《Linux程序设计权威指南》源代码

									/* File: font.c */									#include 					#include 					#include 					#include 									#include 													void draw(Display *display,  Window win, GC gc, 						XFontStruct *fs, XFontStruct *fs16)					{						char *str1 = "Hello World!";						char *str2 = "你好，大家好！";																//参考线						XDrawLine(display, win, gc, 20, 100, 300, 100);						//画字符串						XSetFont(display, gc, fs->fid);						XDrawString(display, win, gc, 20, 100, str1, strlen(str1));						//计算宽度						printf("str1 width:%d\n", XTextWidth(fs, str1, strlen(str1)));												//画中文字符串						XSetFont(display, gc, fs16->fid);						XDrawString16(display, win, gc, 200, 100, (XChar2b*)str2, 							strlen(str2)/2);						//计算宽度						printf("str2 width:%d\n", XTextWidth16(fs16, 							(XChar2b *)str2, strlen(str2)));																	}									int main(int argc, char **argv)					{						int i;						Display *display;						int screen_num;						Window win;			//窗口ID						unsigned int width, height;	//窗口尺寸						unsigned int border_width = 4;	//边界空白						unsigned int display_width, display_height;//屏幕尺寸						int count;						XEvent report;						GC gc;						unsigned long valuemask = 0;						XGCValues values;						char *display_name = NULL;						char **fonts;						int font_count;						XFontStruct *fs, *fs16;											// 和X 服务器连接						if ( (display=XOpenDisplay(display_name)) == NULL )						{							printf("Cannot connect to X server %s\n", 									XDisplayName(display_name));							exit(-1);						}										//获得缺省的 screen_num						screen_num = DefaultScreen(display);										//获得屏幕的宽度和高度						display_width = DisplayWidth(display, screen_num);						display_height = DisplayHeight(display, screen_num);											//指定所建立窗口的宽度和高度						//width = display_width/2;						//height = display_height/2;						width = 600;						height = 400;										//列出所有字体						printf("All fonts on this server:\n");						fonts = XListFonts(display, "*", 10000, &font_count);						for(i=0; i							printf("%s\n", fonts[i]);						XFreeFontNames(fonts);										//列出所有G						printf("All gb2312 fonts on this server:\n");						fonts = XListFonts(display, "*gb2312*", 10000, &font_count);						for(i=0; i							printf("%s\n", fonts[i]);						XFreeFontNames(fonts);										//载入8x16字体						if((fs = XLoadQueryFont(display, "9x15")) == NULL){							printf("Cannot load font 9x15\n");							exit(1);						}						//载入中文16点阵字体						if((fs16 = XLoadQueryFont(display, "ccs16_1")) == NULL){							printf("Cannot load Chinese font\n");							exit(1);						}										//建立窗口						win = XCreateSimpleWindow(display, 	//display							RootWindow(display,screen_num), //父窗口							0, 0, width, height, 		//位置和大小							border_width, 			//边界宽度							BlackPixel(display,screen_num), //前景色							WhitePixel(display,screen_num));//背景色											//选择窗口感兴趣的事件掩码						XSelectInput(display, win, 							ExposureMask | KeyPressMask | 							ButtonPressMask | StructureNotifyMask);										//建立GC						gc = XCreateGC(display, win, valuemask, &values);										//显示窗口						XMapWindow(display, win);										//进入事件循环						while (1)  {											//取得队列中的事件							XNextEvent(display, &report);							switch  (report.type) {											//曝光事件, 窗口应重绘							case Expose:								//取得最后一个曝光事件								if (report.xexpose.count != 0) break;								draw(display, win, gc, fs, fs16);								break;											//窗口尺寸改变, 重新取得窗口的宽度和高度							case ConfigureNotify:								width = report.xconfigure.width;								height = report.xconfigure.height;								break;											//鼠标点击或有按键, 释放资源则退出							case ButtonPress:							case KeyPress:								XFreeGC(display, gc);								XCloseDisplay(display);								exit(1);							default:																break;							}						}					}