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App Inventor 2 如何下载/保存网络图片？ - App Inventor 2 中文网 - 清泛I...
首先，需要使用 Web客户端 组件，需要和网络url进行数据交互的场景就要考虑使用它，Web客户端 组件在“通信连接”抽屉中：设置好网络图片的url，然后执行Get方法即可，代码如下：其中，特别要注意的是保存响应信息属性设置...
App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...阅设备的数量，以及消息的发送历史：
.aia 源码下载
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MQTT拓展下载...
Windows batch files: .bat vs .cmd?
...extensions enabled, PATH/APPEND/PROMPT/SET/ASSOC in .CMD
files will set ERRORLEVEL regardless of error. .BAT sets ERRORLEVEL
only on errors.
In other words, if ERRORLEVEL is set to non-0 and then you run one of those commands, the resulting ERRORLEVEL will be:
left alone at its non-0 value...
Where is the C auto keyword used?
...(auto versus extrn). If you do not use one or the other, you have a syntax error. That is to say, x, y; is not a declaration by itself, but auto x, y; is.
Since code bases written in B had to be ported to NB and to C as the language was developed, the newer versions of the language carried some bag...
Combining multiple git repositories
...
Same error when I do that. Got my hopes up. Also, the link is now broken.
– Ryan
Jul 22 '14 at 18:41
...
Is delete this allowed?
...ject remains valid until after the throw takes place.
void myclass::throw_error()
{
std::unique_ptr<myclass> bye_bye(this);
throw std::runtime_exception(this->error_msg);
}
Note: if you're using a compiler older than C++11 you can use std::auto_ptr instead of std::unique_ptr, it ...
jsoncpp 不能处理__int64(long long)类型数据 - C/C++ - 清泛网 - 专注C/C++及内核技术
...note: Json::Value::Value(Json::ValueType) <near match>
当我的要生成json的数据中包含long类型时，出现了这个错误！如果将long改为int或double则可以通过编译。
根据错误信息，很显然，jsoncpp并没有实现插入数据中有long long类型的...
How do you check “if not null” with Eloquent?
...
422
Eloquent has a method for that (Laravel 4.*/5.*);
Model::whereNotNull('sent_at')
Laravel 3:...
BitBucket - download source as ZIP
...
422
For the latest version of Bitbucket (2016+), the download link can be found in the Download me...
What does “use strict” do in JavaScript, and what is the reasoning behind it?
...my JavaScript code through Crockford's JSLint , and it gave the following error:
28 Answers
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