C语言函数大全(s开头)

C语言函数大全(s开头)(1)

函数名：sbrk

功能：改变数据段空间位置

用法：char*sbrk(intincr);

程序例：

include

#include

intmain(void)

{

printf(nChangingallocationwithsbrk()\nn);

printf(HBeforesbrk()call:%lubytesfree\nH,

(unsignedlong)coreleft());

sbrk(1000);

printf(HAftersbrk()call:%lubytesfree\n",

(unsignedlong)coreleft());

return0;

)

函数名：scanf

功能：执行格式化输入

用法:intscanf(char*format[,argument,...]);

程序例:

include

#include

intmain(void)

{

charlabel[20];

charname[20];

intentries=0;

intloop,age;

doublesalary;

structEntry_struct

(

charname[20];

intage;

floatsalary;

}entry[20];

/*Inputalabelasastringofcharactersrestrictingto20characters*/

printf(H\n\nPleaseenteralabelforthechart:”)；

scanf(',%20s,',label);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*Inputnumberofentriesasaninteger*/

printf(HHowmanyentrieswilltherebe?(lessthan20)");

scanf("%dM,&entries);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*inputanamerestrictinginputtoonlylettersupperorlowercase*/

for(loop=0;loop

(

printf("Entry%d\nn,loop);

printf(HName:”)；

scanf(H%[A-Za-z]",entry[loop].name);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*inputanageasaninteger*/

printf(HAge:");

scanf("%dH,&entry[loop].age);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*inputasalaryasafloat*/

printfCSalary:");

scanf("%f,&entry[loop].salary);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

)

/*Inputaname,ageandsalaryasastring,integer,anddouble*/

printf(H\nPleaseenteryourname,ageandsalary\nn);

scanf("%20s%d%lf,name,&age,&salary);

rPrintoutthedatathatwasinput*/

printf(H\n\nTable%s\nH,label);

printf("Compiledby%sage%d$%15.2lf\n",name,age,salary);

printf(M\n");

for(loop=0;loop

printf("%4d|%-20s|%5d|%15.2lf\nH,

loop+1,

entry[loop].name,

entry[loop].age,

entryfloop].salary);

printf(H\nH);

return0;

)

函数名：searchpath

功能：搜索DOS路径

用法：char*searchpath(char*filename);

程序例:

include

#include

intmain(void)

{

char*p;

/*LooksforTLINKandreturnsapointer

tothepath*/

p=searchpathCTLINK.EXE");

printf(nSearchforTLINK.EXE:%s\n",p);

/*Looksfornon-existentfile*/

p=searchpath("NOTEXIST.FILn);

printf(nSearchforNOTEXIST.FIL:%s\n",p);

return0;

)

函数名：sector

功能：画并填充椭圆扇区

用法：voidfarsector(intx,inty,intstangle,intendangle);

程序例:

include

#include

#include

#include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmidx,midy,i;

intstangle=45,endangle=135;

intxrad=100,yrad=50;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,”")；

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

/*loopthroughthefillpatterns*/

for(i=EMPTY_FILL;i

(

/*setthefillstyle*/

setf川style。，getmaxcolor());

/*drawthesectorslice*/

sector(midx,midy,stangle,endangle,xrad,yrad);

getch();

}

/*cleanup*/

closegraph();

return0;

)

函数名：segread

功能：读段寄存器值

用法：voidsegread(structSREGS*segtbl);

程序例：

include

include

intmain(void)

(

structSREGSsegs;

segread(&segs);

printf(HCurrentsegmentregistersettings\n\nH);

printf("CS:%XDS:%X\n”，segs.cs,segs.ds);

printf(*'ES:%XSS:%X\n",segs.es,segs.ss);

return0;

}

函数名：setactivepage

功能：设置图形输出活动页

用法：voidfarsetactivepage(intpagenum);

程序例：

#include

#include

include

#include

intmain(void)

{

/*selectadriverandmodethatsupports*/

/*multiplepages.*/

intgdriver=EGA,gmode=EGAHI,errorcode;

intx,y,ht;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,H,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(*'Graphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

x=getmaxx()/2;

y=getmaxy()/2;

ht=textheight(nW");

/*selecttheoffscreenpagefordrawing*/

setactivepage(l);

/*drawalineonpage#1*/

line(0,0,getmaxx(),getmaxy());

/*outputamessageonpage#1*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(x,y,"Thisispage#1:”)；

outtextxy(x,y+ht,"Pressanykeytohalt:");

