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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
In Rails we can do the following in case a value doesn't exist to avoid an error:
12 Answers
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'uint32_t' identifier not found error
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I copy and paste your code on my page. But it shows this error "syntax error : missing ';' before identifier 'int32_t'" and "missing type specifier - int assumed. Note: C++ does not support default-int".
– kevin
Mar 2 '11 at 2:40
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How to set the thumbnail image on HTML5 video?
...eg_match('/data:([^;]*);base64,(.*)/', $_POST['data'], $matches)) {
die("error");
}
$data = $matches[2];
$data = str_replace(' ', '+', $data);
$data = base64_decode($data);
$file = 'text.jpg';
$dataname = file_put_contents($thumbs_dir . $file, $data);
}
?>
//jscode
<script type="text/j...
Error starting jboss server
... as always install and test standard tools which I use, and now I get this error like never before when I tried to start Jboss 5 from eclipse, its quite big exeption :
...
Xcode gave strange newsstand-error when trying to submit an app
... the the Appstore. But when I click submit in Xcode 4.1 I get this strange error message:
3 Answers
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How can I check ModelState.IsValid from inside my Razor view [duplicate]
...ourse:
@if (!ViewData.ModelState.IsValid)
{
<div>There are some errors</div>
}
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libcurl网络连接使用tcp/ip - C/C++ - 清泛网 - 专注C/C++及内核技术
... = curl_easy_perform(curl);
if(CURLE_OK != res)
{
printf("Error: %s\n", strerror(res));
return 1;
}
/* Extract the socket from the curl handle - we'll need it for waiting.
* Note that this API takes a pointer to a 'long' while we use
* curl_socket_t for ...
error C2275: “size_t”: 将此类型用作表达式非法 - C/C++ - 清泛网 - 专注C/C++及内核技术
error C2275: “size_t”: 将此类型用作表达式非法这个错误是由于C的编译器要求将变量的申明放在一个函数块的头部，而c++没有这样的要求造成的。解决的办法就是把变量的声明全部放在变量的生...这个错误是由于C的编译器要求将...
error LNK2019: 无法解析的外部符号 _GetFileVersionInfoSizeW@8，该符号在...
error LNK2019: 无法解析的外部符号 _GetFileVersionInfoSizeW@8，该符号在函数 _wmain 中被引用GetFileVersionInfoSize build时出现link2019 链接错误：#pragma comment(lib, "version")解决。GetFileVersionInfoSize build时出现link2019 链接错误：
#pragma comment(lib, "v...
解决：Successful WSAStartup not yet performed. Error code : 10093. - C...
解决：Successful WSAStartup not yet performed. Error code : 10093.出现10093错误的原因是应用程序没有调用 WSAStartup，或者 WSAStartup 失败。原因：调用WSASocket等Socket函数之前必须先执行WSAStartup...出现10093错误的原因是应用程序没有调用 WSAStartup...