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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"FormatException: Missing extension byte on non-English Windows","articleBody":"## Environment\nPackage: android_libcpp_shared v0.2.0\nOS: Windows 10/11 (Chinese / Japanese / Korean locale)\nDart SDK: ^3.12.0\n\n- Stack trace\n\n\n```code\nUnhandled exception:\nFormatException: Missing extension byte (at offset 1)\n#0      _Utf8Decoder.convertChunked (dart:convert-patch/convert_patch.dart:1964:7)\n#1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:313:28)\n...\n#4      _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:115:24)\n```\n\n\n- Root cause\nlib/src/process.dart lines 29–32 — runProcess() hardcodes utf8.decoder:\n\n```dart\nfinal stdoutFuture = process.stdout\n    .transform(utf8.decoder)                    // ← the problem\n    .transform(const LineSplitter())\n    .forEach(stdout.writeln);\n```\nOn non-English Windows (e.g. Chinese/Japanese/Korean locale), where.exe outputs error messages in the system code page (e.g. CP936 for Chinese), not UTF-8:\n\n\n```code\nC:\\\u003e where ndk-build.cmd\n信息: 用提供的模式无法找到文件。    ← CP936 (GBK) encoded\n```\nFor example, the Chinese character 信 is encoded as 0xD0 0xC5 in GBK. utf8.decoder sees 0xD0 as a 2-byte UTF-8 lead byte and expects the next byte in range 0x80–0xBF. But 0xC5 is not in that range → FormatException is thrown.\n\nOn English Windows the output is pure ASCII (INFO: Could not find files...) so it never triggers.\n\nReproduction\n1.Use a non-English Windows system (Chinese / Japanese / Korean locale)\n2.Do NOT have ndk-build.cmd in PATH\n3.Build any Flutter project that depends on android_libcpp_shared\n\n```cmd\nwhere ndk-build.cmd\n# Outputs localized error → Dart process crashes with FormatException\n```\nSuggested fix\nUse platform-appropriate decoder in process.dart:\n\n\n```dart\nfinal encoding = Platform.isWindows ? systemEncoding : utf8;\nfinal stdoutFuture = process.stdout\n    .transform(encoding.decoder)\n    .transform(const LineSplitter())\n    .forEach(stdout.writeln);\n// same for stderr\n```\nOr wrap the which() call with a try-catch for non-zero exit codes.","author":{"url":"https://github.com/wyq0918dev","@type":"Person","name":"wyq0918dev"},"datePublished":"2026-06-12T17:01:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/4/android_libcpp_shared/issues/4"}