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Better way to cast object to int
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You have several options:
(int) — Cast operator. Works if the object already is an integer at some level in the inheritance hierarchy or if there is an implicit conversion defined.
int.Parse()/int.TryParse() — For converting from a string of unknown format.
int.ParseExact()/int...
How to work around the lack of transactions in MongoDB?
I know there are similar questions here but they are either telling me to switch back to regular RDBMS systems if I need transactions or use atomic operations or two-phase commit . The second solution seems the best choice. The third I don't wish to follow because it seems that many things coul...
Get Android API level of phone currently running my application [duplicate]
...s various pieces of information about the Android OS a system is running.
If you care about all versions possible (back to original Android version), as in minSdkVersion is set to anything less than 4, then you will have to use android.os.Build.VERSION.SDK, which is a String that can be converted t...
Java: Integer equals vs. ==
...s I'm going to encounter, the value would be under 127. Good to catch this now though for the 5% where it isn't.
– Jeremy Goodell
Sep 3 '10 at 17:36
1
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ERROR: Error 1005: Can't create table (errno: 121)
...ly for you, and it brought me here. I quote:
You will get this message if you're trying to add a constraint with a
name that's already used somewhere else
To check constraints use the following SQL query:
SELECT
constraint_name,
table_name
FROM
information_schema.table_constrain...
Colon (:) in Python list index [duplicate]
...[len(a):] - This gets you the length of a to the end. It selects a range. If you reverse a[:len(a)] it will get you the beginning to whatever is len(a).
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Python - Count elements in list [duplicate]
...tal number of objects in a nested list (including multidimensional lists). If you have numpy, use size(). Otherwise use list comprehensions within recursion.
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ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
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void Func(IUnknown * punk)
{
CComQIPtr<IXXX> pno(punk);
if(pno)
{
//正确转换
pno->doSomething();
}
}
(2) 赋值
赋值的时候，发生下面三件事：
如果当前指针不为空，那么释放当前指针
如果源指针不为空，那...
Visul C++中CList用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...g str1="hello";
CString str2="world";
CString str3="my";
CString str4="life";
list.AddTail(str1);
list.AddTail(str2);
list.AddTail(str3);
list.AddTail(str4);
POSITION pos = list.GetHeadPosition();
while(pos!=NULL)
{
CString data = list.GetNext(pos);
//do something
}
这样就...
Win32 创建控件风格不是Win XP的解决方案 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，下面说一下解决方案吧：
这个根本办法就是加一个manifest文件，其内容如下：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity
name="XP style manifest"
...