/*selectdrawingtopage#0*/

setactivepage(O);

routputamessageonpage#0*/

outtextxy(x,y,"Thisispage#0.H);

outtextxy(x,y+ht,"Pressanykeytoviewpage#1

getch();

rselectpage#1asthevisiblepage*/

setvisualpage(l);

/*cleanup*/

getch();

closegraph();

return0;

}

函数名：setallpallette

功能：按指定方式改变所有的调色板颜色

用法:voidfarsetallpallette(structpalette,far*pallette);

程序例：

include

include

include

include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

structpalettetypepal;

intcolor,maxcolor,ht;

inty=10;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,m,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\nn,grapherrormsg(errorcode));

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

maxcolor=getmaxcolor();

ht=2*textheight(HW");

/*grabacopyofthepalette*/

getpalette(&pal);

/*displaythedefaultpalettecolors*/

for(color=1;color<=maxcolor;color++)

{

setcolor(color);

sprintf(msg,"Color:%dH,color);

outtextxy(1,y,msg);

y+=ht;

)

/*waitforakey*/

getch();

/*blackoutthecolorsonebyone*/

for(color=1;color<=maxcolor;color++)

(

setpalette(color,BLACK);

getch();

)

/*restorethepalettecolors*/

setallpalette(&pal);

/*cleanup*/

getch();

closegraph();

return0;

)

函数名:setaspectratio

功能：设置图形纵横比

用法：voidfarsetaspectratio(intxasp,intyasp);

程序例：

include

include

#include

//include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intxasp,yasp,midx,midy;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,H,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(,,Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

setcolor(getmaxcolor());

/*getcurrentaspectratiosettings*/

getaspectratio(&xasp,&yasp);

/*drawnormalcircle*/

circle(midx,midy,100);

getch();

/*claerthescreen*/

cleardevice();

/*adjusttheaspectforawidecircle*/

setaspectratio(xasp/2,yasp);

circle(midx,midy,100);

getch();

/*adjusttheaspectforanarrowcircle*/

cleardevice();

setaspectratio(xasp,yasp/2);

circle(midx,midy,100);

/*cleanup*/

getch();

closegraph();

return0;

)

函数名：setbkcolor

功能：用调色板设置当前背景颜色

用法：voidfarsetbkcolor(intcolor);

程序例：

include

include

include

include

intmain(void)

(

/*selectadriverandmodethatsupports*/

/*multiplebackgroundcolors.*/

intgdriver=EGA,gmode=EGAHI,errorcode;

intbkcol,maxcolor,x,y;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,"n);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

/*maximumcolorindexsupported*/

maxcolor=getmaxcolor();

/*forcenteringtextmessages*/

settextjustify(CENTER_TEXT,CENTER.TEXT);

x=getmaxx()/2;

y=getmaxy()/2;

/*loopthroughtheavailablecolors*/

for(bkcol=0;bkcol<=maxcolor;bkcol++)

(

/*clearthescreen*/

cleardevice();

/*selectanewbackgroundcolor*/

setbkcolor(bkcol);

/*outputamesssage*/

if(bkcol==WHITE)

setcolor(EGA_BLUE);

sprintf(msg,'Backgroundcolor:%d”,bkcol);

outtextxy(x,y,msg);

getch();

)

/*cleanup*/

closegraph();

return0;

)

函数名：setblock

功能：修改先前已分配的DOS存储段大小

用法：intsetblock(intseg,intnewsize);

程序例：

include

#include

#include

include

intmain(void)

(

unsignedintsize,segp;

intstat;

s泛e=64;/*(64x16)=1024bytes7

stat=allocmem(size,&segp);

if(stat==-1)

printf(MAllocatedmemoryatsegment:%X\nM,segp);

else

(

printf(HFailed:maximumnumberofparagraphsavailableis%d\n",

stat);

exit(1);

}

stat=setblock(segp,size*2);

if(stat==-1)

printf("Expandedmemoryblockatsegment:%X\n",segp);

else

printf("Failed:maximumnumberofparagraphsavailableis%d\n",

stat);

freemem(segp);

return0;

)

函数名：setbuf

功能：把缓冲区与流相联

用法：voidsetbuf(FILE*steam,char*buf);

程序例：

#include

/*BUFSIZisdefinedinstdio.h*/

charoutbuf[BUFSIZ];

intmain(void)

