英文:
Convertion C to Golang with windows.h
问题
我想将这段代码转换成C语言，它运行得很好。
#include <windows.h>#include <stdio.h>int main() {double* mdl_G;HMODULE dll = LoadLibrary("./test_win64.dll");mdl_G = (double*)GetProcAddress(dll, "G");printf("G = %.2f", *mdl_G);return 0;}
转换成Go语言后，我尝试了以下代码，但是不起作用：
package mainimport ("log""syscall""unsafe")func main() {dll, _ := syscall.LoadDLL("./test_win64.dll")mdl_G, _ := dll.FindProc("G")real_G := (*float64)(unsafe.Pointer(&mdl_G))log.Print(*real_G)}
但是它不起作用。有什么建议吗？
谢谢。
英文:
I want to convert this code in C, that works pretty well
#include <windows.h>void main() {double* mdl_G;void* dll = LoadLibrary("./test_win64.dll");mdl_G = ((double*)GetProcAddress(dll, "G"));printf("G = %.2f",*mdl_G);}
to GoLang. I just tried this tip, but doesn`t work:
func main() {dll, _ := syscall.LoadDLL("./test_win64.dll")mdl_G, _ := syscall.GetProcAddress(dll.Handle, "G")real_G := (*float64)(unsafe.Pointer(&mdl_G))log.Print(*real_G)}
But doesnt work.
Any suggestions?
Thanks
答案1
得分: 0
错误是在不安全指针中的&运算符。
方法GetProcAddress已经返回一个uintptr。
func main() {dll, _ := syscall.LoadDLL("./test_win64.dll")mdl_G, _ := syscall.GetProcAddress(dll.Handle, "G")real_G := (*float64)(unsafe.Pointer(mdl_G)) // 这个转换是安全的。log.Print(*real_G)}
Go vet将报告可能的函数误用。但是，根据允许将uintptr转换为指向非Go内存的unsafe.Pointer #58625，这是正确的。
英文:
The error is & operator in unsafe pointer.
The method GetProcAddress already return a uintptr.
func main() {dll, _ := syscall.LoadDLL("./test_win64.dll")mdl_G, _ := syscall.GetProcAddress(dll.Handle, "G")real_G := (*float64)(unsafe.Pointer(mdl_G)) // this conversion is safe.log.Print(*real_G)}
Go vet will reports a possible misuse of function. But, that is correct according: allow conversion of uintptr to unsafe.Pointer when it points to non-Go memory #58625
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