g_open、g_print、g_free等C语言函数大全中所有以g开头的函数，你能全部列举出来吗？

本文共计3616个文字，预计阅读时间需要15分钟。

C语言函数大全——g开头函数（下）

17. getmodename

17.1 函数说明

17.2 函数声明

char *getmodename(int mode_name);

17.3 函数功能获取指定模式的名称。

C语言函数大全

本篇介绍C语言函数大全--g开头的函数（下）

17. getmodename

17.1 函数说明

函数声明 函数功能 char * getmodename(int mode_name); 获取指定的图形模式名

17.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main(void) { int gdriver = DETECT, gmode, errorcode; int midx, midy, mode; char numname[80], modename[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; mode = getgraphmode(); sprintf(numname, "%d is the current mode number.", mode); sprintf(modename, "%s is the current graphics mode.", getmodename(mode)); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, numname); outtextxy(midx, midy+2*textheight("W"), modename); getch(); closegraph(); return 0; }

17.3 运行结果

18. getmoderange

18.1 函数说明

函数声明 函数功能 void getmoderange(int graphdriver, int *lomode, int *himode); 获取给定图形驱动程序的模式范围

18.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; int midx, midy, low, high; char mrange[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; getmoderange(gdriver, &low, &high); sprintf(mrange, "This driver supports modes %d~%d", low, high); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, mrange); getch(); closegraph(); return 0; }

18.3 运行结果

19. getpalette

19.1 函数说明

函数声明 函数功能 void getpalette(struct palettetype *palette); 获取有关当前调色板的信息

19.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; struct palettetype pal; char psize[80], pval[20]; int i, ht; int y = 10; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } getpalette(&pal); sprintf(psize, "The palette has %d modifiable entries.", pal.size); outtextxy(0, y, psize); if (pal.size != 0) { ht = textheight("W"); y += 2*ht; outtextxy(0, y, "Here are the current values:"); y += 2*ht; for (i=0; i < pal.size; i++, y+=ht) { sprintf(pval, "palette[%02d]: 0x%02X", i, pal.colors[i]); outtextxy(0, y, pval); } } getch(); closegraph(); return 0; }

19.3 运行结果

20. getpixel

20.1 函数说明

函数声明 函数功能 int getpixel(int x, int y); 获取得指定像素的颜色

20.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <time.h> #define PIXEL_COUNT 1000 #define DELAY_TIME 100 int main(void) { int gdriver = DETECT, gmode, errorcode; int midx, midy, x, y, color, maxx, maxy, maxcolor; char mPixel[50]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; maxx = getmaxx() + 1; maxy = getmaxy() + 1; maxcolor = getmaxcolor() + 1; while (!kbhit()) { srand((unsigned)time(NULL)); x = rand() % maxx; y = rand() % maxy; color = rand() % maxcolor; putpixel(x, y, color); sprintf(mPixel, "color of pixel at (%d,%d) = %d", x, y, getpixel(x, y)); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, mPixel); delay(DELAY_TIME); cleardevice(); } getch(); closegraph(); return 0; }

20.3 运行结果

21. gets

21.1 函数说明

函数声明 函数功能 从标准输入流中读取字符串，直至遇到到换行符或EOF时停止，并将读取的结果存放在 buffer 指针所指向的字符数组中。换行符不作为读取串的内容，读取的换行符被转换为 '\0' 空字符，并由此来结束字符串。

注意： gets 函数可以无限读取，易发生溢出。如果溢出，多出来的字符将被写入到堆栈中，这就覆盖了堆栈原先的内容，破坏一个或多个不相关变量的值。

21.2 演示示例

#include <stdio.h> int main() { char string[80]; printf("Input a string:"); gets(string); printf("The string input was: %s\n", string); return 0; }

21.3 运行结果

22. gettextsettings

22.1 函数说明

函数声明 函数功能 void gettextsettings(struct textsettingstype *textinfo); 获取有关当前图形文本字体的信息

