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[工程源码实例] C++ ADO 读写Excel源码及注意点 - C/C++ - 清泛网 - 专注C/C++及内核技术
...动，有解决的烦请评论告知下)
"Provider='Microsoft.JET.OLEDB.4.0';Data Source=" << filename << ";Extended Properties=\"Excel 8.0;HDR=" << hdr << "\"";
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//建立连接(通用的ADO方法，读写数据库也是这种写法)
_bstr_t connStr(makeConnStr(excelFile, header).c_str())...
C++使用多核编译，加快编译速度 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ux make编译时只需要加 -j 指定编译使用CPU核心数：
make -j 4 //使用4个核编译
make -j //不指定数量，则自动探测CPU核心数量，全部参与编译
Eclipse（实际也是指定make -j）
项目属性 -> c/c++ Build -> Behavior -> Enable parallel build
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git pull while not in a git directory
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458
Starting git 1.8.5 (Q4 2013), you will be able to "use a Git command, but without having to ch...
Why are C character literals ints instead of chars?
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answered Apr 23 '14 at 16:04
John VincentJohn Vincent
57155 silver badges44 bronze badges
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Append value to empty vector in R?
...appending for larger vectors.
set.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time(...
Why are these constructs using pre and post-increment undefined behavior?
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14 Answers
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Active
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Android Studio Checkout Github Error “CreateProcess=2” (Windows)
...something like :
C:\Users\Your_Username\AppData\Local\GitHub\PortableGit_ca477551eeb4aea0e4ae9fcd3358bd96720bb5c8\bin
Alternatively , if you don't want to add to environment variables. You can open the android studio and go to :
Settings -> Version Control -> Git
In text box next to "Path to...
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
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114
Counterintuitively, the fastest version, on Hotspot 8, is:
MyClass[] arr = myList.toArray(new M...
Renaming columns in pandas
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1974
Just assign it to the .columns attribute:
>>> df = pd.DataFrame({'$a':[1,2], '$b': [10,...
Git Diff with Beyond Compare
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141
I don't use extra wrapper .sh files. My environment is Windows XP, git 1.7.1 on cygwin, and Bey...