C語言函數(shù)大全(s開頭)(1)

函數(shù)名：sbrk

功能：改變數(shù)據(jù)段空間位置

用法：char*sbrk(intincr);

程序例：

/include

/include

intmain(void)

{

printf("Changingallocationwithsbrk()\n");

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

(unsignedlong)coreleft());

sbrk(WOO);

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

(unsignedlong)coreleft());

return0;

)

函數(shù)名:scant

功能：執(zhí)行格式化輸入

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("\n\nPleaseenteralabelforthechart:");

scanf("%20s",label);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*Inputnumberofentriesasaninteger*/

printf("Howmanyentrieswilltherebe?(lessthan20)")；

scanf("%d",&entries);

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*inputanamerestrictinginputtoonlylettersupperorlowercase*/

for(loop=0;loop

(

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

printf("Name:");

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

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

/*inputanageasaninteger*/

printf("Age:”)；

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

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

rinputasalaryasafloat*/

printf("Salary:");

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

fflush(stdin);/*flushtheinputstreamincaseofbadinput*/

)

/*Inputaname,ageandsalaryasastring,integer,anddouble*/

printf("\nPleaseenteryourname,ageandsalary\n");

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

/*Printoutthedatathatwasinput7

printf("\n\nTable%s\n",label);

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

printf("\n");

for(loop=0;loop

printf("%4d|%-20s|%5d|%15.2lf\n';

loop+1,

entry[loop].name,

entry[loop].age,

entry[loop].salary);

printf("\n");

return0;

)

函數(shù)名：searchpath

功能：搜索DOS路徑

用法：char*searchpath(char*filename);

程序例：

//include

include

intmain(void)

{

char*p;

I*LooksforTLINKandreturnsapointer

tothepath*/

p=searchpath("TLINK.EXEH);

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

rLooksfornon-existentfile*/

p=searchpath("NOTEXIST.FIL");

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

return0;

)

函數(shù)名：sector

功能：畫并填充橢圓扇區(qū)

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

/*loopthroughthefillpatterns*/

for(i=EMPTY_FILL;i

(

/*setthefillstyle*/

setfillstyle(i,getmaxcolor());

/*drawthesectorslice*/

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

getch();

)

rcleanup*/

closegraph();

return0;

)

函數(shù)名：segread

功能：讀段寄存器值

用法：voidsegread(structSREGS*segtbl);

程序例：

include

/include

intmain(void)

(

structSREGSsegs;

segread(&segs);

printf("Currentsegmentregistersettings\n\n");

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

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

return0;

)

函數(shù)名：setactivepage

功能：設(shè)置圖形輸出活動頁

用法：voidfarsetactivepage(intpagenum);

程序例：

include

include

//include

include

intmain(void)

{

/*selectadriverandmodethatsupports*/

/*multiplepages.7

intgdriver=EGA,gmode=EGAHI,errorcode;

intx,y,ht;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

x=getmaxx()/2;

y=getmaxy()/2;

ht=textheight("W");

/*selecttheoffscreenpagefordrawing*/

setactivepage(l);

/*drawalineonpage#1*/

line(0,0,getmaxx(),getmaxyO);

routputamessageonpage#1w/

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.");

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

getch();

/*selectpage#1asthevisiblepage*/

setvisualpage(l);

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：setallpallette

功能：按指定方式改變所有的調(diào)色板顏色

用法：voidfarsetallpallette(structpalette,far*pallette);

程序例：

/include

include

/include

/include

intmain(void)

(

rrequestautodetection*/

intgdriver=DETECT,gmode,errorcode;

structpalettetypepal;

intcolor,maxcolor,ht;

inty=10;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization7

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode7

)

maxcolor=getmaxcolor();

ht=2*textheight("W");

/*grabacopyofthepalette*/

getpalette(&pal);

/*displaythedefaultpalettecolors*/

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

(

setcolor(color);

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

outtextxy(1,y,msg);

y+=ht;

)

/*waitforakey*/

getch();

/*blackoutthecolorsonebyone*/

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

(

setpalette(color,BLACK):

getch();

)

/*restorethepalettecolors*/

setallpalette(&pal);

rcleanup*/

getch();

closegraph();

return0;

)

函數(shù)名:setaspectratio

功能：設(shè)置圖形縱橫比

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,

rreadresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

setcolor(getmaxcolor());

/*getcurrentaspectratiosettings*/

getaspectratio(&xasp,&yasp);

rdrawnormalcircle7

circle(midx,midy,100);

getch();

/*claerthescreen*/

cleardevice();

/*adjusttheaspectforawidecircle*/

setaspectratio(xasp/2,yasp);

circle(midx,midy,100);

getch();

