atl

Difference between unsigned char and char pointers

由 不羁的心 提交于 2019-12-10 16:07:08
问题 I'm a bit confused with differences between unsigned char (which is also BYTE in WinAPI) and char pointers. Currently I'm working with some ATL-based legacy code and I see a lot of expressions like the following: CAtlArray<BYTE> rawContent; CALL_THE_FUNCTION_WHICH_FILLS_RAW_CONTENT(rawContent); return ArrayToUnicodeString(rawContent); // or return ArrayToAnsiString(rawContent); Now, the implementations of ArrayToXXString look the following way: CStringA ArrayToAnsiString(const CAtlArray<BYTE>

Copying a bitmap from another HBITMAP

由 隐身守侯 提交于 2019-12-10 14:21:58
问题 I'm trying to write a class to wrap bitmap functionality in my program. One useful feature would be to copy a bitmap from another bitmap handle. I'm a bit stuck: void operator=( MyBitmapType & bmp ) { HDC dcMem; HDC dcSource; if( m_hBitmap != bmp.Handle() ) { if( m_hBitmap ) this->DisposeOf(); // copy the bitmap header from the source bitmap GetObject( bmp.Handle(), sizeof(BITMAP), (LPVOID)&m_bmpHeader ); // Create a compatible bitmap dcMem = CreateCompatibleDC( NULL ); m_hBitmap =

how to update row data fetched using ATL OLE database in C++ from simple SQL server table

由 喜你入骨 提交于 2019-12-10 12:20:04
问题 I am experimenting with OLE database programming using Microsoft ATL and C++ with Visual Studio 2005. I have created a sample Windows console program along with a simple database with a single table containing two columns, a 10 character (ANSI numeric digits) id and a signed 32 bit long count. There are two rows in the table. The database, table, and rows were created with SQL Server 2005 Server Management Studio Express. I need to know the method used with ATL to update the data in a row

Problem in hosting ActiveX on Vista (in a Visual Studio 6 C++ application)

由 可紊 提交于 2019-12-10 12:04:33
问题 I just installed Visual Studio 6 (SP5) on a Vista Enterprise machine. Had some problems but I think it’s set up alright. The problem is my VC++ 6 application fails when trying to host an ActiveX. I was able to compile it ok, though got a warning message from Vista about the rc.exe (“This program has known compatibility issues” ). When I debugged it I saw that my class that derives from CAxDialogImpl fails on its Create() method. The same application worked just fine on XP! Is there a known

qt C++ exception on basic_string destructor on double click run only

由 眉间皱痕 提交于 2019-12-10 11:41:34
问题 I have following code: CAtlString str = currentFolder->whatsThis().toStdWString().c_str(); currentFolder is qt QTreeWidgetItem*. When I run program from VS2010 it works ok. But when I start program by double click in the same folder (x64/Debug or Release), I have exceptions: Unhandled exception at 0x00007ffe2a07572a (ntdll.dll) in test.exe: 0xC0000005: Access violation reading location 0xffffffffffffffff. on dealloc in basic_string destructor: ~basic_string() // xstring { // destroy the

How to make WebBrowser control with transparent background?

由 情到浓时终转凉″ 提交于 2019-12-10 10:19:20
问题 I try to make my WebBrowser control transparent, so if the HTML loaded into it has no background, the underlying window should be visible. I`ve broke my head trying different ways. There is a transparent background in Microsoft Sidebar application. In gadget`s HTML <g:background> tag can be used, but this tag is not available in usual webBrowser control. I`ve also investigate in DirectX Transform filters, which can be applied to the HTML elements in IE, but have no success. Any help would be

“class not registered” which class?

由 拟墨画扇 提交于 2019-12-10 10:14:32
问题 Consider this code: try { ISomeObject pObj(__uuidof(SomeClass)); ISomeObject pObj2(__uuidof(SomeOtherClass)); } catch ( _com_error& e ) { // Log what failed } I.e. I have a block of code which instanciates my objects. Sometimes (a bad install) it failes because some class wasn't properly registered. (I don't have a particular problem, rather general discussion here.) Is there some way to, from the caught exception or otherwise, realize what class failed? A have pondered to make a wrapper of

SQL Server CE 3.5 update row error DB_E_ERRORSOCCURRED column error is DBSTATUS_E_SCHEMAVIOLATION

由 僤鯓⒐⒋嵵緔 提交于 2019-12-10 07:39:31
问题 I am investigating moving a small and simple SQL Server database to SQL Server CE and am currently using a small prototype to investigate basic operations with SQL Server CE with the following operations in mind: (1) programmatically create a table, (2) insert new records, (3) read existing records, and (4) update existing records. The prototype is having a problem with updating existing records when using the Accessor and the bound members of the Accessor struct. The select statement works

Detect clicking inside listview and show context menu

由 孤街浪徒 提交于 2019-12-09 18:51:18
问题 I have a listview created as a resource and loaded on a dialog window. I want to detect and show a context menu only when items within the listview have been clicked. MESSAGE_HANDLER(WM_CONTEXTMENU,OnContextMenu) LRESULT OnContextMenu(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& bHandled) { int iSelected = -1; int iFocusGroup = -1; iSelected = SendMessage((HWND)wParam, LVM_GETNEXTITEM, -1,LVNI_SELECTED); iFocusGroup = ListView_GetFocusedGroup((HWND)wParam); if( iSelected != -1 &&

关于在VS环境开发ActiveX控件不能在部分win10或者win8电脑上注册的解决方案

由 ℡╲_俬逩灬. 提交于 2019-12-09 18:14:01
问题描述： VS2008上利用ATL（动态模板库）编写的项目ActiveX控件在部分电脑上可成功注册并运行，但部分电脑上无法注册特别是Win10环境上。 目标： 在Win7、Win8、Win10等环境下成功注册ActiveX控件。 解决方案： 通过对问题的分析，可以发现部分电脑是可以注册的，为什么部分不可以？通过了解后发现能注册的电脑是安装过VS或者安装某些软件时候自动安装了VS运行环境，那么问题可能就是这个。然后针对这个问题进行了三种方案的研究，两种方案验证可行，那么总结出问题就是运行环境问题导致不能注册，下边分别说明和比较： 方案一（存在问题） 既然项目依赖运行库，那么其它插件为什么不需要运行库，因此首先针对项目进行了研究。发现项目编译生成dll文件时，采用的是动态链接运行库文件，因此修改编译属性为静态链接后重新编译运行项目，注册成功。 属性修改方法：项目属性-》配置属性修改“C/C++/Code Generation” -》运行时库，将/MD或/MDd 改为 /MT或/MTd，这样就实现了对VC运行时库的静态链接，在运行时就不再需要VC的dll了。 /MD和/MDd：动态链接库文件，/MD为release版本，/MDd为debug版本。 /MT和/MTd：静态链接库文件，/MT为release版本，/MTd为debug版本。 结论： 经过和项目负责人确认之后
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