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Understanding the difference between __getattr__ and __getattribute__

...oesn't explicitly manage and do that via __getattr__ method. Python will call this method whenever you request an attribute that hasn't already been defined, so you can define what to do with it. A classic use case: class A(dict): def __getattr__(self, name): return self[name] a = A()...
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Interpret XMP-Metadata in ALAssetRepresentation

...epresentation]; // Create a buffer to hold the data for the asset's image uint8_t *buffer = (Byte*)malloc(representation.size); // Copy the data from the asset into the buffer NSUInteger length = [representation getBytes:buffer fromOffset: 0.0 length:representation.size error:nil]; if (length==0)...
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获取控件的值的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术

...t nIDC, int& value ); void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, UINT& value ); void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, long& value ); void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, DWORD& value ); void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, CString& value ); v...
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CDC:DrawText 多行显示文本(文本自动换行) - C/C++ - 清泛网 - 专注C/C++及内核技术

... // text length LPRECT lpRect, // formatting dimensions UINT uFormat // text-drawing options ); 参数: hdc:设备环境句柄。 lpString:指向将被写入的字符串的指针,如果参数nCount是C1,则字符串必须是以\0结束的。 ...
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ON_COMMAND_EX、ON_COMMAND区别 - C/C++ - 清泛网 - 专注C/C++及内核技术

...应的普通映射宏相比,有两个不同之处: 一是多了一个UINT类型的参数,另外就是有返回值(返回BOOL类型)。 回顾4.4.2章节,范围映射宏ON_COMMAND_RANGE的消息处理函数也有一个这样的参数,该参数在两处的含义是一样的, 即: ...
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MFC 菜单背景色设置(菜单重绘) - C/C++ - 清泛网 - 专注C/C++及内核技术

...E_MAP() ... int CMainFrm::OnCreate(LPCREATESTRUCT lpCreateStruct) { UINT style=0; if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1; mMenu.AttatchMenu(LoadMenu(NULL,MAKEINTRESOURCE(IDR_MAINFRAME))); mMenu.ChangeMenuItem(&mMenu,TRUE); SetMenu(&mMenu); ... } void C...
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AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术

...序的内存空间。 BOOL AfxIsValidAddress( const void* lp, UINT nBytes, BOOL bReadWrite = TRUE ); Parameters lp Points to the memory address to be tested. 指向被测试内存。 nBytes Contains the number of bytes of memory to ...
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MFC 获取并移动其他应用程序窗口的方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

...句柄,这种方法不依赖窗口信息。 void CDlgSpy::OnMouseMove(UINT nFlags, CPoint point) { POINT pnt; ::GetCursorPos(&pnt); HWND hwndCur = ::WindowFromPoint(pnt); //... } 其次,得到窗口句柄后移动窗口的方法: //等待启动完毕 HWND hMain = NUL...
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VC 对话框背景色覆盖CEdit背景色的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

... //页面背景色 HBRUSH CDemoView::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) { HBRUSH hbr = CFormView::OnCtlColor(pDC, pWnd, nCtlColor); // TODO: 在此更改 DC 的任何特性 //不变色 if (nCtlColor == CTLCOLOR_EDIT) return hbr; // TODO: 如果默认的不是...
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VC CTreeCtrl复选框checkbox的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

... TODO: Add your control notification handler code here CPoint point; UINT uFlag; //接收有关点击测试的信息的整数 HTREEITEM hTree; BOOL bCheck; GetCursorPos(&point); //获取屏幕鼠标坐标 m_TreeCtrl.ScreenToClient(&point); //转化...