/*adjusttheaspectforanarrowcircle*/

cleardevice();

setaspectratio(xasp,yasp/2);

circlefmidx,midy,100);

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：setbkcolor

功能：用調(diào)色板設(shè)置當前背景顏色

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,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

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;

)

函數(shù)名：setblock

功能：修改先前已分配的DOS存儲段大小

用法：intsetblock(intseg,intnewsize);

程序例：

include

#include

include

include

intmain(void)

(

unsignedintsize,segp;

intstat;

size=64;/*(64x16)=1024bytes*/

stat=allocmem(size,&segp);

if(stat==-1)

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

else

(

printf("Failed: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;

)

函數(shù)名：setbuf

功能：把緩沖區(qū)與流相聯(lián)

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\n");

puts("Thisoutputwillgointooutbuf\n");

puts("andwon'tappearuntilthebuffer\nM);

puts("fillsuporweflushthestreamAn");

/*flushtheoutputbuffer7

fflush(stdout);

return0;

)

困數(shù)名：setcbrk

功能:設(shè)置Control-break

用法：intsetcbrk(intvalue);

程序例：

include

//include

include

intmain(void)

intbreak_flag;

printf("Enter0toturncontrolbreakoff\n");

printf("Enter1toturncontrolbreakon\n");

break_flag=getch()-0;

setcbrk(break_flag);

if(getcbrk())

printf("Cntrl-brkflagison\n");

else

printf("Cntrl-brkflagisoffn");

return0;

)

函數(shù)名：setcolor

功能：設(shè)置當前畫線顏色

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("Graphicserror:%s\nH,grapherrormsg(errorcodej);

printf("Pressanykeytohalt:");

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++)

(

/*clearthescreen*/

cleardevice();

/*selectanewbackgroundcolor*/

setcolor(color);

/*outputamesssage*/

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

outtextxy(x,y,msg);

getch();

)

/*cleanup*/

closegraph();

return0;

)

函數(shù)名：setdate

功能：設(shè)置DOS日期

用法：voidsetdate(struddate*dateblk);

程序例：

include

/include

include

intmain(void)

(

structdatereset;

structdatesave_date;

getdate(&save_date);

printf("Originaldate:\n");

system("date");

reset.da_year=2001;

reset.da_day=1;

reset.da_mon=1;

setdate(&reset);

printf("Dateaftersetting:\n");

system("date");

setdate(&save_date);

printf("Backtooriginaldate:\n");

system("date");

return0;

)

函數(shù)名：setdisk

功能：設(shè)置當前磁盤驅(qū)動器

用法：intsetdisk(intdrive);

程序例：

/include

/include

intmain(void)

intsave,disk,disks;

/*saveoriginaldrive*/

save=getdisk();

/*printnumberoflogicdrives*/

disks=setdisk(save);

printf("%dlogicaldrivescnthesystem\n\n'\disks);

/*printthedrivelettersavailable*/

printf("Availabledrives:\n");

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

(

setdisk(disk);

if(disk==getdisk())

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

)

setdisk(save);

return0;

)

函數(shù)名：setdta

功能：設(shè)置磁盤傳輸區(qū)地址

用法：voidsetdta(charfar*dta);

程序例：

//include

include

include

include

intmain(void)

(

charline[80],far*save_dta;

charbuffer[256]="SETDTAtest!”；

structfcbblk;

intresult;

/*getnewfilenamefromuser*/

printf("Enterafilenametocreate:");

gets(line);

/*parsethenewfilenametothedta*/

parsfnm(line,&blk,1);

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

/*requestDOSservicestocreatefile*/

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

perror("Errorcreatingfile');

exit(1);

)

/*saveolddtaandsetnewdta*/

save_dta=getdta();

setdta(buffer);

/*writenewrecords7

blk.fcb_recsize=256;

blk.fcb_random=OL;

result=randbwr(&blk,1);

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

if(Jresult)

printf("WriteOK\n");

else

(

perror("Diskerror");

exit(1);

)

/*requestDOSservicestoclosethefile*/

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

perror("Errorclosingfile");

exit(1);

)

/*resettheolddta*/

setdta(save_dta);

return0;

)

函數(shù)名：setfillpattern

功能：選擇用戶定義的填充模式

用法：voidfarsetfillpattern(charfar*upattern,intcolor);

程序例：

include

include

include

include

intmain(void)

(

I*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmaxx,maxy;

/*auserdefinedfillpattern*/

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

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

maxx=getmaxx();

maxy=getmaxy();

setcolor(getmaxcolor());