22.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> // 文本字体 char *font[] = { "DEFAULT_FONT", "TRIPLEX_FONT", "SMALL_FONT", "SANS_SERIF_FONT", "GOTHIC_FONT" }; // 文本方向 char *dir[] = { "HORIZ_DIR", "VERT_DIR" }; // 文本水平对齐方式 char *hjust[] = { "LEFT_TEXT", "CENTER_TEXT", "RIGHT_TEXT" }; // 文本垂直对齐方式 char *vjust[] = { "BOTTOM_TEXT", "CENTER_TEXT", "TOP_TEXT" }; int main() { int gdriver = DETECT, gmode, errorcode; struct textsettingstype textinfo; int midx, midy, ht; char fontstr[80], dirstr[80], sizestr[80]; char hjuststr[80], vjuststr[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; // 获取有关当前图形文本字体的信息 gettextsettings(&textinfo); sprintf(fontstr, "%s is the text style.", font[textinfo.font]); sprintf(dirstr, "%s is the text direction.", dir[textinfo.direction]); sprintf(sizestr, "%d is the text size.", textinfo.charsize); sprintf(hjuststr, "%s is the horizontal justification.", hjust[textinfo.horiz]); sprintf(vjuststr, "%s is the vertical justification.", vjust[textinfo.vert]); ht = textheight("W"); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, fontstr); outtextxy(midx, midy+2*ht, dirstr); outtextxy(midx, midy+4*ht, sizestr); outtextxy(midx, midy+6*ht, hjuststr); outtextxy(midx, midy+8*ht, vjuststr); getch(); closegraph(); return 0; }

22.3 运行结果

23. getviewsettings

23.1 函数说明

函数声明 函数功能 void getviewsettings(struct viewporttype *viewport); 获取有关当前视区的信息

23.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> char *clip[] = { "OFF", "ON" }; int main() { int gdriver = DETECT, gmode, errorcode; struct viewporttype viewinfo; int midx, midy, ht; char topstr[80], botstr[80], clipstr[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; // 获取有关当前视区的信息 getviewsettings(&viewinfo); sprintf(topstr, "(%d, %d) is the upper left viewport corner.", viewinfo.left, viewinfo.top); sprintf(botstr, "(%d, %d) is the lower right viewport corner.", viewinfo.right, viewinfo.bottom); sprintf(clipstr, "Clipping is turned %s.", clip[viewinfo.clip]); settextjustify(CENTER_TEXT, CENTER_TEXT); ht = textheight("W"); outtextxy(midx, midy, topstr); outtextxy(midx, midy+2*ht, botstr); outtextxy(midx, midy+4*ht, clipstr); getch(); closegraph(); return 0; }

23.3 运行结果

24. getw

24.1 函数说明

函数声明 函数功能 int getw(FILE *strem); 从 stream 所指向文件读取下一个整数

24.2 演示示例

#include <stdio.h> #include <stdlib.h> #define FNAME "test.txt" int main(void) { FILE *fp; int word; fp = fopen(FNAME, "wb"); if (fp == NULL) { printf("Error opening file %s\n", FNAME); exit(1); } word = 94; putw(word,fp); if (ferror(fp)) printf("Error writing to file\n"); else printf("Successful write\n"); fclose(fp); fp = fopen(FNAME, "rb"); if (fp == NULL) { printf("Error opening file %s\n", FNAME); exit(1); } word = getw(fp); if (ferror(fp)) printf("Error reading file\n"); else printf("Successful read: word = %d\n", word); fclose(fp); unlink(FNAME); return 0; }

24.3 运行结果

25. getx，gety

25.1 函数说明

函数声明 函数功能 int getx(void); 获取当前图形位置的 x 坐标 获取当前图形位置的 y 坐标

25.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main(void) { int gdriver = DETECT, gmode, errorcode; char msg[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } moveto(getmaxx() / 2, getmaxy() / 2); sprintf(msg, "<-(%d, %d) is the here.", getx(), gety()); outtext(msg); getch(); closegraph(); return 0; }

25.3 运行结果

26. gmtime

26.1 函数说明

函数声明 函数功能 struct tm *gmtime(long *clock); 把日期和时间转换为格林尼治标准时间(GMT)

