打开Windows注册表中的一个键（winapi）

huangapple
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英文:

Open a Key from Windows-Registry (winapi)

问题

  1. 你好，我尝试使用 Windows-Crate（https://crates.io/crates/windows）打开注册表键。
  3. ```rust
  4. unsafe {
  5.     let hkey: *mut HKEY = ptr::null_mut();        
  6.     let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
  7.         HKEY_LOCAL_MACHINE, 
  8.         s!("SOFTWARE"),
  9.         0 as u32,
  10.         KEY_QUERY_VALUE,
  11.         hkey
  12.     );
  13.     println!(">>> {:?}", reg_open_result);
  14.     println!(">>> {:?}", hkey);
  15. }

宏 s! 定义如下：

  1. #[macro_export]
  2. macro_rules! s {
  3.     ($s:literal) => {
  4.         $crate::core::PCSTR::from_raw(::std::concat!($s, '
    #[macro_export]
  5. macro_rules! s {
  6.     ($s:literal) => {
  7.         $crate::core::PCSTR::from_raw(::std::concat!($s, '\0').as_ptr())
  8.     };
  9. }
  10. ').as_ptr())
  11.     };
  12. }

调用它会得到 WIN32_ERROR(87)。我不知道我在这里做错了什么...

英文:

Hi i try to open a registry-key with the windows-crate (https://crates.io/crates/windows)

  1. unsafe {
  2.         let hkey: *mut HKEY = ptr::null_mut();        
  3.         let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
  4.             HKEY_LOCAL_MACHINE, 
  5.             s!("SOFTWARE"),
  6.             0 as u32,
  7.             KEY_QUERY_VALUE,
  8.             hkey
  9.         );
  10.         println!(">>> {:?}", reg_open_result);
  11.         println!(">>> {:?}", hkey);
  12. }

the macro s! is defined as follows:

  1. #[macro_export]
  2. macro_rules! s {
  3.     ($s:literal) => {
  4.         $crate::core::PCSTR::from_raw(::std::concat!($s, '
    #[macro_export]
  5. macro_rules! s {
  6. ($s:literal) => {
  7. $crate::core::PCSTR::from_raw(::std::concat!($s, '\0').as_ptr())
  8. };
  9. }
  10. ').as_ptr())
  11.     };
  12. }

Calling this gives me WIN32_ERROR(87). I have no clue what im doing wrong here...

答案1

得分: 3

您正在将一个空指针传递给RegOpenKeyExA中的phkResult。

phkResult：指向接收已打开的键的句柄的变量的指针。

因此，该变量应该位于堆栈上，并且应传递指向它的指针：

  1. unsafe {
  2.         let mut hkey = HKEY(0);
  3.         let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
  4.             HKEY_LOCAL_MACHINE, 
  5.             s!("SOFTWARE"),
  6.             0 as u32,
  7.             KEY_QUERY_VALUE,
  8.             &mut hkey
  9.         );
  10.         println!(">>> {:?}", reg_open_result);
  11.         println!(">>> {:?}", hkey);
  12. }
英文:

You're passing a null-pointer to RegOpenKeyExA in phkResult.

> phkResult: A pointer to a variable that receives a handle to the opened key.

The variable should thus live on the stack and a pointer to it should be passed:

  1. unsafe {
  2.         let mut hkey = HKEY(0);
  3.         let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
  4.             HKEY_LOCAL_MACHINE, 
  5.             s!("SOFTWARE"),
  6.             0 as u32,
  7.             KEY_QUERY_VALUE,
  8.             &mut hkey
  9.         );
  10.         println!(">>> {:?}", reg_open_result);
  11.         println!(">>> {:?}", hkey);
  12. }

huangapple
  • 本文由 发表于 2023年7月27日 22:59:47
  • 转载请务必保留本文链接：https://go.coder-hub.com/76781041.html
  • rust
  • winapi
  • windows
  • windows-rs
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