hresult 0x80070002

file to the project name Ctrl.h file#include Find Declare_dyncreate (project name ctrl)After that, add the following codeDeclare_interface_map () Begin_interface_part (Objsafe, IObjectSafety) Stdmethod_ (HRESULT, getinterfacesafetyoptions) ( refiid riid, *pdwsupportedoptions, * pdwenabledoptions ); Stdmethod_ (HRESULT, SetInterfaceSafetyOptions) (

query, so what is this interface? This is the famous IUnknown interface, and the IUnknown interface is defined in the Windows SDK Unknwn.h, which is defined as follows: Copy Code code as follows: Interface IUnknown { Public Virtual HRESULT stdmethodcalltype QueryInterface (REFIID riid, _com_outptr_ void **ppvobject) = 0; Virtual ULONG stdmethodcalltype AddRef (void) = 0; Virtual ULONG Stdmethodcalltype release (void) = 0;

operation rather than a COM operation, in the lookup SQL This is especially true when the server online brochure (BOL) is in use. Let's talk about how to use SQL Server's COM automated operation stored procedures and how COM automated operations can help us solve real-world programming problems. Details of COM operations Table 1 lists the 7 extended stored procedures for COM operations in SQL Server. When automating a COM object, you need to first establish an instance of a COM object by callin

Three, purely manually create a COM component 1, from the construction project to the implementation of registration In this process we will complete three steps: Create DLL entry function, define interface file, implement registration function 1.1 Create a type Win32 DLL project Create a Win32 DLL project called Mathcom. In the second step of the wizard, select the "A smiple DLL project" option. Of course, if you choose an empty project, then you complete the DllMain definition yourself.

These are in the MFC framework for the study of insurance projects, only studied for two weeks, but still learned a lot of knowledge. Here is a look at the various operations of the database using ADO. 1, the database connection and open the project is SQL Server database, ADO connection data encountered the most important problem is to find the connection string, through a variety of personal experience, found on the internet a bug-free method, is by creating a new Ado.udl file and then open

detail. 1. Initialization1) Create an idirectsound8 interface object You can use the directsoundcreate8 () method to create a device object. This object usually represents the default playing device. The directsoundcreate8 () function is defined as follows. HRESULT DirectSoundCreate8( LPCGUID lpcGuidDevice, LPDIRECTSOUND8 * ppDS8, LPUNKNOWN pUnkOuter) The parameters are described as follows: Lpcguiddevice: guid of the device object to be created.

the index of the pointer of the function in vtbl so that it can call them? When a macro language calls a function in the COM component, three types of information can be used: the proid, function name, and parameters passed to the function. The macro runtime system must provide a simple method to execute functions with the old name of the function. This method is the idispatch interface. 1.2idispatch Interface In short, idispatch will receive a function name and execute it. IDL description of

Compile a transform filter to flip the image. In msdn, the "Writing transform filters" section lists the six basic steps for writing a transform filter. Follow these six steps one by one. 1. Select base class Derived from cbasefilter, three classes are used to compile the transform filter: ctransformfilter, ctransinplacefilter, and cvideotransformfilter. For the differences between the three base classes, see the description of msdn. We select the ctransformfilter class. After selecting the bas

, the constructor simply calls AddRef of the pointer. However, if the type is different, it first calls the QueryInterface of the pointer to obtain the same type of interface pointer. When the QueryInterface fails, the internal pointer is set to NULL. All the following code can be used to check whether the conversion is successful: Void func (iunknown * punk) (2) Assignment When assigning values, the following three events occur: 111. If the current pointer is not null, release the current po

the source ); The DoDragDrop parameter contains information about the drag and drop source object and the drag data. In the DoDragDrop function, the information about the drag target object is obtained through the cursor position. Next, the author provides a method to drag and drop files without using the mouse, but by simulating code.To use the code to simulate the drag and drop operation, you need to extract the GUI operation part of the DoDragDrop function to find the function that actually

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, shlobj, classes; TypeTcontextmenu = Class (tcomobject, ishellextinit, icontextmenu)PrivateFfilename: array [0 .. max_path] of char;ProtectedFunction ishellextinit. initialize = seiinitialize; // avoid compiler warningFunction seiinitialize (pidlfolder: pitemidlist; lpdobj: idataobject;Hkeyprogid: hkey): hresult; stdcall;Function querycontextmenu (menu: hmenu; indexmenu, id1_first, idcmdlast,Uflags: uint): hresul