小编Cha*_*997的帖子

我在将本地数据库导入 Heroku 时遇到问题。我目前正在构建一个 Django Web 应用程序，我试图了解如何将本地数据库导入 Heroku。我试图用 pg:push 命令推送我的本地 Postgresql 数据库，然后这个错误发生

pg_restore: error: unrecognized data block type (0) while searching archive
 !    pg_restore errored with 1

知道为什么会这样吗？

我试图在 Flutter 项目中运行我的 .dart 文件，以了解 SQlite 数据库如何在 Flutter 应用程序中工作。所以我正在执行我的 .dart 文件然后出现此错误

C:\\Users\\ChangNoi\\Desktop\\GitHub\\project_fight_2\\lib\\backend>dart database.dart\ndatabase.dart: Warning: Interpreting this as package URI,'package:projectfight2/backend/database.dart'.\n\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/binary_messenger.dart:7:8: Error: Notfound: 'dart:ui'\nimport 'dart:ui' as ui;\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/binding.dart:7:8: Error: Not found: 'dart:ui'\nimport 'dart:ui' as ui;\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/font_loader.dart:7:8: Error: Not found: 'dart:ui'\nimport 'dart:ui';\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/platform_messages.dart:7:8: Error: Not found: 'dart:ui'\nimport 'dart:ui' as ui;\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/platform_views.dart:7:8: Error: Not found: 'dart:ui'\nimport 'dart:ui';\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/raw_keyboard.dart:7:8: Error: Not found: 'dart:ui'\nimport 'dart:ui';\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/system_channels.dart:5:8: Error: Not found: 'dart:ui'\nimport 'dart:ui';\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/system_chrome.dart:6:8: Error: Not found: 'dart:ui'\nimport 'dart:ui';\n   ^\n/C:/Program%20Files/Flutter/packages/flutter/lib/src/services/system_chrome.dart:12:1: Error: Not found: 'dart:ui'\nexport 'dart:ui' show Brightness;\n …

我正在学习如何在c ++编程中分配和释放memroy.我尝试增加指针,然后使用delete.它崩溃了!为什么会这样？

int *pint = new int ;
double *pDouble = new double;

*pint = 3;
*pDouble = 3.5; 

pint++;
pDouble++;

delete pint;
delete pDouble;