26.2 演示示例

#include <stdio.h> #include <stdlib.h> #include <time.h> #include <dos.h> // 太平洋标准时间和夏令时 char *tzstr = "TZ=PST8PDT"; int main(void) { time_t t; struct tm *gmt, *area; putenv(tzstr); // 用来改变或增加环境变量的内容 tzset(); // UNIX时间兼容函数 // 获取当前的系统时间，其值表示从协调世界时（Coordinated Universal Time） // 1970年1月1日00:00:00（称为UNIX系统的Epoch时间）到当前时刻的秒数。 t = time(NULL); area = localtime(&t); // 把从1970-1-1零点零分到当前时间系统所偏移的秒数时间转换为本地时间 // asctime 把timeptr指向的tm结构体中储存的时间转换为字符串 printf("Local time is: %s", asctime(area)); // 把日期和时间转换为格林尼治标准时间(GMT) gmt = gmtime(&t); printf("GMT is: %s", asctime(gmt)); return 0; }

26.3 运行结果

27. graphdefaults

27.1 函数说明

函数声明 函数功能 void graphdefaults(void); 将所有图形设置复位为它们的缺省值

27.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { int gdriver = DETECT, gmode, errorcode; int maxx, maxy; initgraph(&gdriver, &gmode, "c:\\bor\\Borland\\bgi"); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } maxx = getmaxx(); maxy = getmaxy(); setlinestyle(DOTTED_LINE, 0, 3); line(0, 0, maxx, maxy); outtextxy(maxx/2, maxy/3, "Before default values are restored."); getch(); // 将所有图形设置复位为它们的缺省值 graphdefaults(); cleardevice(); line(0, 0, maxx, maxy); outtextxy(maxx/2, maxy/3, "After restoring default values."); getch(); closegraph(); return 0; }

27.3 运行结果

28. grapherrormsg

28.1 函数说明

函数声明 函数功能 char * grapherrormsg(int errorcode); 返回一个错误信息串的指针

28.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> #define NONSENSE -50 int main(void) { // FORCE AN ERROR TO OCCUR int gdriver = NONSENSE, gmode, errorcode; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } line(0, 0, getmaxx(), getmaxy()); getch(); closegraph(); return 0; }

28.3 运行结果

29. graphresult

29.1 函数说明

函数声明 函数功能 int graphresult(void); 返回最后一次不成功的图形操作的错误代码

29.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { // request auto detection int gdriver = DETECT, gmode, errorcode; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } line(0, 0, getmaxx(), getmaxy()); getch(); closegraph(); return 0; }

29.3 运行结果

30. getmaxwidth，getmaxheight

30.1 函数说明

函数声明 函数功能 int getmaxwidth(void); 获取屏幕的最大宽度 int getmaxheight(void); 获取屏幕的最大高度

30.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; int midx, midy; char ch[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; sprintf(ch, "maxwidth = %d, maxheight = %d", getmaxwidth(), getmaxheight()); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, ch); getch(); closegraph(); return 0; }

30.3 运行结果

31. getdisplaycolor

31.1 函数说明

函数声明 函数功能 int getdisplaycolor( int color ); 根据 color ，返回要显示的颜色值

注意： color = -1 , 则返回 WHITE = 15 的颜色值；color < - 1 或 color > 15，则输出一个8位整数。

31.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; int midx, midy; char ch[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; sprintf(ch, "color = %d, displaycolor(-1) = %d, displaycolor(16) = %d", getcolor(), getdisplaycolor(-1), getdisplaycolor(16)); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, ch); getch(); closegraph(); return 0; }

31.3 运行结果

32. getwindowwidth，getwindowheight

32.1 函数说明

函数声明 函数功能 int getwindowwidth(); 获取图形界面窗口宽度 int getwindowheight(void); 获取图形界面窗口高度

32.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; int midx, midy, low, high; char ch[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; sprintf(ch, "windowwidth = %d, windowheight = %d", getwindowwidth(), getwindowheight()); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, ch); getch(); closegraph(); return 0; }

32.3 运行结果

33. getrefreshingbgi

33.1 函数说明

函数声明 函数功能 bool getrefreshingbgi(void); 获取刷新基础图形界面标识

33.2 演示示例

#include <graphics.h> #include <stdlib.h> #include <stdio.h> int main() { int gdriver = DETECT, gmode, errorcode; int midx, midy, low, high; char ch[80]; initgraph(&gdriver, &gmode, ""); errorcode = graphresult(); if (errorcode != grOk) { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); } midx = getmaxx() / 2; midy = getmaxy() / 2; sprintf(ch, "refreshingbgi = %d", getrefreshingbgi()); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(midx, midy, ch); getch(); closegraph(); return 0; }

33.3 运行结果

参考

1. [API Reference Document]
2. [gets]