英文:
Open a Key from Windows-Registry (winapi)
问题
你好，我尝试使用 Windows-Crate（https://crates.io/crates/windows）打开注册表键。
```rust
unsafe {
let hkey: *mut HKEY = ptr::null_mut();
let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
HKEY_LOCAL_MACHINE,
s!("SOFTWARE"),
0 as u32,
KEY_QUERY_VALUE,
hkey
);
println!(">>> {:?}", reg_open_result);
println!(">>> {:?}", hkey);
}
宏 s! 定义如下：
#[macro_export]
macro_rules! s {
($s:literal) => {
$crate::core::PCSTR::from_raw(::std::concat!($s, '#[macro_export]
macro_rules! s {
($s:literal) => {
$crate::core::PCSTR::from_raw(::std::concat!($s, '\0').as_ptr())
};
}
').as_ptr())
};
}
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)
unsafe {
let hkey: *mut HKEY = ptr::null_mut();
let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
HKEY_LOCAL_MACHINE,
s!("SOFTWARE"),
0 as u32,
KEY_QUERY_VALUE,
hkey
);
println!(">>> {:?}", reg_open_result);
println!(">>> {:?}", hkey);
}
the macro s! is defined as follows:
#[macro_export]
macro_rules! s {
($s:literal) => {
$crate::core::PCSTR::from_raw(::std::concat!($s, '#[macro_export]
macro_rules! s {
($s:literal) => {
$crate::core::PCSTR::from_raw(::std::concat!($s, '\0').as_ptr())
};
}
').as_ptr())
};
}
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：
unsafe {
let mut hkey = HKEY(0);
let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
HKEY_LOCAL_MACHINE,
s!("SOFTWARE"),
0 as u32,
KEY_QUERY_VALUE,
&mut hkey
);
println!(">>> {:?}", reg_open_result);
println!(">>> {:?}", hkey);
}
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:
unsafe {
let mut hkey = HKEY(0);
let reg_open_result = windows::Win32::System::Registry::RegOpenKeyExA(
HKEY_LOCAL_MACHINE,
s!("SOFTWARE"),
0 as u32,
KEY_QUERY_VALUE,
&mut hkey
);
println!(">>> {:?}", reg_open_result);
println!(">>> {:?}", hkey);
}
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