函数名: setbkcolor 功 能: 用调色板设置当前背景颜色 用 法: void far setbkcolor(int color); 程序例: <?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office"?>
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int main(void) { /* select a driver and mode that supports */ /* multiple background colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int bkcol, maxcolor, x, y; char msg[80];
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
/* maximum color index supported */ maxcolor = getmaxcolor();
/* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2;
/* loop through the available colors */ for (bkcol=0; bkcol<=maxcolor; bkcol++) { /* clear the screen */ cleardevice();
/* select a new background color */ setbkcolor(bkcol);
/* output a messsage */ if (bkcol == WHITE) setcolor(EGA_BLUE); sprintf(msg, "Background color: %d", bkcol); outtextxy(x, y, msg); getch(); }
/* clean up */ closegraph(); return 0; }
函数名: setblock 功 能: 修改先前已分配的DOS存储段大小 用 法: int setblock(int seg, int newsize); 程序例:
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int main(void) { unsigned int size, segp; int stat;
size = 64; /* (64 x 16) = 1024 bytes */ stat = allocmem(size, &segp); if (stat == -1) printf("Allocated memory at segment: %X\n", segp); else { printf("Failed: maximum number of paragraphs available is %d\n", stat); exit(1); }
stat = setblock(segp, size * 2); if (stat == -1) printf("Expanded memory block at segment: %X\n", segp); else printf("Failed: maximum number of paragraphs available is %d\n", stat);
freemem(segp);
return 0; }
函数名: setbuf 功 能: 把缓冲区与流相联 用 法: void setbuf(FILE *steam, char *buf); 程序例:
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/* BUFSIZ is defined in stdio.h */ char outbuf[BUFSIZ];
int main(void) { /* attach a buffer to the standard output stream */ setbuf(stdout, outbuf);
/* put some characters into the buffer */ puts("This is a test of buffered output.\n\n"); puts("This output will go into outbuf\n"); puts("and won't appear until the buffer\n"); puts("fills up or we flush the stream.\n");
/* flush the output buffer */ fflush(stdout);
return 0; }
函数名: setcbrk 功 能: 设置Control-break 用 法: int setcbrk(int value); 程序例:
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int main(void) { int break_flag;
printf("Enter 0 to turn control break off\n"); printf("Enter 1 to turn control break on\n");
break_flag = getch() - 0;
setcbrk(break_flag);
if (getcbrk()) printf("Cntrl-brk flag is on\n"); else printf("Cntrl-brk flag is off\n"); return 0; }
函数名: setcolor 功 能: 设置当前画线颜色 用 法: void far setcolor(int color); 程序例:
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int main(void) { /* select a driver and mode that supports */ /* multiple drawing colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int color, maxcolor, x, y; char msg[80];
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
/* maximum color index supported */ maxcolor = getmaxcolor();
/* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2;
/* loop through the available colors */ for (color=1; color<=maxcolor; color++) { /* clear the screen */ cleardevice();
/* select a new background color */ setcolor(color);
/* output a messsage */ sprintf(msg, "Color: %d", color); outtextxy(x, y, msg); getch(); }
/* clean up */ closegraph(); return 0; }
函数名: setdate 功 能: 设置DOS日期 用 法: void setdate(struct date *dateblk); 程序例:
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int main(void) { struct date reset; struct date save_date;
getdate(&save_date); printf("Original date:\n"); system("date");
reset.da_year = 2001; reset.da_day = 1; reset.da_mon = 1; setdate(&reset);
printf("Date after setting:\n"); system("date");
setdate(&save_date); printf("Back to original date:\n"); system("date");
return 0; }
函数名: setdisk 功 能: 设置当前磁盘驱动器 用 法: int setdisk(int drive); 程序例:
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int main(void) { int save, disk, disks;
/* save original drive */ save = getdisk();
