add read

add function that makes an ioctl call to return the driver's active mouse_modifier

1 files changed, 46 insertions, 0 deletions

diff --git a/common/rawaccel-io.hpp b/common/rawaccel-io.hpp
new file mode 100644
index 0000000..5d6fad6
--- /dev/null
+++ b/common/rawaccel-io.hpp
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <system_error>
+
+#define NOMINMAX
+#include <Windows.h>
+
+#include "rawaccel.hpp"
+
+#define RA_IOCTL CTL_CODE(0x8888, 0x888, METHOD_BUFFERED, FILE_ANY_ACCESS)
+
+namespace rawaccel {
+
+	mouse_modifier read() {
+		HANDLE ra_handle = INVALID_HANDLE_VALUE;
+
+		ra_handle = CreateFileW(L"\\\\.\\rawaccel", 0, 0, 0, OPEN_EXISTING, 0, 0);
+
+		if (ra_handle == INVALID_HANDLE_VALUE) {
+			throw std::system_error(GetLastError(), std::system_category(), "CreateFile failed");
+		}
+
+		mouse_modifier mod;
+		DWORD dummy;
+
+		BOOL success = DeviceIoControl(
+			ra_handle,
+			RA_IOCTL,
+			NULL,					  // input buffer
+			0,						  // input buffer size
+			&mod,                     // output buffer
+			sizeof(mouse_modifier),   // output buffer size
+			&dummy,                   // bytes returned
+			NULL                      // overlapped structure
+		);
+
+		CloseHandle(ra_handle);
+
+		if (!success) {
+			throw std::system_error(GetLastError(), std::system_category(), "DeviceIoControl failed");
+		}
+
+		return mod;
+	}
+
+}