Proc macro preparation

simconnect-sdk/src/macros.rs

@@ -0,0 +1,29 @@
+macro_rules! success {
+    ($hr:expr) => {{
+        let hr = $hr;
+        if hr != 0 {
+            return Err(SimConnectError::SimConnectError(hr));
+        }
+    }};
+}
+pub(crate) use success;
+
+macro_rules! ok_if_fail {
+    ($hr:expr, $ret:expr) => {{
+        let hr = $hr;
+        let ret = $ret;
+        if hr != 0 {
+            return Ok(ret);
+        }
+    }};
+}
+pub(crate) use ok_if_fail;
+
+macro_rules! as_c_string {
+    ($target:expr) => {
+        std::ffi::CString::new($target)
+            .map_err(|_| SimConnectError::UnexpectedError("failed to create CString".to_string()))?
+            .as_ptr()
+    };
+}
+pub(crate) use as_c_string;