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Adding Microsofts Macro to cast WIN32_ERROR codes into HRESULT's #34

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Adding Microsofts Macro to cast WIN32_ERROR codes into HRESULT's #34

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16 changes: 16 additions & 0 deletions win32/zig.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,22 @@ pub const PropertyKey = extern struct {
}
};

const c_cast = @import("std").zig.c_translation.cast;
/// "HRESULT From WIN32 Error Code"
/// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/0c0bcf55-277e-4120-b5dc-f6115fc8dc38
pub fn HRESULT_FROM_WIN32(x: @import("foundation.zig").WIN32_ERROR) @import("foundation.zig").HRESULT {
const err = @as(c_uint, @intFromEnum(x));
if (err <= 0) {
return c_cast(@import("foundation.zig").HRESULT, err);
} else {
return c_cast(@import("foundation.zig").HRESULT, ((err & @as(c_uint, 0x0000FFFF)) | @as(c_uint, (7 << 16)) | @as(c_uint, 0x80000000)));
}
}

test "HRESULT from WIN32_ERR" {
try testing.expectEqual(@as(i32, -2147023728), HRESULT_FROM_WIN32(@import("foundation.zig").WIN32_ERROR.ERROR_NOT_FOUND));
}

pub fn FAILED(hr: @import("foundation.zig").HRESULT) bool {
return hr < 0;
}
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