/*attachabuffertothestandardoutputstream*/

setbuf(stdout,outbuf);

/*putsomecharactersintothebuffer*/

puts("Thisisatestofbufferedoutput.\n\nn);

puts("Thisoutputwillgointooutbuf\n");

puts(Handwon'tappearuntilthebuffer\nn);

puts("fillsuporweflushthestream.\nH);

/*flushtheoutputbuffer*/

fflush(stdout);

return0;

)

函数名：setcbrk

功能：设置Control-break

用法：intsetcbrk(intvalue);

程序例：

include

#include

#include

intmain(void)

intbreak_flag;

printf(nEnter0toturncontrolbreakoff\nn);

printf(HEnter1toturncontrolbreakon\nn);

break_flag=getch()-0;

setcbrk(break_flag);

if(getcbrk())

printf("Cntrl-brkflagison\n");

else

printf(HCntrl-brkflagisoff\n");

return0;

)

函数名：setcolor

功能：设置当前画线颜色

用法：voidfarsetcolor(intcolor);

程序例:

include

#include

#include

#include

intmain(void)

(

/*selectadriverandmodethatsupports*/

/*multipledrawingcolors.*/

intgdriver=EGA,gmode=EGAHI,errorcode;

intcolor,maxcolor,x,y;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,”")；

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

/*maximumcolorindexsupported*/

maxcolor=getmaxcolor();

/*forcenteringtextmessages*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

x=getmaxx()/2;

y=getmaxy()/2;

/*loopthroughtheavailablecolors*/

for(color=1;color<=maxcolor;color++)

(

rclearthescreen*/

cleardevice();

/*selectanewbackgroundcolor7

setcolor(color);

/*outputamesssage*/

sprintf(msg,"Color:%d",color);

outtextxy(x,y,msg);

getch();

}

/*cleanup*/

closegraph();

return0;

)

函数名：setdate

功能：设置DOS日期

用法：voidsetdate(structdate*dateblk);

程序例：

//include

include

include

intmain(void)

(

structdatereset;

structdatesave_date;

getdate(&save_date);

printfC'Originaldate:\nn);

system("date");

reset.da_year=2001;

reset.da_day=1;

reset.da_mon=1;

setdate(&reset);

printf(HDateaftersetting:\nH)；

system("date");

setdate(&save_date);

printfC'Backtooriginaldate:\nn);

system("date");

return0;

)

函数名：setdisk

功能：设置当前磁盘驱动器

用法：intsetdisk(intdrive);

程序例：

#include

include

intmain(void)

intsave,disk,disks;

/*saveoriginaldrive*/

save=getdisk();

/*printnumberoflogicdrives*/

disks=setdisk(save);

printf(n%dlogicaldrivesonthesystem\n\n",disks);

/*printthedrivelettersavailable*/

printf(HAvailabledrives:\nn);

for(disk=0;disk<26;++disk)

(

setdisk(disk);

if(disk==getdisk())

printf("%c:driveisavailable\nH,disk+*a');

)

setdisk(save);

return0;

)

函数名：setdta

功能：设置磁盘传输区地址

用法：voidsetdta(charfar*dta);

程序例:

include

#include

#include

#include

intmain(void)

(

charline[80],far*save_dta;

charbuffer[256]="SETDTAtest!'1;

structfcbblk;

intresult;

/*getnewfilenamefromuser*/

printf(nEnterafilenametocreate:'1);

gets(line);

/*parsethenewfilenametothedta*/

parsfnm(line,&blk,1);

printf(H%d%s\n",blk.fcb_drive,blk.fcb_name);

/*requestDOSservicestocreatefile*/

if(bdosptr(0x16,&blk,0)==-1)

perror(uErrorcreatingfile");

exit(1);

)

/*saveolddtaandsetnewdta*/

save_dta=getdta();

setdta(buffer);

/*writenewrecords*/

blk.fcb_recsize=256;

blk.fcb_random=OL;

result=randbwr(&blk,1);

printf("result=%d\nH,result);

if(iresult)

printf(HWriteOK\n");

else

(

perror("Diskerror")；

exit(1);

)

rrequestDOSservicestoclosethefile*/

if(bdosptr(0x10,&blk,0)==-1)

perror("Errorclosingfile");

exit(1);

)

/*resettheolddta*/

setdta(save_dta);

return0;

)

函数名：setfillpattern

功能：选择用户定义的填充模式

用法：voidfarsetfillpattern(charfar*upattern,intcolor);

