我有這個 C 代碼:uint8_t *data[BUF_SIZE];data = ...;// extern void goReadData(uint8_t *data, int bufferSize);goReadData(data, BUF_SIZE)在 GO 代碼中,我試圖將data指針用作 GO 數組或切片,我想從 *C.uint8_t 中檢索一個 []uint8。我知道尺寸data//export goReadDatafunc goReadData(data *C.uint8_t, bufferSize C.int) { fmt.Printf("Data type %v\n", reflect.TypeOf(data)) // print 1: Data type *main._Ctype_uchar // Solution 1: GoBytes // works but really slow (memory copy I think) goBytes := C.GoBytes(unsafe.Pointer(data), bufferSize) fmt.Printf("goBytes type %v\n", reflect.TypeOf(goBytes)) // print 2: goBytes type []uint8 // Solution 2: direct pointer // Really fast, but wrong type at the end // unsafe.Pointer to the C array unsafePtr := unsafe.Pointer(data) // convert unsafePtr to a pointer of the type *[1 << 30]C.uint8_t arrayPtr := (*[1 << 30]C.uint8_t)(unsafePtr) // slice the array into a Go slice, with the same backing array // as data, making sure to specify the capacity as well as // the length. length := int(bufferSize) slice := arrayPtr[0:length:length] fmt.Printf("Direct slice type %v\n", reflect.TypeOf(slice)) //Print 3: Direct type []main._Ctype_uchar}我該怎么做才能[]uint8用第二種解決方案恢復 an 而不是 []main._Ctype_uchar?或者您是否有另一種解決方案可以在沒有字節副本的情況下做到這一點?
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慕神8447489
TA貢獻1780條經驗 獲得超1個贊
抱歉,我發現了自己的錯誤:
// convert unsafePtr to a pointer of the type *[1 << 30]C.uint8_t arrayPtr := (*[1 << 30]C.uint8_t)(unsafePtr)
==>到
// convert unsafePtr to a pointer of the type *[1 << 30]uint8 arrayPtr := (*[1 << 30]uint8)(unsafePtr)
問題解決了!
謝謝 ;)
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