/* print number of logic drives */ disks = setdisk(save); printf("%d logical drives on the system\n\n", disks);
/* print the drive letters available */ printf("Available drives:\n"); for (disk = 0;disk < 26;++disk) { setdisk(disk); if (disk == getdisk()) printf("%c: drive is available\n", disk + 'a'); } setdisk(save);
return 0; }
函数名: setdta 功 能: 设置磁盘传输区地址 用 法: void setdta(char far *dta); 程序例:
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int main(void) { char line[80], far *save_dta; char buffer[256] = "SETDTA test!"; struct fcb blk; int result;
/* get new file name from user */ printf("Enter a file name to create:"); gets(line);
/* parse the new file name to the dta */ parsfnm(line, &blk, 1); printf("%d %s\n", blk.fcb_drive, blk.fcb_name);
/* request DOS services to create file */ if (bdosptr(0x16, &blk, 0) == -1) { perror("Error creating file"); exit(1); }
/* save old dta and set new dta */ save_dta = getdta(); setdta(buffer);
/* write new records */ blk.fcb_recsize = 256; blk.fcb_random = 0L; result = randbwr(&blk, 1); printf("result = %d\n", result);
if (!result) printf("Write OK\n"); else { perror("Disk error"); exit(1); }
/* request DOS services to close the file */ if (bdosptr(0x10, &blk, 0) == -1) { perror("Error closing file"); exit(1); }
/* reset the old dta */ setdta(save_dta); return 0; }
函数名: setfillpattern 功 能: 选择用户定义的填充模式 用 法: void far setfillpattern(char far *upattern, int color); 程序例:
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int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int maxx, maxy;
/* a user defined fill pattern */ char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00};
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
maxx = getmaxx(); maxy = getmaxy(); setcolor(getmaxcolor());
/* select a user defined fill pattern */ setfillpattern(pattern, getmaxcolor());
/* fill the screen with the pattern */ bar(0, 0, maxx, maxy);
/* clean up */ getch(); closegraph(); return 0; }
函数名: setfillstyle 功 能: 设置填充模式和颜色 用 法: void far setfillstyle(int pattern, int color); 程序例:
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/* the names of the fill styles supported */ char *fname[] = { "EMPTY_FILL", "SOLID_FILL", "LINE_FILL", "LTSLASH_FILL", "SLASH_FILL", "BKSLASH_FILL", "LTBKSLASH_FILL", "HATCH_FILL", "XHATCH_FILL", "INTERLEAVE_FILL", "WIDE_DOT_FILL", "CLOSE_DOT_FILL", "USER_FILL" };
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int style, midx, midy; char stylestr[40];
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
midx = getmaxx() / 2; midy = getmaxy() / 2;
for (style = EMPTY_FILL; style < USER_FILL; style++) { /* select the fill style */ setfillstyle(style, getmaxcolor());
/* convert style into a string */ strcpy(stylestr, fname[style]);
/* fill a bar */ bar3d(0, 0, midx-10, midy, 0, 0);
/* output a message */ outtextxy(midx, midy, stylestr);
/* wait for a key */ getch(); cleardevice(); }
/* clean up */ getch(); closegraph(); return 0; }
函数名: setftime 功 能: 设置文件日期和时间 用 法: int setftime(int handle, struct ftime *ftimep); 程序例:
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int main(void) { struct ftime filet; FILE *fp;
if ((fp = fopen("TEST.$$$", "w")) == NULL) { perror("Error:"); exit(1); }
fprintf(fp, "testing...\n");
/* load ftime structure with new time and date */ filet.ft_tsec = 1; filet.ft_min = 1; filet.ft_hour = 1; filet.ft_day = 1; filet.ft_month = 1; filet.ft_year = 21;
/* show current directory for time and date */ system("dir TEST.$$$");
/* change the time and date stamp*/ setftime(fileno(fp), &filet);
/* close and remove the temporary file */ fclose(fp);
system("dir TEST.$$$");
unlink("TEST.$$$"); return 0; }
函数名: setgraphbufsize 功 能: 改变内部图形缓冲区的大小 用 法: unsigned far setgraphbufsize(unsigned bufsize); 程序例:
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#define BUFSIZE 1000 /* internal graphics buffer size */
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y, oldsize; char msg[80];
