我是 go 和 cgo 的新手，在瀏覽互聯網一段時間后，我還沒有想出一種從 go 中更改 char* 的好而快速的方法。從 go& 更改 *C.char 的最快方法是什么這是我的代碼和我嘗試更改字符串的嘗試（它不起作用）package asciiEngine// #include <windows.h>import "C"type Screen struct { Width, Height int Length C.ulong Data *C.char GoData string HConsole C.HANDLE BytesWritten C.DWORD Start C.COORD}func (s Screen) Draw() { C.WriteConsoleOutputCharacter(s.HConsole, s.Data, s.Length, s.Start, &s.BytesWritten)}func CreateScreen(width, height int) Screen { screen := Screen{ Width: width, Height: height, Length: C.ulong(width * height), Data: (*C.char)(C.malloc(C.ulonglong(width * height))), HConsole: C.CreateConsoleScreenBuffer(C.GENERIC_READ|C.GENERIC_WRITE, 0, nil, C.CONSOLE_TEXTMODE_BUFFER, nil), BytesWritten: 0, } screen.GoData = C.GoString(screen.Data) // my attempt to get a reference to the C string //C.SetConsoleActiveScreenBuffer(screen.HConsole) return screen}主要去：package main// #include "stdio.h"// void print(char* data) {// printf(data);// }import "C"import ( "fmt" "github.com/demantar/ascii-engine")func main() { screen := asciiEngine.CreateScreen(100, 50) C.print((*C.char)(screen.Data)) fmt.Println() screen.GoData = "askdssdfselkkskdkflsekfjdkjfksjeflsdkfjjekdjflskasdfkksdjjekdskdfjkskd" C.print((*C.char)(screen.Data))}輸出PP我對 C 也很陌生，我正在這樣做，因為我找不到一個庫來做這件事
1 回答
蝴蝶刀刀
TA貢獻1801條經驗 獲得超8個贊
例如，用作底層C數組的gDataGo切片引用。bytecDatachar
package main
import (
? ? "fmt"
? ? "unsafe"
)
/*
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int printData(unsigned char *data) {
? ? return printf("cData: %lu \"%s\"\n", (long unsigned int)strlen(data), data);
}
*/
import "C"
func main() {
? ? // Allocate C data buffer.
? ? width, height := 8, 2
? ? lenData := width * height
? ? // add string terminating null byte
? ? cData := (*C.uchar)(C.calloc(C.size_t(lenData+1), C.sizeof_uchar))
? ? // When no longer in use, free C allocations.
? ? defer C.free(unsafe.Pointer(cData))
? ? // Go slice reference to C data buffer,
? ? // minus string terminating null byte
? ? gData := (*[1 << 30]byte)(unsafe.Pointer(cData))[:lenData:lenData]
? ? // Write and read cData via gData.
? ? for i := range gData {
? ? ? ? gData[i] = '.'
? ? }
? ? copy(gData[0:], "Data")
? ? gData[len(gData)-1] = 'X'
? ? fmt.Printf("gData: %d %q\n", len(gData), gData)
? ? C.printData(cData)
}
輸出：
gData: 16 "Data...........X"
cData: 16 "Data...........X"
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