C.CString 是把 go 的 string 转换到 C 的 *char,不过这个转换不会自动释放内存,需用调用 free 释放,下面是 CString 的签名: // Go string to C string// The C string is allocated in the C heap using malloc.// It is the caller's responsibil
AI代码解释 import("reflect""unsafe")// copy from prometheus source code// NoAllocString convert []byte to stringfuncNoAllocString(bytes[]byte)string{return*(*string)(unsafe.Pointer(&bytes))}// NoAllocBytes convert string to []bytefuncNoAllocBytes(s string)[]byte{strHeader:=(*reflect.Strin...
2.2.1 使用strings.ToLower package main import ( "fmt" "strings" ) func main() { ... if strings.ToLower(srcString) == strings.ToLower(destString) { fmt.Println("Equals") } else { fmt.Println("Not Equals") } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15...
AI代码解释 pub fnmy_app_receive_string_and_return_string(s:String)->String{ifs.len()>15{// this path has new memory alloc on heaps[0..15].to_string()}else{// this path doesn't have new memory alloc on heaps}}
// The C string is allocated in the C heap using malloc. // It is the caller's responsibility to arrange for it to be // freed, such as by calling C.free (be sure to include stdlib.h // if C.free is needed). func C.CString(string) *C.char ...
} total :=0 first :=0 forn :=0; n < b.N; n++ { s := NoAllocString(buf) total +=len(s) first +=int(s[0]) } } 从测试数据的差异来看,string()转换[]byte数组,产生了拷贝。 也说明这个unsafe代码取得的性能收益还挺大的。
CString(string) *C.char // Go byte数组转换为C的数组。使用malloc分配的空间,因此需要使用C.free避免内存泄漏 func C.CBytes([]byte) unsafe.Pointer // C字符串转换为Go字符串 func C.GoString(*C.char) string // C字符串转换为Go字符串,指定转换长度 func C.GoStringN(*C.char, C.int) string...
str := C.CString("Hello from Golang") C.callBackFunc(str, C.int(42)) defer C.free(unsafe.Pointer(str)) } func main() {} bridge.go: package main /* typedef void ( *CallbackFunc_T )( char *, int ); CallbackFunc_T pCallFuncPtr = NULL; ...
string与[]byte的转换 string与slice的结构本质上是一样的,可以直接强制转换: import ( "reflect" "unsafe" ) // copy from prometheus source code // NoAllocString convert []byte to string func NoAllocString(bytes []byte) string { return *(*string)(unsafe.Pointer(&bytes)) ...
{ name := C.CString("/my_shared_memory") defer C.free(unsafe.Pointer(name)) size := C.size_t(1024) // 1KB shared memory sharedMemory := C.create_shared_memory(name, size) if sharedMemory == nil { fmt.Println("Failed to create shared memory") return } // Use the shared ...