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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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由于错误或中断，无法建立连接。可以通过属性 LastErrorCode 和 LastErrorMessage 查看错误原因。
Connect
常量属性：
为了简化状态查询，已经实现了 IsConnected 和 IsDisconnected 属性：
下面的状态图解释了连接建立和...
How to check version of python modules?
...nt call last):
File "<string>", line 1, in <module>
AttributeError: 'module' object has no attribute '__version__'
Lastly, as the commands in your question are prefixed with sudo, it appears you're installing to the global python environment. Strongly advise to take look into python ...
How to add multiple columns to a table in Postgres?
... Ouch... Neither of the syntaxes above work in Redshift :-( I get errors: ERROR: syntax error at or near "," LINE 1: ALTER TABLE x ADD COLUMN col1 int, ADD COLUMN colX int
– Doug P
Nov 18 '19 at 23:01
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How to pass json POST data to Web API method as an object?
...s: function (data, status, xhr) {
alert('Success!');
},
error: function (xhr, status, error) {
alert('Update Error occurred - ' + error);
}
});
share
|
improv...
Remove insignificant trailing zeros from a number?
...oesn't work when you have variable with some floating point representation error, like: var n = 1.245000000000001 (assuming it is insignificant to be represented to user)
– augur
Jun 8 '17 at 15:04
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What is the length of the access_token in Facebook OAuth2?
... Yes, I got 284 characters in production app so I got database error due to the column is varchar(255)...
– Yuki Matsukura
Mar 26 '15 at 2:15
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The provider is not compatible with the version of Oracle client
...get a " The provider is not compatible with the version of Oracle client " error message. Any help would be appreciated.
2...
How to allocate aligned memory only using the standard library?
...n successful completion, posix_memalign() shall return zero; otherwise, an error number shall be returned to indicate the error.
Either or both of these could be used to answer the question now, but only the POSIX function was an option when the question was originally answered.
Behind the scenes...
Posting a File and Associated Data to a RESTful WebService preferably as JSON
...on" forHTTPHeaderField:@"Photo-Description"];
NSURLResponse *response;
NSError *error;
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
At the server side, I receive the photo using the code:
InputStream is = request.inputStream
def receivedPh...
partial string formatting
...ring.Template('${x} ${y}')
try:
template.substitute({'x':1}) # raises KeyError
except KeyError:
pass
# but the following raises no error
partial_str = template.safe_substitute({'x':1}) # no error
# partial_str now contains a string with partial substitution
partial_template = string.Template(p...