《汇编语言 基于x86处理器》第十一章 MS-DOS 编程部分的代码 part 2
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? 书中第十一章的程序，主要讲了 Windows 接口，在小黑框中进行程序交互
● 在屏幕指定位置输出带自定义属性的文字
1 INCLUDE Irvine32.inc 2 3 .data 4 outHandle HANDLE ? 5 cellsWritten DWORD ? ; 输出计数（输出参数） 6 xyPos COORD <10,2> ; 输出坐标 7 buffer BYTE 41h,42h,43h,44h,45h,46h,47h,48h,49h,4Ah,4Bh,4Ch,4Dh,4Eh,4Fh,50h,51h,52h,53h,54h 8 BufSize DWORD ($ - buffer) 9 attributes WORD 1h,2h,3h,4h,5h,6h,7h,8h,9h,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh,10h,11,12h,13h,14h 10 11 .code 12 main PROC 13 INVOKE GetStdHandle, STD_OUTPUT_HANDLE 14 mov outHandle, eax 15 INVOKE WriteConsoleOutputAttribute, outHandle, ADDR attributes, BufSize, xyPos, ADDR cellsWritten ; 设置输出属性 16 INVOKE WriteConsoleOutputCharacter, outHandle, ADDR buffer, BufSize, xyPos, ADDR cellsWritten ; 输出 17 18 call ReadChar 19 ;call WaitMsg ; 与 ReadChar 等效 20 exit 21 main ENDP 22 END main
● 动态内存分配 1
1 INCLUDE Irvine32.inc 2 3 .data 4 ARRAY_SIZE = 1000 ; 要申请的数组尺寸 5 FILL_VAL EQU 0FFh ; 数组填充的值 6 7 hHeap DWORD ? 8 pArray DWORD ? ; 堆内存指针 9 str1 BYTE "Heap size is: ",0 10 11 .code 12 main PROC 13 INVOKE GetProcessHeap ; 获取堆内存的指针 14 .IF eax == NULL 15 call WriteWindowsMsg 16 jmp quit 17 .ELSE 18 mov hHeap, eax 19 .ENDIF 20 21 call allocate_array 22 jnc arrayOk ; 申请成功 CF = 0，失败 CF = 1 23 call WriteWindowsMsg 24 call Crlf 25 jmp quit 26 27 arrayOk: ; 填充和输出数组 28 call fill_array 29 call display_array 30 call Crlf 31 32 INVOKE HeapFree, hHeap, 0, pArray ; 释放申请的内存 33 34 quit: 35 call WaitMsg 36 exit 37 main ENDP 38 39 allocate_array PROC USES eax ; 申请堆内存 40 INVOKE HeapAlloc, hHeap, HEAP_ZERO_MEMORY, ARRAY_SIZE 41 42 .IF eax == NULL 43 stc ; 申请失败，置 CF = 1 44 .ELSE 45 mov pArray,eax ; 申请成功，保存内存指针，置 CF = 0 46 clc 47 .ENDIF 48 49 ret 50 allocate_array ENDP 51 52 fill_array PROC USES ecx edx esi 53 mov ecx, ARRAY_SIZE 54 mov esi, pArray 55 56 L1: 57 mov BYTE PTR [esi], FILL_VAL 58 inc esi 59 loop L1 60 61 ret 62 fill_array ENDP 63 64 display_array PROC USES eax ebx ecx esi 65 mov ecx, ARRAY_SIZE 66 mov esi, pArray 67 68 L1: 69 mov al, [esi] 70 mov ebx, TYPE BYTE 71 call WriteHexB 72 inc esi 73 loop L1 74 75 ret 76 display_array ENDP 77 78 END main
● 动态内存分配 2，申请多个内存堆，直到溢出
