues), len(p))
}
for i := range parameterValues {
in := methodType.In(i)
v := reflect.ValueOf(p[i])
if !v.CanConvert(in) {
return fmt.Errorf("cannot convert p[%d] from %s to %s", i, v.Type(), in)
}
parameterValues[i] = reflect.ValueOf(p[i]).Convert(in)
}
method.Call(parameterValues)
return nil
}登入後複製
為了防止出現恐慌，此程式碼在轉換之前檢查是否允許轉換。
在 PlayGround 上執行程式碼！
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