diff --git a/cpp/QrCodeGeneratorWorker.cpp b/cpp/QrCodeGeneratorWorker.cpp
index b4669ba..2295593 100644
--- a/cpp/QrCodeGeneratorWorker.cpp
+++ b/cpp/QrCodeGeneratorWorker.cpp
@@ -91,11 +91,7 @@ int main() {
 					std::cout << (qr.getModule(x, y) ? 1 : 0) << std::endl;
 			}
 			
-		} catch (const std::length_error &ex) {
-			if (strcmp(ex.what(), "Data too long") != 0) {
-				std::cerr << ex.what() << std::endl;
-				return EXIT_FAILURE;
-			}
+		} catch (const qrcodegen::data_too_long &ex) {
 			std::cout << -1 << std::endl;
 		}
 		std::cout << std::flush;
diff --git a/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java b/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
index e9d7ecc..801b1b3 100644
--- a/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
+++ b/java/io/nayuki/qrcodegen/QrCodeGeneratorWorker.java
@@ -91,9 +91,7 @@ public final class QrCodeGeneratorWorker {
 					System.out.println(qr.getModule(x, y) ? 1 : 0);
 			}
 			
-		} catch (IllegalArgumentException e) {
-			if (!e.getMessage().equals("Data too long"))
-				throw e;
+		} catch (DataTooLongException e) {
 			System.out.println(-1);
 		}
 		System.out.flush();
diff --git a/python/qrcodegen-worker.py b/python/qrcodegen-worker.py
index c52548d..421b876 100644
--- a/python/qrcodegen-worker.py
+++ b/python/qrcodegen-worker.py
@@ -68,9 +68,7 @@ def main():
 				for x in range(qr.get_size()):
 					print(1 if qr.get_module(x, y) else 0)
 			
-		except ValueError as e:
-			if e.args[0] != "Data too long":
-				raise
+		except qrcodegen.DataTooLongError:
 			print(-1)
 		sys.stdout.flush()
 
diff --git a/rust/examples/qrcodegen-worker.rs b/rust/examples/qrcodegen-worker.rs
index f35ec80..a6c3ca3 100644
--- a/rust/examples/qrcodegen-worker.rs
+++ b/rust/examples/qrcodegen-worker.rs
@@ -79,7 +79,7 @@ fn main() {
 		match QrCode::encode_segments_advanced(&segs, ECC_LEVELS[errcorlvl as usize],
 				Version::new(minversion as u8), Version::new(maxversion as u8), msk, boostecl != 0) {
 		
-			Some(qr) => {
+			Ok(qr) => {
 				// Print grid of modules
 				println!("{}", qr.version().value());
 				for y in 0 .. qr.size() {
@@ -88,7 +88,7 @@ fn main() {
 					}
 				}
 			},
-			None => println!("-1"),
+			Err(_) => println!("-1"),
 		}
 		use std::io::Write;
 		std::io::stdout().flush().unwrap();