从2.10之后的版本，flutter已经正式支持构建Windows应用。不过距离实现全平台构建，还需要考虑很多问题，flutter构建的应用更加适合移动端的使用习惯，如果需要构建Windows应用，我的建议是使用一些适合桌面端的widget。
具体方法如下：
条件
- 需要安装Visual Studio 2019或者Visual Studio 2022，简言之，需要安装Windows 10 SDK。
- 2.10之前的版本是默认关闭的。Linux和Mac是默认关闭的，可以手动进行打开。
方法
1. 打开Windows的平台支持
PowerShell输入如下指令（如下命令可以使用flutter config查看，2.10以上的版本默认开启）
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flutter config --enable-windows-desktop # 其他平台 flutter config --[no-]enable-macos-desktop flutter config --[no-]enable-linux-desktop |
可以使用flutter doctor查看情况
如果报错：
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$ flutter doctor Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source! Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [版本 10.0.22000.708], locale zh-CN) [√] Android toolchain - develop for Android devices (Android SDK version 32.0.0) [√] Chrome - develop for the web [☠] Visual Studio - develop for Windows (the doctor check crashed) X Due to an error, the doctor check did not complete. If the error message below is not helpful, please let us know about this issue at https://github.com/flutter/flutter/issues. X Exception: Bad UTF-8 encoding (U+FFFD; REPLACEMENT CHARACTER) found while decoding string: [ { "instanceId": "5cb9d9e1", "installDate": "2022-06-12T07:42:21Z", "installationName": "VisualStudio/17.2.3+32526.322", "installationPath": "D:\\Program Files\\Microsoft Visual Studio\\2022\\Community", "installationVersion": "17.2.32526.322", "productId": "Microsoft.VisualStudio.Product.Community", "productPath": "D:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\devenv.exe", "state": 4294967295, "isComplete": true, "isLaunchable": true, "isPrerelease": false, "isRebootRequired": false, "displayName": "Visual Studio Community 2022", "description": "����ǿ��� IDE����ѧ��������Դ��������ߺ������ʹ��", "channelId": "VisualStudio.17.Release", "channelUri": "https://aka.ms/vs/17/release/channel", "enginePath": "C:\\Program Files (x86)\\Microsoft Visual Studio\\Installer\\resources\\app\\ServiceHub\\Services\\Microsoft.VisualStudio.Setup.Service", "installedChannelUri": "https://aka.ms/vs/17/release/channel", "releaseNotes": "https://docs.microsoft.com/en-us/visualstudio/releases/2022/release-notes-v17.2#17.2.3", "thirdPartyNotices": "https://go.microsoft.com/fwlink/?LinkId=661288", "updateDate": "2022-06-12T07:42:21.8130931Z", "catalog": { "buildBranch": "d17.2", "buildVersion": "17.2.32526.322", "id": "VisualStudio/17.2.3+32526.322", "localBuild": "build-lab", "manifestName": "VisualStudio", "manifestType": "installer", "productDisplayVersion": "17.2.3", "productLine": "Dev17", "productLineVersion": "2022", "productMilestone": "RTW", "productMilestoneIsPreRelease": "False", "productName": "Visual Studio", "productPatchVersion": "3", "productPreReleaseMilestoneSuffix": "1.0", "productSemanticVersion": "17.2.3+32526.322", "requiredEngineVersion": "3.2.2148.26540" }, "properties": { "campaignId": "2030:fe40db45-8e98-49e0-82b4-afb6aade85b4", "channelManifestId": "VisualStudio.17.Release/17.2.3+32526.322", "nickname": "", "setupEngineFilePath": "C:\\Program Files (x86)\\Microsoft Visual Studio\\Installer\\setup.exe" } } ] . The Flutter team would greatly appreciate if you could file a bug explaining exactly what you were doing when this happened: https://github.com/flutter/flutter/issues/new/choose The source bytes were: [91, 13, 10, 32, 32, 123, 13, 10, 32, 32, 32, 32, 34, 105, 110, 115, 116, 97, 110, 99, 101, 73, 100, 34, 58, 32, 34, 53, 99, 98, 57, 100, 57, 101, 49, 34, 44, 13, 10, 32, 32, 32, 32, 34, 105, 110, 115, 116, 97, 108, 108, 68, 97, 116, 101, 34, 58, 32, 34, 50, 48, 50, 50, 45, 48, 54, 45, 49, 50, 84, 48, 55, 58, 52, 50, 58, 50, 49, 90, 34, 44, 13, 10, 32, 32, 32, 32, 34, 105, 110, 115, 116, 97, 108, 108, 97, 116, 105, 111, 110, 78, 97, 109, 101, 34, 58, 32, 34, 86, 105, 115, 117, 97, 108, 83, 116, 117, 100, 105, 111, 47, 49, 55, 46, 50, 46, 51, 43, 51, 50, 53, 50, 54, 46, 51, 50, 50, 34, 44, 13, 10, 32, 32, 32, 32, 34, 105, 110, 115, 116, 97, 108, 108, 97, 116, 105, 111, 110, 80, 97, 116, 104, 34, 58, 32, 34, 68, 58, 92, 92, 80, 114, 111, 103, 114, 97, 109, 32, 70, 105, 108, 101, 115, 92, 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Doctor found issues in 1 category. |
则需要更新Flutter SDK到3.0.2以上的版本即可，如下：
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$ flutter upgrade |
2. 在旧项目中添加Windows平台支持
在项目地址输入如下指令
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flutter create --platforms=windows[,macos,linux] . |
注意: 项目的名称必须是全小写，如果出现大小写则会报错
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"TxxxFxxx" is not a valid Dart package name. See https://dart.dev/tools/pub/pubspec#name for more information. |
3. 构建Windows项目exe
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flutter build windows |