/* set the size of the internal graphics buffer */ /* before making a call to initgraph. */ oldsize = setgraphbufsize(BUFSIZE);
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
x = getmaxx() / 2; y = getmaxy() / 2;
/* output some messages */ sprintf(msg, "Graphics buffer size: %d", BUFSIZE); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, msg); sprintf(msg, "Old graphics buffer size: %d", oldsize); outtextxy(x, y+textheight("W"), msg);
/* clean up */ getch(); closegraph(); return 0; }
函数名: setgraphmode 功 能: 将系统设置成图形模式且清屏 用 法: void far setgraphmode(int mode); 程序例: ＃i nclude ＃i nclude ＃i nclude ＃i nclude
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y;
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
x = getmaxx() / 2; y = getmaxy() / 2;
/* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "Press any key to exit graphics:"); getch();
/* restore system to text mode */ restorecrtmode(); printf("We're now in text mode.\n"); printf("Press any key to return to graphics mode:"); getch();
/* return to graphics mode */ setgraphmode(getgraphmode());
/* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "We're back in graphics mode."); outtextxy(x, y+textheight("W"), "Press any key to halt:");
/* clean up */ getch(); closegraph(); return 0; }
函数名: setjmp 功 能: 非局部转移 用 法: int setjmp(jmp_buf env); 程序例:
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void subroutine(void);
jmp_buf jumper;
int main(void) { int value;
value = setjmp(jumper); if (value != 0) { printf("Longjmp with value %d\n", value); exit(value); } printf("About to call subroutine ... \n"); subroutine(); return 0; }
void subroutine(void) { longjmp(jumper,1); }
函数名: setlinestyle 功 能: 设置当前画线宽度和类型 用 法: void far setlinestyle(int linestype, unsigned upattern); 程序例:
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/* the names of the line styles supported */ char *lname[] = { "SOLID_LINE", "DOTTED_LINE", "CENTER_LINE", "DASHED_LINE", "USERBIT_LINE" };
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode;
int style, midx, midy, userpat; char stylestr[40];
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
midx = getmaxx() / 2; midy = getmaxy() / 2;
/* a user defined line pattern */ /* binary: "0000000000000001" */ userpat = 1;
for (style=SOLID_LINE; style<=USERBIT_LINE; style++) { /* select the line style */ setlinestyle(style, userpat, 1);
/* convert style into a string */ strcpy(stylestr, lname[style]);
/* draw a line */ line(0, 0, midx-10, midy);
/* draw a rectangle */ rectangle(0, 0, getmaxx(), getmaxy());
/* output a message */ outtextxy(midx, midy, stylestr);
/* wait for a key */ getch(); cleardevice(); }
/* clean up */ closegraph(); return 0; }
函数名: setmem 功 能: 存值到存储区 用 法: void setmem(void *addr, int len, char value); 程序例:
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int main(void) { char *dest;
dest = calloc(21, sizeof(char)); setmem(dest, 20, 'c'); printf("%s\n", dest);
return 0; }
函数名: setmode 功 能: 设置打开文件方式 用 法: int setmode(int handle, unsigned mode); 程序例:
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int main(void) { int result;
result = setmode(fileno(stdprn), O_TEXT); if (result == -1) perror("Mode not available\n"); else printf("Mode successfully switched\n"); return 0; }
函数名: setpalette 功 能: 改变调色板的颜色 用 法: void far setpalette(int index, int actural_color); 程序例:
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int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int color, maxcolor, ht; int y = 10; char msg[80];
/* initialize graphics and local variables */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ }
maxcolor = getmaxcolor(); ht = 2 * textheight("W");
/* display the default colors */ for (color=1; color<=maxcolor; color++) { setcolor(color); sprintf(msg, "Color: %d", color); outtextxy(1, y, msg); y += ht; }
/* wait for a key */ getch();
/* black out the colors one by one */ for (color=1; color<=maxcolor; color++) { setpalette(color, BLACK); getch(); }
/* clean up */ closegraph(); return 0; }