1 INCLUDE Irvine32.inc 2 3 .data 4 HEAP_START = 2000000 ; 2 MB 5 HEAP_MAX = 400000000 ; 400 MB 6 BLOCK_SIZE = 500000 ; .5 MB 7 8 hHeap DWORD ? 9 pData DWORD ? 10 11 str1 BYTE 0dh,0ah,"Memory allocation failed",0dh,0ah,0 12 13 .code 14 main PROC 15 INVOKE HeapCreate, 0,HEAP_START, HEAP_MAX 16 17 .IF eax == NULL ; 申请失败 18 call WriteWindowsMsg 19 call Crlf 20 jmp quit 21 .ELSE ; 申请成功 22 mov hHeap, eax 23 .ENDIF 24 25 mov ecx, 2000 26 27 L1: 28 call allocate_block ; 申请内存堆 29 .IF Carry? ; 失败 30 mov edx,OFFSET str1 31 call WriteString 32 jmp quit 33 .ELSE ; 成功， 34 mov al,‘.‘ ; 输出一个点 35 call WriteChar ; 显示进度 36 .ENDIF 37 38 ;call free_block ; 是否把刚申请的堆释放掉 39 loop L1 40 41 quit: 42 INVOKE HeapDestroy, hHeap ; 释放掉所有的堆 43 .IF eax == NULL ; 失败则显示信息 44 call WriteWindowsMsg 45 call Crlf 46 .ENDIF 47 48 exit 49 main ENDP 50 51 allocate_block PROC USES ecx 52 INVOKE HeapAlloc, hHeap, HEAP_ZERO_MEMORY, BLOCK_SIZE 53 54 .IF eax == NULL 55 stc ; 失败，置 CF = 1 56 .ELSE 57 mov pData,eax ; 成功，指针保存到 eax 58 clc ; 置 CF = 0 59 .ENDIF 60 61 ret 62 allocate_block ENDP 63 64 free_block PROC USES ecx 65 INVOKE HeapFree, hHeap, 0, pData 66 ret 67 free_block ENDP 68 69 END main
● 文件读写（有点问题，尚未完成）
1 INCLUDE Irvine32.inc 2 INCLUDE macros.inc 3 4 BUFFER_SIZE = 500 5 6 .data 7 buffer BYTE "abcdef", 0 8 filename BYTE "output.txt", 0 9 fileHandle HANDLE ? 10 stringLength DWORD ? 11 bytesWritten DWORD ? 12 13 .code 14 main PROC 15 16 mov edx, OFFSET filename 17 call CreateOutputFile 18 mov fileHandle, eax 19 cmp eax, INVALID_HANDLE_VALUE ; 错误检查 20 jne file_ok1 21 mWrite <"Failed to create output file",0dh,0ah> 22 jmp quit 23 24 file_ok1: 25 mov eax, fileHandle ; 写入文件 26 mov edx, OFFSET buffer 27 mov ecx, SIZEOF buffer 28 call WriteToFile 29 mov bytesWritten, eax ; 返回写入字符串长度 30 call CloseFile 31 32 mWrite <"Bytes written to file [output.txt]: "> ; 显示写入字符串长度 33 mov eax, bytesWritten 34 call WriteDec 35 call Crlf 36 call WaitMsg 37 38 mov eax, SIZEOF filename ; 打开文件 39 mov edx, OFFSET filename 40 call OpenInputFile 41 mov fileHandle, eax 42 43 cmp eax, INVALID_HANDLE_VALUE ; 错误检查 44 jne file_ok2 45 mWrite <"Failed to open the file",0dh,0ah> 46 jmp quit 47 48 file_ok2: 49 mov edx, OFFSET buffer ; 读取文件 50 mov ecx, BUFFER_SIZE 51 call ReadFromFile 52 jnc check_buffer_size 53 mWrite <"Failed to read the file.", 0dh, 0ah> 54 call WriteWindowsMsg 55 jmp close_file 56 57 check_buffer_size: ; 检查是否超出缓冲区大小 58 cmp eax, BUFFER_SIZE 59 jb buf_size_ok 60 mWrite <"Failed to read the file into buffer", 0dh, 0ah> 61 jmp quit 62 63 buf_size_ok: 64 mov buffer[eax],0 ; insert null terminator 65 mWrite "File size: " 66 call WriteDec ; display file size 67 call Crlf 68 69 mWrite <"Buffer:",0dh,0ah,0dh,0ah> 70 mov edx,OFFSET buffer ; display the buffer 71 call WriteString 72 call Crlf 73 74 close_file: 75 mov eax, fileHandle 76 call CloseFile 77 78 quit: 79 call WaitMsg 80 exit 81 main ENDP 82 END main
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