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How to remove not null constraint in sql server using query

... or you can do : alter table table_name modify column_name type(30) NULL. 30 being the size of your column type, example: varchar(30) – nr5 Sep 19 '12 at 18:11 ...
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Obscure a UITextField password

...uct your string by yourself. Take a look at this delegate method textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) – Fangming Aug 1 '19 at 14:04 ...
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Python initializing a list of lists [duplicate]

... Use _ instead i for passing "'i' value is not used" inspection. – Renat Zaripov Feb 21 '17 at 12:55 ...
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ON_COMMAND_RANGE 用法 - C/C++ - 清泛网 - 专注C/C++及内核技术

ON_COMMAND_RANGE 用法申明消息宏 + 回调函数模型,其他没什么好解释的。BEGIN_MESSAGE_MAP(CxxDialog, CDialog) ON_COMMAND_RANGE(IDC_BUTTON_1, IDC_BUTTON_ALL, OnButtonClick) END_MESSAGE_MAP() afx_msg void OnButtonClick(UINT nID);ON_COMMAND_RANGE, MFC
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ATL COM开发入门(一)(JS调用ActiveX/COM组件) - C/C++ - 清泛网 - 专注C/C++及内核技术

...R* pStr1, BSTR* pStr2, BSTR* pRetStr) { CString retStr; retStr.Format(_T("%s%s"), *pStr1, *pStr2); *pRetStr = retStr.AllocSysString(); return S_OK; } 四、写一个简单的html网页进行测试: <HTML> <HEAD> <TITLE>COM接口测试页</TITLE> <script type="text/javascript">...
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ATL COM开发入门(二)(ActiveX/COM组件回调JS) - C/C++ - 清泛网 - 专注C/C++及内核技术

...patch; UINT nRet = SetTimer(NULL, // handle to main window ID_TIMER, // 定时器标识 1000, // 1 秒间隔 (TIMERPROC)TimerProc); // 回调函数 return S_OK; } TimerProc回调函数: IDispatch* gIDispatch = NULL; #define ID_TIMER 1 ...
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LVN_ITEMCHANGED通知会响应多次的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

LVN_ITEMCHANGED通知会响应多次的问题CListCtrl LVN_ITEMCHANGED通知会响应多次(三次)的问题及替代方案。 #define LVIF_STATE 0x0008 #define LVIS_FOCUSED 0x0001 #define LVIS_SELECTED 0x0002 // 在CListCtrl派生类中响应LVN_ITEMCHANG...
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WSAAsyncSelect模型 - C/C++ - 清泛网 - 专注C/C++及内核技术

...个窗口句柄, 套接字的通知消息将被发到此窗口中 u_int wMsg, //网络事件到来的ID,可以在WM_USER以上数值中任意指定一个值 long IEvent //指定哪些通知码需要发送 //FD_READ可以读套接字 ...
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C++/COM VARIANT实现二维数组 - C/C++ - 清泛网 - 专注C/C++及内核技术

... 使用SAFEARRAR实现二维数组的源代码如下: VARTYPE vt = VT_I4; /*数组元素的类型,long*/   SAFEARRAYBOUND sab[2]; /*用于定义数组的维数和下标的起始值*/   sab[0].cElements = 2;   sab[0].lLbound = 0;   sab[1].cElements = 2;   sab[1].lLbou...
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SHFileOperation 这个API函数怎么用起来结果飘忽不定? - C/C++ - 清泛网 -...

...dNextFile,支持 * 通配符查找文件,核心代码如下: WIN32_FIND_DATA FindFileData; char szCurPath[MAX_PATH + 1] = { 0 }; GetCurrentDirectory(MAX_PATH, szCurPath); CString findFileName; findFileName.Format("%stest*.txt", szCurPath); HANDLE hFind = ::FindFirstFile(findFileName,...