程序例：

include

include

include

include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmaxx,maxy;

/*auserdefinedfillpattern*/

charpattern[8]={0x00,0x70,0x20,0x27,0x24,0x24,0x07,0x00};

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,"n);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

maxx=getmaxx();

maxy=getmaxy();

setcolor(getmaxcolor());

/*selectauserdefinedfillpattern*/

setfi11pattern(pattern,getmaxcolor());

/*fillthescreenwiththepattern*/

bar(0,0,maxx,maxy);

/*cleanup*/

getch();

closegraph();

return0;

}

函数名：setfillstyle

功能：设置填充模式和颜色

用法：voidfarsetfillstyle(intpattern,intcolor);

程序例：

include

include

include

include

include

/*thenamesofthefillstylessupported*/

char*fname[]={nEMPTY_FILL",

HSOLID_FILL",

nLINE_FILLn,

HLTSLASH_FILL",

,'SLASH.FILL",

"BKSLASH.FILL",

HLTBKSLASH_FILLH,

"HATCH_FILLH,

,'XHATCH.FILL",

HINTERLEAVE_FILL",

,'WIDE.DOT.FILL",

"CLOSE_DOT_FILL",

HUSER_FILLH

)；

intmain(void)

{

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

charstylestr[40];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,H,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

printf("Graphicserror:%s\n",grapherrormsg(errorcode));

printf(,,Pressanykeytohalt:'*);

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

for(style=EMPTY_FILL;style<USER_FILL;style++)

(

/*selectthefillstyle*/

setfillstyle(style,getmaxcolor());

/*convertstyleintoastring*/

strcpy(stylestr,fname[style]);

/*fillabar*/

bar3d(0,0,midx-10,midy,0,0);

routputamessage*/

outtextxy(midx,midy,stylestr);

/*waitforakey*/

getch();

cleardevice();

)

/*cleanup*/

getch();

closegraph();

return0;

)

函数名：setftime

功能：设置文件日期和时间

用法：intsetftime(inthandle,structftime*ftimep);

程序例：

include

include

include

include

intmain(void)

(

structftimefilet;

FILE*fp;

if((fp=fopen("TEST.$$$n,Hw"))==NULL)

perror('^Error:,,);

exit(1);

}

fprintf(fp,"testing...\nn);

rloadftimestructurewithnewtimeanddate*/

filet.ft_tsec=1;

filet.ft_min=1;

filet.ft_hour=1;

filet.ft_day=1;

filet.ft_month=1;

filet.ft_year=21;

/*showcurrentdirectoryfortimeanddate*/

system(ndirTEST.$$$");

/*changethetimeanddatestamp*/

setftime(fileno(fp),&filet);

/*closeandremovethetemporaryfile*/

fclose(fp);

system("dirTEST.$$$");

unlink("TEST.$$$n);

return0;

}

函数名：setgraphbufsize

功能：改变内部图形缓冲区的大小

用法：unsignedfarsetgraphbufsize(unsignedbufsize);

程序例：

include

include

include

include

#defineBUFSIZE1000/*internalgraphicsbuffersize*/

intmain(void)

{

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intx,y,oldsize;

charmsg[80];

/*setthesizeoftheinternalgraphicsbuffer*/

/*beforemakingacalltoinitgraph.*/

oldsize=setgraphbufsize(BUFSIZE);

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,m);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\nn,grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

x=getmaxx()/2;

y=getmaxy()/2;

/*outputsomemessages*/

sprintf(msg,''Graphicsbuffersize:%d",BUFSIZE);

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(x,y,msg);

sprintf(msg,"Oldgraphicsbuffersize:%dH,oldsize);

outtextxy(x,y+textheight("W"),msg);

/*cleanup*/

getch();

closegraph();

return0;

)

函数名：setgraphmode

功能：将系统设置成图形模式且清屏

用法：voidfarsetgraphmode(intmode);

程序例：

include

include

include#include

intmain(void)

{

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intx,y;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,m,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\nn,grapherrormsg(errorcode));

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

x=getmaxx()/2;

y=getmaxy()/2;

/*outputamessage*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(x,y,"Pressanykeytoexitgraphics:");

getch();

/*restoresystemtotextmode*/

restorecrtmode();

printf(HWe'renowintextmodeAn");

printf(,,Pressanykeytoreturntographicsmode:");

getch();

