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    <p>You do not need to find the length of the string after the call to <code>wsprintf</code> as it returns the number of characters copied to the buffer.</p> <p>Next, there is what is called <a href="http://en.wikipedia.org/wiki/Application_binary_interface" rel="nofollow">Application binary interface (ABI)</a> which covers many details such as <a href="http://en.wikipedia.org/wiki/X86_calling_conventions" rel="nofollow">Calling Conventions</a></p> <p>When you are dealing with the Windows API, or C runtimes, they follow these calling conventions, where <code>esi</code>, <code>edi</code>, <code>ebx</code>, <code>ebp</code>, and <code>esp</code> are saved across the function call. Which means, if you have a value in one of those registers, then call an API function, that value will still be the same after the call.</p> <p><code>eax</code>, <code>ecx</code>, and <code>edx</code> do not have to be saved, so anything you have in those registers before a call is NOT guaranteed to be the same. if you have something in those registers, and you need that value after a call, you need to save to a variable or the stack with <code>push</code></p> <p><code>eax</code> is used for return values.</p> <p>That being said, in this sample, I use <code>ebx</code> as the loop counter, and <code>esi</code> as the current number to print, as those values will stay the same across API calls.</p> <p>This is NASM, but it will give you and idea.</p> <pre><code>%include "externs.inc" %define STD_OUTPUT_HANDLE -11 %define STD_INPUT_HANDLE - 10 %define NULL 0 SECTION .data strFormat DB "Number %d ",13,10,0 SECTION .bss buf resb 16 stdout resd 1 stdin resd 1 lpNumRead resd 1 inChar resb 1 global start2 SECTION .text start2: push STD_OUTPUT_HANDLE call GetStdHandle mov [stdout], eax push STD_INPUT_HANDLE call GetStdHandle mov [stdin], eax mov ebx, 10000 mov esi, 1 CountOut: push esi push strFormat push buf call wsprintf add esp, 4 * 3 push NULL push lpNumRead push eax push buf push dword [stdout] call WriteConsole inc esi dec ebx jnz CountOut push NULL push lpNumRead push 1 push inChar push dword [stdin] call ReadConsole push 0 call ExitProcess </code></pre>
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