The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 3: Accessing FILESTREAM Data from Client ApplicationsListing 3-11 opens a disk file and copies the contents of the file into a FILESTREAMcolumn.//Get a handle to the FILESTREAM data using OpenSqlFileStream APIfsHandle = OpenSqlFilestream(dstFilePath, SQL_FILESTREAM_WRITE, 0, tkn, tknSize, 0);//Open the disk file to readfileHandle = CreateFile(TEXT("C:\\temp\\microsoftmouse2.jpg"), GENERIC_READ,FILE_SHARE_READ, NULL, OPEN_EXISTING,FILE_FLAG_SEQUENTIAL_SCAN, NULL);const int COPYBUFFERSIZE = 4096;DWORD bytesRead = 0;DWORD bytesWritten = 0;do{//Read from the disk fileReadFile(fileHandle, buffer, COPYBUFFERSIZE, &bytesRead, NULL);//Write to the FILESTREAM columnif (bytesRead > 0){WriteFile(fsHandle, buffer, bytesRead, &bytesWritten, NULL);}} while (bytesRead == COPYBUFFERSIZE);//close the disk file handle before closing the transactionif ( fileHandle != INVALID_HANDLE_VALUE ) CloseHandle(fileHandle);Listing 3-11:Using C++ to read from a disk file and write into a FILESTREAM column.100