dotnet core barcode generator

.net core barcode generator

dotnet core barcode generator

dotnet core barcode generator

.net core barcode generator,
.net core barcode,
.net core barcode,
dotnet core barcode generator,
.net core barcode generator,
dotnet core barcode generator,
.net core barcode,
.net core barcode,
dotnet core barcode generator,
.net core barcode,
.net core barcode generator,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode generator,
.net core barcode,
dotnet core barcode generator,
.net core barcode,
dotnet core barcode generator,
dotnet core barcode generator,

.net core barcode generator,
.net core barcode generator,
.net core barcode generator,
.net core barcode generator,
.net core barcode,
.net core barcode generator,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode,
.net core barcode,
.net core barcode,
.net core barcode generator,
.net core barcode,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode generator,
dotnet core barcode generator,
.net core barcode generator,
.net core barcode,
dotnet core barcode generator,
.net core barcode generator,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode,
.net core barcode generator,
.net core barcode,
.net core barcode generator,
dotnet core barcode generator,
.net core barcode,
.net core barcode generator,
.net core barcode generator,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode generator,
.net core barcode generator,
.net core barcode,
.net core barcode generator,
dotnet core barcode generator,
.net core barcode generator,
.net core barcode,
.net core barcode generator,
.net core barcode,
.net core barcode,
.net core barcode,
dotnet core barcode generator,
dotnet core barcode generator,
.net core barcode,
dotnet core barcode generator,
dotnet core barcode generator,
dotnet core barcode generator,

Listing 4-12. /sql/sql_parse.cc do_command() bool do_command(THD *thd) { char *packet; ulong packet_length; NET *net; enum enum_server_command command; packet=0; net_new_transaction(net); packet_length=my_net_read(net); packet=(char*) net->read_pos; command = (enum enum_server_command) (uchar) packet[0]; DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length)); } Now we re really getting somewhere, eh We ve highlighted a bunch of items in do_command() to remind you of topics we covered earlier in the chapter. First, remember that packets are sent using the network subsystem s communication protocol. net_new_transaction() starts off the communication by initiating that first packet from the server to the client (see Figure 4-3 for a refresher). The client uses the passed net struct and fills the net s buffers with the packet sent back to the server. The call to my_net_read() returns the length of the client s packet and fills the net->read_pos buffer with the packet string, which is assigned to the packet variable. Voil , the network subsystem in all its glory! Second, we ve highlighted the command variable. This variable is passed to the dispatch_ command() routine along with the THD pointer, the packet variable (containing our SQL statement), and the length of the statement. We ve left the DBUG_RETURN() call in there to remind you that do_command() returns 0 when the command requests succeed to the caller, handle_ one_connection(), which, as you ll recall, uses this return value to break out of the connection wait loop in case the request failed. Let s now take a look at dispatch_command(), in Listing 4-13. Listing 4-13. /sql/sql_parse.cc dispatch_command() bool dispatch_command(enum enum_server_command command, THD *thd, char* packet, uint packet_length) { switch (command) { // ... omitted case COM_TABLE_DUMP: case COM_CHANGE_USER: // ... omitted case COM_QUERY: { if (alloc_query(thd, packet, packet_length)) break; // fatal error is set mysql_log.write(thd,command,"%s",thd->query); mysql_parse(thd,thd->query, thd->query_length);

Text = "Accelerometer data: " + AccelerometerDataXToString("0000") + ", " + AccelerometerDataYToString("0000") + ", " + AccelerometerDataZToString("0000"); } Both of these mechanisms are present in the Accelerometer example project, though the keyboard mechanism is commented out Try swapping between them to see how each one feels..

N L L * *

} // .. omitted } Just as the name of the function implies, all we re doing here is dispatching the query to the appropriate handler In the switch statement, we get case d into the COM_QUERY block, since we re executing a standard SQL query over the connection The alloc_query() call simply pulls the packet string into the THD->query member variable and allocates some memory for use by the thread Next, we use the mysql_log global MYSQL_LOG object to record our query, as is, in the log file using the log s write() member method This is the General Query Log (see 6) simply recording the query which we've requested Finally, we come to the call to mysql_parse() This is sort of a misnomer, because besides parsing the query, mysql_parse() actually executes the query as well, as shown in Listing 4-14 Listing 4-14 /sql/sql_parse.

Game in Focus: Cosmic Rocks (Part II)

N L L L * *

cc mysql_parse() void mysql_parse(THD *thd, char *inBuf, uint length) { if (query_cache_send_result_to_client(thd, inBuf, length) <= 0) { LEX *lex= thd->lex; yyparse((void *)thd); mysql_execute_command(thd); query_cache_end_of_result(thd); } DBUG_VOID_RETURN; } Here, the server first checks to see if the query cache contains an identical query request that it may use the results from instead of actually executing the command If there is no hit on the query cache, then the THD is passed to yyparse() (the Bison-generated parser for MySQL) for parsing This function fills the THD->Lex struct with the optimized road map we discussed earlier in the section about the query parsing subsystem Once that is done, we go ahead and execute the command with mysql_execute_command(), which we ll look at in a second Notice, though, that after the query is executed, the query_cache_end_of_result() function awaits.

So now that we are comfortable with all the options for reading input from the user, let s use them to add to the Cosmic Rocks game that we started building in the last chapter. The rest of this chapter will focus on using input techniques to turn the project into an actual playable game. There are three actions that we need to be able to support: shooting in a specified direction, firing the ship thrusters to move the spaceship forward, and hitting the hyperspace button to randomly transport the player to another location on the screen.