/*returntographicsmode*/

setgraphmode(getgraphmode());

/*outputamessage*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(x,y,"We'rebackingraphicsmode.1');

outtextxy(x,y+textheight(nW"),"Pressanykeytohalt:");

/*cleanup*/

getch();

closegraph();

return0;

)

函数名：setjmp

功能：非局部转移

用法：intsetjmp(jmp_bufenv);

程序例:

include

#include

//include

voidsubroutine(void);

jmp_bufjumper;

intmain(void)

(

intvalue;

value=setjmp(jumper);

if(value!=0)

{

printf(HLongjmpwithvalue%d\nH,value);

exit(value);

)

printf(nAbouttocallsubroutine...\n");

subroutine();

return0;

)

voidsubroutine(void)

Iongjmp(jumper,1);

)

函数名：setlinestyle

功能：设置当前画线宽度和类型

用法：voidfarsetlinestyle(intlinestype,unsignedupattern);

程序例：

include

include

//include

include

include

rthenamesofthelinestylessupported7

char*lname[]={

HSOLID_LINEH,

"DOTTED_LINEH,

HCENTER_LINEH,

"DASHED_LINEH,

nUSERBIT_LINE'

);

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy,userpat;

charstylestr[40];

rinitializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,H,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

/*auserdefinedlinepattern*/

rbinary:n0000000000000001"*/

userpat=1;

for(style=SOLID_LINE;style<=USERBIT_LINE;style++)

{

/*selectthelinestyle*/

setlinestyle(style,userpat,1);

/*convertstyleintoastring*/

strcpy(stylestr,lname[style]);

/*drawaline*/

line(0,0,midx-10,midy);

/*drawarectangle*/

rectangle(0,0,getmaxx(),getmaxy());

/*outputamessage*/

outtextxy(midx,midy,stylestr);

/*waitforakey*/

getch();

cleardevice();

)

/*cleanup*/

closegraph();

return0;

)

函数名：setmem

功能：存值到存储区

用法：voidsetmem(void*addr,intlen,charvalue);

程序例：

include

include

include

intmain(void)

(

char*dest;

dest=calloc(21,sizeof(char));

setmem(dest,20,'c');

printf(^'%s\n,^,dest);

return0;

)

函数名：setmode

功能：设置打开文件方式

用法：intsetmode(inthandle,unsignedmode);

程序例：

include

//include

include

intmain(void)

(

intresult;

result=setmode(fileno(stdprn),O_TEXT);

if(result==-1)

perror("Modenotavailable\nn);

else

printff'Modesuccessfullyswitched\n");

return0;

}

函数名：setpalette

功能：改变调色板的颜色

用法：voidfarsetpalette(intindex,intactural_color);

程序例：

include

include

//include

include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intcolor,maxcolor,ht;

inty=10;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,m,);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\nn,grapherrormsg(errorcode));

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

maxcolor=getmaxcolor();

ht=2*textheight("W");

/*displaythedefaultcolors*/

for(color=1;color<=maxcolor;color++)

(

setcolor(color);

sprintf(msg,"Color:%d",color);

outtextxy(1,y,msg);

y+=ht;

)

/*waitforakey*1

getch();

/*blackoutthecolorsonebyone*/

for(color=1;color<=maxcolor;color++)

(

setpalette(color,BLACK);

getch();

)

I*cleanup*/

closegraph();

return0;

)

函数名：setrgbpalette

功能：定义旧M8514图形卡的颜色

用法:voidfarsetrgbpalette(intcolornum,intred,intgreen,intblue);

程序例：

include

include

include

include

intmain(void)

/*selectadriverandmodethatsupportstheuse*/

/*ofthesetrgbpalettefunction.*/

intgdriver=VGA,gmode=VGAHI,errorcode;

structpalettetypepal;

inti,ht,y,xmax;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\n"，grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

/*grabacopyofthepalette*/

getpalette(&pal);

/*creategrayscale*/

for(i=0;i

setrgbpalette(pal.colors[i],i*4,i*4,i*4);

rdisplaythegrayscale*/

ht=getmaxy()/16;

xmax=getmaxx();

y=o；

for(i=0;i

(

setfillstyle(SOLID_FILL,i);

bar(0,y,xmax,y+ht);

y+=ht;

)

/*cleanup*/

getch();

closegraph();

return0;

)

函数名：settextjustify

功能：为图形函数设置文本的对齐方式

用法：voidfarsettextjustify(inthoriz,intvert);

