如何调用 Windows DLL 方法

huangapple
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英文:

How to consume a Windows DLL method

问题

我正在尝试使用GetPhysicallyInstalledSystemMemory方法，该方法位于kernel32.dll中。

它需要一个类型为PULONGLONG的单个参数，但我不知道如何将其映射到golang变量。以下是我目前的尝试，结果显示"err: The parameter is incorrect"。

有人可以解释如何做到这一点吗？

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"syscall"
  6. )
  8. var memory uintptr
  10. func main() {
  11. 	kernel32 := syscall.NewLazyDLL("kernel32.dll")
  12. 	getPhysicallyInstalledSystemMemoryProc := kernel32.NewProc("GetPhysicallyInstalledSystemMemory")
  14. 	ret, _, err := getPhysicallyInstalledSystemMemoryProc.Call(uintptr(memory))
  15. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, return: %+v\n", ret)
  16. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, memory: %d\n", memory)
  17. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, err: %s\n", err)
  19. }
英文:

I am trying to use the GetPhysicallyInstalledSystemMemory method which is present in kernel32.dll.

It requires a single argument of the type PULONGLONG, but I have no idea how to map this into a golang variable. Here is my current attempt which results in "err: The parameter is incorrect".

Can anyone explain how to do this?

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"syscall"
  6. )
  8. var memory uintptr
  10. func main() {
  11. 	kernel32 := syscall.NewLazyDLL("kernel32.dll")
  12. 	getPhysicallyInstalledSystemMemoryProc := kernel32.NewProc("GetPhysicallyInstalledSystemMemory")
  14. 	ret, _, err := getPhysicallyInstalledSystemMemoryProc.Call(uintptr(memory))
  15. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, return: %+v\n", ret)
  16. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, memory: %d\n", memory)
  17. 	fmt.Printf("GetPhysicallyInstalledSystemMemory, err: %s\n", err)
  19. }

答案1

得分: 2

  1. PULONGLONG 参数类型翻译为 *uint64。
  2. 您必须将 memory 变量的地址转换为 unsafe.Pointer 类型，然后再转换为 uintptr。
  1. package main
  3. import (
  4.     "fmt"
  5.     "syscall"
  6.     "unsafe"
  7. )
  9. func main() {
  10.     kernel32 := syscall.NewLazyDLL("kernel32.dll")
  11.     getPhysicallyInstalledSystemMemoryProc := kernel32.NewProc("GetPhysicallyInstalledSystemMemory")
  13.     var memory uint64
  15.     ret, _, err := getPhysicallyInstalledSystemMemoryProc.Call(uintptr(unsafe.Pointer(&memory)))
  16.     fmt.Printf("GetPhysicallyInstalledSystemMemory, return: %+v\n", ret)
  17.     fmt.Printf("GetPhysicallyInstalledSystemMemory, memory: %d\n", memory)
  18.     fmt.Printf("GetPhysicallyInstalledSystemMemory, err: %s\n", err)
  19. }
英文:
  1. The PULONGLONG parameter type translates to *uint64
  2. You must cast the the address of the memory variable to the unsafe.Pointer type and then to uintptr

<!-- -->

  1. package main
  3. import (
  4.     &quot;fmt&quot;
  5.     &quot;syscall&quot;
  6. 	&quot;unsafe&quot;
  7. )
  9. func main() {
  10.     kernel32 := syscall.NewLazyDLL(&quot;kernel32.dll&quot;)
  11.     getPhysicallyInstalledSystemMemoryProc := kernel32.NewProc(&quot;GetPhysicallyInstalledSystemMemory&quot;)
  13. 	var memory uint64
  15.     ret, _, err := getPhysicallyInstalledSystemMemoryProc.Call(uintptr(unsafe.Pointer(&amp;memory)))
  16.     fmt.Printf(&quot;GetPhysicallyInstalledSystemMemory, return: %+v\n&quot;, ret)
  17.     fmt.Printf(&quot;GetPhysicallyInstalledSystemMemory, memory: %d\n&quot;, memory)
  18.     fmt.Printf(&quot;GetPhysicallyInstalledSystemMemory, err: %s\n&quot;, err)
  20. }

huangapple
  • 本文由 发表于 2017年9月12日 02:33:00
  • 转载请务必保留本文链接：https://go.coder-hub.com/46162245.html
  • go
  • windows
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