asm汇编源代码之文件操作相关

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| 提供7个子程序: 　　1. 关闭文件 FCLOSE 　　2. 打开文件 FOPEN 　　3. 文件大小 FSIZE 　　4. 读文件 FREAD 　　5. 写文件 FWRITE 　　6. 建立文件 FCREATE 　　7. 读取或设置文件指针 FPOS 具体功能及参数描述如下 |----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ; ---------------------------- FCLOSE　PROC　　FAR ; IN: ;　　 AX=FILE NUMBER ; ____________________________ FOPEN　 PROC　　FAR ; IN: ;　　 DS:DX=FILE NAME ;　　 AL=OPEN MODE ; OUT: ;　　 CF=0　 AX=FILE NUM ;　　 CF=1　 AX=ERROR CODE ; ____________________________ FSIZE　 PROC　　FAR ; IN: ;　　 AX=FILE NUM ; OUT: ;　　 CF=0　DX:AX=FILE_SIZE ;　　 CF=1　AX=ERROR CODE ; ____________________________ FREAD　 PROC　　NEAR ; IN: ;　　 DS:DX=DATA BUFFER ;　　 AX=FILE NUM ;　　 CX=LENGTH ;　　 CF=0　AX=READ SIZE ;　　 CF=1　AX=ERROR CODE ; ____________________________ FWRITE　PROC　　FAR ; IN: ;　　 DS:DX=DATA BUFFER ;　　 AX=FILE NUM ;　　 CX=LENGTH ; OUT: ;　　 CF=0　AX=WRITE SIZE ;　　 CF=1　AX=ERROR CODE ; ____________________________ FCREATE PROC　　FAR ; IN: ;　　 DS:DX=FILE NAME ; OUT: ;　　 CF=0　AX=FILE NUM ;　　 CF=1　AX=ERROR CODE ; ____________________________ FPOS　　PROC　　FAR ; IN: ;　　 AL=MODE ;　　 BX=FILE NUM ;　　 CX:DX=NEW POSITION ; OUT: ;　　 DX:AX=NEW POSITION 　 | ; more source code at http://www.ahjoe.com/source/srcdown.asp PUBLIC FOPEN, FSIZE, FREAD, FWRITE, FCREATE, FPOS, FCLOSE CODE SEGMENT ASSUME CS:CODE FCLOSE PROC FAR ; IN: ; AX=FILE NO. PUSH BX MOV BX, AX MOV AH, 3EH INT 21H POP BX RETF FCLOSE ENDP FOPEN PROC FAR ; IN: ; DS:DX=FILE NAME ; AL=OPEN MODE ; OUT: ; CF=0 AX=FILE NUM ; CF=1 AX=ERROR CODE MOV AH, 3DH INT 21H RETF FOPEN ENDP FSIZE PROC FAR ; IN: ; AX=FILE NUM ; OUT: ; CF=0 DX:AX=FILE_SIZE ; CF=1 AX=ERROR CODE PUSH BX PUSH CX MOV BX, AX MOV AX, 4202H XOR CX, CX MOV DX, CX INT 21H PUSH AX PUSH DX MOV CX, 0 MOV DX, 0 MOV AX, 4200H INT 21H POP DX POP AX POP CX POP BX RETF FSIZE ENDP FREAD PROC NEAR ; IN: ; DS:DX=DATA BUFFER ; AX=FILE NUM ; CX=LENGTH ; OUT: ; CF=0 AX=READ SIZE ; CF=1 AX=ERROR CODE PUSH BX MOV BX, AX MOV AH, 3FH INT 21H POP BX RETF FREAD ENDP FWRITE PROC FAR ; IN: ; DS:DX=DATA BUFFER ; AX=FILE NUM ; CX=LENGTH ; OUT: ; CF=0 AX=WRITE SIZE ; CF=1 AX=ERROR CODE PUSH BX MOV BX, AX MOV AH, 40H INT 21H POP BX RETF FWRITE ENDP FCREATE PROC FAR ; IN: ; DS:DX=FILE NAME ; OUT: ; CF=0 AX=FILE NUM ; CF=1 AX=ERROR CODE MOV CX, 0 MOV AH, 3CH INT 21H RETF FCREATE ENDP FPOS PROC FAR ; IN: ; AL=MODE ; BX=FILE NUM ; CX:DX=NEW POSITION ; OUT: ; DX:AX=NEW POSITION MOV AH,42H INT 21H RETF FPOS ENDP CODE ENDS END FOPEN |