程序例：

include

include

#include

include

rfunctionprototype*/

voidxat(intx,inty);

/*horizontaltextjustificationsettings*/

char*hjustQ={"LEFT_TEXT",

nCENTER_TEXT",

"RIGHT_TEXTn

}；

/*verticaltextjustificationsettings*/

char*vjust[]={“LEFT_TEXT”，

HCENTER_TEXT",

"RIGHT_TEXTn

);

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmidx,midy,hj,vj;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

rreadresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

{

printf(HGraphicserror:%s\n",grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

/*loopthroughtextjustifications*/

for(hj=LEFT_TEXT;hj<=RIGHT_TEXT;hj++)

for(vj=LEFT_TEXT;vj<=RIGHT_TEXT;vj++)

cleardevice();

/*setthetextjustification*/

settextjustify(hj,vj);

/*createamessagestring*/

sprintf(msg,H%s%s"，hjust[hj],vjust[vj]);

rcreatecrosshairsonthescreen*/

xat(midx,midy);

/*outputthemessage*/

outtextxy(midx,midy,msg);

getch();

)

/*cleanup*/

closegraph();

return0;

)

/*drawan"x"at(x,y)*/

voidxat(intx,inty)

line(x-4,y,x+4,y);

Iine(x,y-4,x,y+4);

)

函数名：settextstyle

功能：为图形输出设置当前的文本属性

用法：voidfarsettextstyle(intfont,intdirection,charsize);

程序例：

include

include

//include

include

/*thenamesofthetextstylessupported7

char*fname[]={"DEFAULTfont”,

,'TRIPLEXfont',,

,'SMALLfont1',

"SANSSERIFfont",

"GOTHICfont'1

}；

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

intsize=1;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,m);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf(HGraphicserror:%s\n"，grapherrormsg(errorcode));

printf(HPressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

settextjustify(CENTER_TEXT,CENTER_TEXT);

/*loopthroughtheavailabletextstyles*/

for(style=DEFAULT_FONT;style<=GOTHIC_FONT;style++)

cleardevice();

if(style==TRIPLEX_FONT)

size=4;

/*selectthetextstyle*/

settextstyle(style,HORIZ_DIR,size);

/*outputamessage*/

outtextxy(midx,midy,fname[style]);

getch();

)

/*cleanup*/

closegraph();

return0;

)

函数名：settextstyle

功能：为图形输出设置当前的文本属性

用法：voidfarsettextstyle(intfont,intdirection,charsize);

程序例：

#include

#include

include

#include

/*thenamesofthetextstylessupported*/

char*fname[]={"DEFAULTfont”，

,'TRIPLEXfont'1,

"SMALLfont1',

“SANSSERIFfont",

"GOTHICfont'1

)；

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

intsize=1;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

printf(HGraphicserror:%s\nn,grapherrormsg(errorcode));

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

settextjustify(CENTER_TEXT,CENTER_TEXT);

/*loopthroughtheavailabletextstyles*/

for(style=DEFAULT_FONT;style<=GOTHIC_FONT;style++)

(

cleardevice();

if(style==TRIPLEX.FONT)

size=4;

/*selectthetextstyle*/

settextstyle(style,HORIZ_DIR,size);

/*outputamessage*/

outtextxy(midx,midy,fname[style]);

getch();

)

/*cleanup*/

closegraph();

return0;

)

函数名：settime

功能：设置系统时间

用法：voidsettime(structtime*timep);

程序例：

include

include

intmain(void)

(

structtimet;

gettime(&t);

printf("Thecurrentminuteis:%d\nH,t.ti_min);

printf("Thecurrenthouris:%d\n",t.ti_hour);

printf("Thecurrenthundredthofasecondis:%d\n",t.ti_hund);

printf("Thecurrentsecondis:%d\n”，t.ti_sec);

/*Addonetotheminutesstructelementandthencallsettime*/

settime(&t);

return0;

)

函数名：setusercharsize

功能：为矢量字体改变字符宽度和高度

用法：voidfarsetusercharsize(intmultx,intdirx,intmulty,intdiry);

程序例：

include

include

include

#include

intmain(void)

{

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,,,M);

/*readresultofinitialization*/

errorcode=graphresult();

if(errorcode!=grOk)/*anerroroccurred*/

(

printf("Graphicserror:%s\nn,grapherrormsg(errorcode));

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

}

/*selectate