/*selectauserdefinedfillpattern*/

setfillpattern(pattern,getmaxcolor());

/*fillthescreenwiththepattern*/

bar(0,0,maxx,maxy);

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名:setfillstyle

功能：設(shè)置填充模式和顏色

用法：voidfarsetfillstylelintpattern,intcolor);

程序例：

/include

include

/include

/include

include

/*thenamesofthefillstylessupported*/

char*fnameO={"EMPTY_FILL",

"SOLID_FILL",

"LINE_FILLH,

"LTSLASH.FILL*',

"SLASH_FILL",

"BKSLASHFILL",

"LTBKSLASH.FILL",

"HATCH_FILL",

"XHATCH_FILLH,

"INTERLEAVE_FILL';

"WIDE_DOT_FILLM,

"CLOSE_DOT_FILL",

"USER.FILL"

)；

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

charstylestr[40];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

midx=getmaxx()/2;

midy=getmaxy()/2;

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

(

/*selectthefillstyle*/

setfillstyle(style,getmaxc3lor());

/*convertstyleintoastring*/

strcpy(stylestr,fname[style]);

/*fillabar*/

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

/*outputamessage*/

outtextxy(midx,midy,stylestr);

/*waitforakey*/

getch();

cleardevice();

)

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：setftime

功能：設(shè)置文件日期和時間

用法：intsetftime(inthandle,structftime*ftimep);

程序例：

include

include

include

include

intmain(void)

(

structftimefilet;

FILE*fp;

if((fp=fopen(nTEST.$$$","wH))==NULL)

perror("Error:");

exit(1);

)

fprintf(fp,"testing..An");

/*loadftimestructurewithnewtimeanddate*/

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*/

systemf'dirTEST.$$$");

/*changethetimeanddatestamp*/

setftime(fileno(fp),&filet);

/*closeandremovethetemporaryfile*/

fclose(fp);

system("dirTEST.$$$H);

unlink("TEST.$$$");

return0;

}

函數(shù)名：setgraphbufsize

功能：改變內(nèi)部圖形緩沖區(qū)的大小

用法：unsignedfarsetgraphbufsize(unsignedbufsize);

程序例：

include

include

/include

include

#defineBUFSIZE1000/*internalgraphicsbuffersize7

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intx,y,oldsize;

charmsg[80];

/*setthesizeoftheinternalgraphicsbuffer*/

/*beforemakingacalltoinitgraph.*/

oldsize=setgraphbufsize(BUFSIZE);

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

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:%d",oldsize);

outtextxy(x,y+textheightf'W"),msg);

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：setgraphmode

功能：將系統(tǒng)設(shè)置成圖形模式且清屏

用法：voidfarsetgraphmode(intmode);

程序例：

include

include

/include#include

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intx,y;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization7

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode7

)

x=getmaxx()/2;

y=getmaxy()/2;

/*outputamessage*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

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

getch();

/*restoresystemtotextmode*/

restorecrtmode();

printf("We'renowintextmodeAn");

printf("Pressanykeytoreturntographicsmode:")；

getch();

/*returntographicsmode*/

setgraphmode(getgraphmode());

/*outputamessage*/

settextjustify(CENTER_TEXT,CENTER_TEXT);

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

outtextxy(x,y+textheightf'W"),"Pressanykeytohalt:");

/*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：setjmp

功能：非局部轉(zhuǎn)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("Longjmpwithvalue%d\n",value);

exit(value);

)

printf("Abouttocallsubroutine...\n");

subroutine();

return0;

)

voidsubroutine(void)

longjmpGumper,1);

}

函數(shù)名:setlinestyle

功能：設(shè)置當前畫線寬度和類型

用法：voidfarsetlinestyle(intlinestype,unsignedupattern);

程序例：

include

include

include

/include

include

/*thenamesofthelinestylessupported*/

char*lname[]={

"SOLID_LINE",

"DOTTED_LINE",

"CENTER.LINE",

"DASHED_LINE",

"USERBIT.LINE"

)；

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy,userpat;

charstylestr[40];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

}

midx=getmaxx()/2;

midy=getmaxy()/2;

/*auserdefinedlinepattern*/

/*binary:"00000000000C0001"*/

userpat=1;

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

(

/*selectthelinestyle*/

setlinestyle(style,userpat,1);

/*convertstyleintoastring7

strcpy(stylestr,lname[style]);

/*drawaline*/

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

/*drawarectangle*/

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

routputamessage*/

outtextxy(midx,midy,stylestr);

/*waitforakey*/

getch();

cleardevice();

)

/*cleanup*/

closegraph();

return0;

)

函數(shù)名：setmem

功能：存值到存儲區(qū)

