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To make VidCheck show its stuff, I've written a short program called INFOASM that reports certain facts about the installed display controller As a program, INFOASM doesn't present any assembly language mechanisms we haven't used before, except in one respect: string lengths To display a string, you have to tell DOS just how long the string is, in characters Counting characters is difficult, and if you get it wrong, you'll either display too much string or not enough The solution is simple: The assembler can do the counting Here's the notation: VidIDStr DB ' The installed video board is: ' LVidIDStr EQU $-VidIDStr The first statement is nothing more than a simple string constant definition that we've been using all along The second statement is a new kind of statement, an equate, which looks a lot like a data definition but is not A data definition sets aside and initializes an area of memory to some value An equate, by contrast, generates a value similar to a simple constant in such languages as Pascal An equate allocates no memory, but instead generates a value that is stored in the assembler's symbol table This value may then be used anywhere a literal constant of that type may be used Here, we're using an equate to generate a value giving us the length of the string defined immediately before the equate The expression $-VidIDStr resolves to the difference between two addresses: One is the address of the first byte of the string variable VidIDStr, and the other is the current location counter, the assembler's way of keeping track of the code and data it's generating (The current location counter bears no relation whatsoever to IP, the instruction pointer!) When the assembler is generating information (either code or data) inside a segment, it begins with a counter set to zero for the start of the segment As it works its way through the segment, generating code or allocating data, it increments this value by one for each byte of generated code or allocated data The expression $-VidIDStr is evaluated immediately after the string VidIDStr is allocated This means the assembler's current location counter is pointing to the first byte after VidIDStr Because the variable name VidIDStr itself resolves to the address of VidIDStr, and $ resolves to the location counter immediately after VidIDStr is allocated, the expression $-VidIDStr evaluates to the length of VidIDStr Even if you add or delete characters to the contents of VidIDStr, the length count will always come out correct, because the calculation always subtracts the address of the beginning of the string from the address just past the end of the string This mechanism is used to pass a reliable string length to DOS when using DOS call 40H in the Write macro The Write macro illustrates an advance in another way: Write 2 mov BX,1 mov CX,%2 mov DX,%1 mov AH,40H int 21H %endmacro %macro ;ShowIt,ShowLength ; Selects DOS file handle 1: Standard Output ; ShowLength: Length of string passed in CX ; Showit: Offset address of string passed in DX ; Select DOS service 40: Print String ; Call DOS.

C programs can call either the exit /_exit or a bo rt CRT library functions, which are similar to E x i t P ro c e s s and T e rm i n a t e P ro c e s s, respectively Each contains additional logic, however For example, exit invokes any routines registered with the CRT a t e x i t/ _o n e x i t functions, and a b o rt displays a dialog box indicating that the process has terminated abnormally Managed code may call E n v i ronment E x i t, which triggers a clean shutdown of all threads in the process The CLR will suspend all

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threads, and then i t will finalize any finalizable objects i n the process After this, it exits threads without running finally blocks The CLR will actually create a so-called "shutdown watchdog thread" that monitors the shutdown process to ensure it doesn' t hang As we'll see in 6, Data and Control Synchronization, there are circumstances in which managed threads may hang during shutdown due to locks If, after 2 seconds, the shutdown has not finished, the watchdog thread will take over and rudely shut down the process

This is a mechanism different from the one we used in the earliest iterations of the EAT program If you recall, when using DOS service 09H, you had to mark the end of a string passed to DOS with a dollar sign symbol This was a crude holdover from CP/M, and more modern DOS programs all use DOS service 40H This allows you to display strings containing dollar signs not a feature without value in some applications, such as financial programming Here's how you use DOS interrupt 21H service 40H: You must pass the offset address of the string in DX, the length of the string in CX, and a file handle in BX I won't explain file handles in detail in this book, but any good DOS reference will be adequate in picking up the details By passing the handle of a disk-based text file to DOS service 40H, you can write text to a disk-based text file instead of to the screen As given, Write uses standard file handle 1, which is standard output Standard output is by default directed to

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Any managed code may also call E n v i ronment F a i l F a st This is similar to calling E x it, except that it is meant for abnormal and unexpected situations where no managed code must run during the shutdown This means that finalizers are not run, and AppDomain events are not called, and also an entry is made in the Windows Event Log to indicate failure

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