Device. Io. Control function WindowsSends a control code directly to a specified device driver, causing the corresponding device to. Syntax. BOOL WINAPI Device. Io. Control. In        HANDLE       h. Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation. I got my end of life PL2303 HXA USB serial converter to work on Windows8 64bit by doing the following. Visit the prolific site and get the following driver. GMToolbox features almost every Game Maker DLL Extension ever released listed, catagorised and searchable live in realtime. F922A8A44E4CD931/image-size/original?v=mpbl-1&px=-1' alt='Winapi Serial Port List' title='Winapi Serial Port List' />Device. In        DWORD        dw. Io. Control. Code. Inopt    LPVOID       lp. The COM class allows you to instantiate an OLE compatible COM object and call its methods and access its properties. The returned object is an overloaded object. As an embedded developer who writes desktop software mostly for configuration of, and data download from, peripheral devices, I use serial data streams a lot. In. Buffer. In        DWORD        n. In. Buffer. Size. Winapi Serial Port List' title='Winapi Serial Port List' />Outopt   LPVOID       lp. Out. Buffer. In        DWORD        n. Out. Buffer. Size. Winapi Serial Port List' title='Winapi Serial Port List' />Outopt   LPDWORD      lp. Bytes. Returned. Inoutopt LPOVERLAPPED lp. Overlapped. Parametersh. Device inA handle to the device on which the operation is to be performed. The device is typically a volume. To retrieve a device handle, use the. Create. File function. For more information, see. Remarks. dw. Io. Control. Code inThe control code for the operation. This value identifies the specific operation to be performed and the. For a list of the control codes, see Remarks. The documentation for each control code provides usage details. In. Buffer, n. In. Buffer. Size. lp. Out. Buffer, and n. Out. Buffer. Size parameters. In. Buffer in, optionalA pointer to the input buffer that contains the data required to perform the operation. The format of this. Io. Control. Code parameter. This parameter can be NULL if dw. Io. Control. Code specifies. In. Buffer. Size inThe size of the input buffer, in bytes. Out. Buffer out, optionalA pointer to the output buffer that is to receive the data returned by the operation. The format of this. Io. Control. Code parameter. This parameter can be NULL if dw. Io. Control. Code specifies. Out. Buffer. Size inThe size of the output buffer, in bytes. Bytes. Returned out, optionalA pointer to a variable that receives the size of the data stored in the output buffer, in bytes. If the output buffer is too small to receive any data, the call fails. Get. Last. Error returns. ERRORINSUFFICIENTBUFFER, and lp. Bytes. Returned is zero. If the output buffer is too small to hold all of the data but can hold some entries, some drivers will return. In this case, the call fails. Get. Last. Error returns. ERRORMOREDATA, and lp. Bytes. Returned indicates the amount. Your application should call. Amcor Air Conditioner Manuals there. Device. Io. Control again with the same operation. If lp. Overlapped is NULL. Bytes. Returned cannot be NULL. Even when an operation. Out. Buffer is NULL. Device. Io. Control makes use of. Bytes. Returned. After such an operation, the value of. Bytes. Returned is meaningless. If lp. Overlapped is not NULL. Bytes. Returned can be NULL. If this parameter is not. NULL and the operation returns data, lp. Bytes. Returned is. To retrieve the number of bytes returned, call. Get. Overlapped. Result. If. h. Device is associated with an IO completion port, you can retrieve the number of. Get. Queued. Completion. Status. lp. Overlapped in, out, optionalA pointer to an OVERLAPPED structure. If h. Device was opened without specifying. FILEFLAGOVERLAPPED, lp. Overlapped is ignored. If h. Device was opened with the FILEFLAGOVERLAPPED flag. In this case. lp. Overlapped must point to a valid. OVERLAPPED structure that contains a handle to an. Otherwise, the function fails in unpredictable ways. For overlapped operations. Device. Io. Control returns immediately, and the event. Otherwise, the function does not return until the. Return value. If the operation completes successfully, the return value is nonzero. If the operation fails or is pending, the return value is zero. To get extended error information, call. Get. Last. Error. Remarks. To retrieve a handle to the device, you must call the. Create. File function with either the name of a device or. To specify a device name, use the following format. Device. Name. Device. Io. Control can accept a handle to a specific. For example, to open a handle to the logical drive A with. Create. File, specify. Alternatively, you can use the. Physical. Drive. 0,. Physical. Drive. 1, and so on, to open handles to the physical drives on a system. You should specify the FILESHAREREAD and. FILESHAREWRITE access flags when calling. Create. File to open a handle to a device driver. However. when you open a communications resource, such as a serial port, you must specify exclusive access. Use the other. Create. How Do I Manually Sync My Iphone. File parameters as follows when opening a device. The fdw. Create parameter must specify. OPENEXISTING. The h. Template. File parameter must be NULL. The fdw. Attrs. And. Flags parameter can specify. FILEFLAGOVERLAPPED to indicate that the returned handle can be used in overlapped. Does Uv Rays Go Through Car Windows there. IO operations. For lists of supported control codes, see the following topics Examples. For an example that uses Device. Io. Control, see. Calling Device. Io. Control. Requirements. Minimum supported client. Windows XPMinimum supported server. Windows Server 2. Header. Winbase. h include Windows. Library. Kernel. 32. DLLKernel. 32. dll. See also. Create. Event. Create. File. Device Input and Output Control IOCTLGet. Overlapped. Result. Get. Queued. Completion. Status. OVERLAPPED.