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

程序例：

/include

include

include

intmain(void)

(

char*dest;

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

setmem(dest,20,'c');

printf("%s\n",dest);

return0;

}

函數(shù)名：setmode

功能：設(shè)置打開文件方式

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\n");

else

printf("Modesuccessfullyswitched\n");

return0;

)

函數(shù)名：setpalette

功能：改變調(diào)色板的顏色

用法：voidfarsetpalettetintindex,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,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

printf("Graphicserror:%s\n",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*/

getch();

/*blackoutthecolorsonebyone*/

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

(

setpalette(color,BLACK)

getch();

}

/*cleanup*/

closegraph();

return0;

)

函數(shù)名：setrgbpalette

功能：定義舊M8514圖形卡的顏色

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,

/*readresultofinitialization7

errorcode=graphresult();

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

(

printf("Graphicserror:%s\nH,grapherrormsg(errorcodei);

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

/*grabacopyofthepalette*/

getpalette(&pal);

/*creategrayscale*/

for(i=0;i

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

/*displaythegrayscale*/

ht=getmaxy()/16;

xmax=getmaxx();

y=o；

for(i=0;i

(

setfillstyle(SOLID_FILL,i);

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

y+=ht;

)

I*cleanup*/

getch();

closegraph();

return0;

)

函數(shù)名：settextjustify

功能：為圖形函數(shù)設(shè)置文本的對齊方式

用法：voidfarsettextjustify(inthoriz,intvert);

程序例：

include

include

include

include

/*functionprototype*/

voidxat(intx,inty);

/*horizontaltextjustificationsettings*/

char*hjust[]={MLEFT_TEXT",

"CENTER_TEXT",

"RIGHT.TEXT'

)；

/*verticaltextjustificationsettings*/

char*vjust[]={"LEFT_TEXT",

"CENTER_TEXT",

"RIGHT_TEXT”

)；

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intmidx,midy,hj,vj;

charmsg[80];

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*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;

/*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,"%s%s",hjust[hj],vjust[vj]);

/*createcrosshairsonthescreen*/

xat(midx,midy);

/*outputthemessage7

outtextxy(midx,midy,msg);

getch();

)

/*cleanup*/

closegraph();

return0;

)

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

voidxat(intx,inty)

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

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

}

函數(shù)名：settextstyle

功能：為圖形輸出設(shè)置當前的文本屬性

用法：voidfarsettextstyls(intfont,intdirection,charsize);

程序例：

include

include

include

include

/*thenamesofthetextstylessupported*/

char*fnameQ={"DEFAULTfont",

"TRIPLEXfont",

"SMALLfont",

"SANSSERIFfont",

"GOTHICfont"

}；

intmain(void)

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

intsize=1;

/*initializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

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*/

settextstylefstyle,HORIZ_DIR,size);

/*outputamessage*/

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

getch();

)

/*cleanup*/

closegraph();

return0;

)

函數(shù)名：settextstyle

功能：為圖形輸出設(shè)置當前的文本屬性

用法：voidfarsettextstyls(intfont,intdirection,charsize);

程序例：

/include

include

//include

include

/*thenamesofthetextstylessupported*/

char*fname[]={"DEFAULTfont1',

"TRIPLEXfont",

"SMALLfont",

"SANSSERIFfont'1,

"GOTHICfont"

)；

intmain(void)

(

/*requestautodetection*/

intgdriver=DETECT,gmode,errorcode;

intstyle,midx,midy;

intsize=1;

rinitializegraphicsandlocalvariables*/

initgraph(&gdriver,&gmode,

/*readresultofinitialization*/

errorcode=graphresult();

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

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

}

midx=getmaxx()/2;

midy=getmaxy()/2;

settextjustify(CENTERTEXT,CENTERTEXT);

rloopthroughtheavailabletextstyles*/

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

(

cleardevice();

if(style==TRIPLEX_FONT)

size=4;

rselectthetextstyle*/

settextstyle(style,HORIZ_DIR,size);

/*outputamessage*/

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

getch();

)

/*cleanup*/

closegraph();

return0;

)

函數(shù)名：settime

功能：設(shè)置系統(tǒng)時間

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\nH,t.ti_sec);

/*Addonetotheminutesstructelementandthencallsettime*/

t.ti_min++;

settime(&t);

return0;

)

函數(shù)名：setusercharsize

功能：為矢量字體改變字符寬度和高度

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,

/*readresultofinitialization*/

errorcode=graphresult();

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

(

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

printf("Pressanykeytohalt:");

getch();

exit(1);/*terminatewithanerrorcode*/

)

/*selecta