system(“PAUSE”) is certainly less than ideal. using a call to system creates a subprocess, which on windows is fairly expensive and in any case not terribly cheap on any operating system. On embedded systems the memory overhead is significant. If there is any way to do it without much pain natively then do it. In … Read more
When command.com is asked to execute a .com or .exe file, it will call the interrupt service 21h/AH=4B, the EXEC service. It is up to the calling program to: build a DOS EXEC parameter block (see http://www.delorie.com/djgpp/doc/rbinter/it/90/15.html ) (includes information on environment variables, command lines arguments, FCBs and register values on return) free up all … Read more
You can safely undefine them, contrary to claims from others. The reason is that they’re just macros’s. They only affect the preprocessor between their definition and their undefinition. In your case, that will be from early in windows.h to the last line of windows.h. If you need extra windows headers, you’d include them after windows.h … Read more
It’s possible to redirect the standard input/output of console/dos applications using the Process class. It might look something like this: var processStartInfo = new ProcessStartInfo(“someoldapp.exe”, “-p someparameters”); processStartInfo.UseShellExecute = false; processStartInfo.ErrorDialog = false; processStartInfo.RedirectStandardError = true; processStartInfo.RedirectStandardInput = true; processStartInfo.RedirectStandardOutput = true; processStartInfo.CreateNoWindow = true; Process process = new Process(); process.StartInfo = processStartInfo; bool processStarted … Read more
All of the forementioned functions are unique in what they accomplish, but at first the abundance does seem somewhat exagerated. Int 21h AH=02h Write Character To Standard Output This function interprets the character codes 7 (Beep), 8 (Backspace), 9 (Tab), 10 (Linefeed), and 13 (Carriage return). All other character codes are displayed. Backspace is nondestructive … Read more
Your input digits are ASCII characters, so ‘1’ is actually 31h, for example. So when you calculate 1+1 your are getting 31h+31h=62h which is the ASCII character ‘b’. To convert your input digits to their equivalent integer values you need to subtract ‘0’ (30h). Conversely to output integer digits as ASCII characters you will need … Read more
You basically want to divide by 10, print the remainder (one digit), and then repeat with the quotient. ; assume number is in eax mov ecx, 10 loophere: mov edx, 0 div ecx ; now eax <– eax/10 ; edx <– eax % 10 ; print edx ; this is one digit, which we have … Read more
I don’t know of anyway to step through the execution of a .bat file but you can use echo and pause to help with debugging. ECHO Will echo a message in the batch file. Such as ECHO Hello World will print Hello World on the screen when executed. However, without @ECHO OFF at the beginning … Read more