英文:
Using Matlab DLL in Go instead Python
问题
我正在使用由Matlab Simulink/Codegen生成的DLL模型。
这段代码在Python中运行得很好：
import ctypes
real_T = ctypes.c_double
# 导入DLL
dll = ctypes.windll.LoadLibrary("./simulink.dll")
# 模拟
dll.initialize() # 初始化
for i in range(10):
mdlInput = real_T.in_dll(dll, "my_custom_input")
mdlInput.value = i
# 步进
dll.step() # 步进
# 获取输出
mdlOutput = real_T.in_dll(dll, "my_custom_output")
print(mdlOutput.value)
dll.terminate() # 结束模拟
我只想将上面的代码翻译成Go语言以提高性能。问题是syscall.syscall不识别real_T (C.Double)类型，无法返回double而不是指针。
在Go语言中如何设置"my_custom_input"的值并读取"my_custom_output"的值？
英文:
I'm using a DLL model generated by Matlab Simulink/Codegen.
The code works pretty well in Python:
import ctypes
real_T = ctypes.c_double
# Importa a DLL
dll = ctypes.windll.LoadLibrary("./simulink.dll")
# Simulate
dll.initialize() # Init
for i in range(10):
mdlInput = (real_T).in_dll(dll, "my_custom_input")
mdlInput.value = i
# Step
dll.step() # step
# get output
mdlOutput = (real_T).in_dll(dll, "my_custom_output")
print(mdlOutput.value)
dll.terminate() # end of simulation
I just want to translate the code above to Go to increase performance. The problem is that syscall.syscall does not recognize the real_T (C.Double) type to return a double instead of a pointer.
How do I set the "my_custom_input" value and read the "my_custom_output" value in Go?
答案1
得分: 1
刚刚发现了一种使用LazyDll的新解决方案。
完整的代码如下：
package main
import (
"log"
"syscall"
"unsafe"
)
func main() {
dll := syscall.NewLazyDLL(".\\simulink.dll") // 使用LazyDll加载DLL
dll.NewProc("initialize").Call() // 调用DLL中的initialize方法
// 现在获取自定义输入的指针
customInput := (*float64)(unsafe.Pointer(dll.NewProc("my_custom_input").Addr()))
// 更新自定义输入的值
*customInput = 1.23
// 调用DLL中的step方法
dll.NewProc("step").Call() // 调用DLL中的step方法
// 现在获取自定义输出的指针并显示其值
customOutput := (*float64)(unsafe.Pointer(dll.NewProc("my_custom_output").Addr()))
// 打印输出的值
log.Print(*customOutput)
// 终止DLL的执行
dll.NewProc("terminate").Call() // 调用DLL中的terminate方法
}
以上是要翻译的内容。
英文:
Just found a new solution using LazyDll.
The complete code as:
package main
import (
"log"
"syscall"
"unsafe"
)
func main() {
dll = syscall.NewLazyDLL(".\\simulink.dll") // Load DLL as LazyDll
dll.NewProc("initialize").Call() // Call initialize method from dll
// Now get pointer to custom input
customInput := (*float64)(unsafe.Pointer(dll.NewProc("my_custom_input").Addr()))
// Update custom Input Value
*customInput := 1.23
// Call the step method from dll
dll.NewProc("step").Call() // Call step method from dll
// Now get pointer to custom output and show it's value
customOutput := (*float64)(unsafe.Pointer(dll.NewProc("my_custom_output").Addr()))
// Print the value of output
log.Print(*customOutput)
// Terminate the dll execution
dll.NewProc("terminate").Call() // Call terminate method from dll
}
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