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Change the RegisterClass code.

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Prevents an issue when creating multiple contexts.
This commit is contained in:
Tomaka17 2014-08-01 23:12:46 +02:00
parent d93cea808d
commit c1ecc06baf
1 changed files with 26 additions and 23 deletions
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49
src/win32/init.rs
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@ -31,30 +31,33 @@ pub fn new_window(dimensions: Option<(uint, uint)>, title: &str,
// This is the only safe method. Using `nosend` wouldn't work for non-native runtime.
TaskBuilder::new().native().spawn(proc() {
// registering the window class
let class_name: Vec<u16> = "Window Class".utf16_units().collect::<Vec<u16>>()
.append_one(0);
let class = ffi::WNDCLASSEX {
cbSize: mem::size_of::<ffi::WNDCLASSEX>() as ffi::UINT,
style: ffi::CS_HREDRAW | ffi::CS_VREDRAW,
lpfnWndProc: callback,
cbClsExtra: 0,
cbWndExtra: 0,
hInstance: unsafe { ffi::GetModuleHandleW(ptr::null()) },
hIcon: ptr::mut_null(),
hCursor: ptr::mut_null(),
hbrBackground: ptr::mut_null(),
lpszMenuName: ptr::null(),
lpszClassName: class_name.as_ptr(),
hIconSm: ptr::mut_null(),
};
let class_name = {
let class_name: Vec<u16> = "Window Class".utf16_units().collect::<Vec<u16>>()
.append_one(0);
let class = ffi::WNDCLASSEX {
cbSize: mem::size_of::<ffi::WNDCLASSEX>() as ffi::UINT,
style: ffi::CS_HREDRAW | ffi::CS_VREDRAW,
lpfnWndProc: callback,
cbClsExtra: 0,
cbWndExtra: 0,
hInstance: unsafe { ffi::GetModuleHandleW(ptr::null()) },
hIcon: ptr::mut_null(),
hCursor: ptr::mut_null(),
hbrBackground: ptr::mut_null(),
lpszMenuName: ptr::null(),
lpszClassName: class_name.as_ptr(),
hIconSm: ptr::mut_null(),
};
if unsafe { ffi::RegisterClassExW(&class) } == 0 {
use std::os;
tx.send(Err(format!("RegisterClassEx function failed: {}",
os::error_string(os::errno() as uint))));
return;
}
// We ignore errors because registering the same window class twice would trigger
// an error, and because errors here are detected during CreateWindowEx anyway.
// Also since there is no weird element in the struct, there is no reason for this
// call to fail.
unsafe { ffi::RegisterClassExW(&class) };
class_name
};
// building a RECT object with coordinates
let mut rect = ffi::RECT {