获得字符宽度的问题?

fhw217 2016-02-21 04:12:23
我现在正在做一个纯文本编辑器，要实现自动折行功能，我用的是CDC::GetCharWidth逐个字符获得宽度，如果超过右边界就折行，打开2M的文本文件时，用时是10秒左右，而用Windows自带的写字板只需要1秒，UltraEdit和VS2010也只需要1秒，请问有没有更快的函数或好的算法？
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赵4老师 2016-02-22
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仅处理可见部分？
笨笨仔 2016-02-21
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引用 楼主 fhw_bin_dl 的回复:
我现在正在做一个纯文本编辑器，要实现自动折行功能，我用的是CDC::GetCharWidth逐个字符获得宽度，如果超过右边界就折行，打开2M的文本文件时，用时是10秒左右，而用Windows自带的写字板只需要1秒，UltraEdit和VS2010也只需要1秒，请问有没有更快的函数或好的算法？
你使用实测方式计算肯定会慢，使用（字宽+间隔）*字数的方式估计会快点。
schlafenhamster 2016-02-21
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使用线程"打开2M的文本文件"
dustpg 2016-02-21
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DirectWrite接口，直接由有文本布局。 微软自己写的Windows接口，性能应该不错，自己还没做压力测试。
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data-v-ca2d15ac>转载：http://likang.me/blog/2012/04/13/calculate-character-width-in-python/最近在用python写一个CLI小程序，其中涉及到计算<em>字符</em><em>宽度</em>，目标是以友好的方式将一个长<em>字符</em>串截取为等宽的片段。对于unicode<em>字符</em>，python的len函数可以准确的计算其中所包含的<em>字符</em>个数，但是个数并不代表<em>宽度</em>，如：>>>len(...</a></div><div data-report-view="{"mod":"popu_645","index":"5","dest":"https://blog.csdn.net/majianfeng9263/article/details/107175484","strategy":"2~default~OPENSEARCH~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default\",\"dist_request_id\":\"1752541351826_13241\"}","spm":"1035.2023.3001.6557"}" class="list-item" data-v-ca2d15ac><div class="recommend-title" data-v-ca2d15ac><img 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data-report-click="{"mod":"popu_645","index":"5","dest":"https://blog.csdn.net/majianfeng9263/article/details/107175484","strategy":"2~default~OPENSEARCH~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default\",\"dist_request_id\":\"1752541351826_13241\"}","spm":"1035.2023.3001.6557"}" data-report-query="spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default&depth_1-utm_source=distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default" class="title" data-v-ca2d15ac>Lua计算<em>字符</em>串<em>宽度</em></a></div> <a target="_blank" href="https://blog.csdn.net/majianfeng9263/article/details/107175484" data-report-click="{"mod":"popu_645","index":"5","dest":"https://blog.csdn.net/majianfeng9263/article/details/107175484","strategy":"2~default~OPENSEARCH~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default\",\"dist_request_id\":\"1752541351826_13241\"}","spm":"1035.2023.3001.6557"}" data-report-query="spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default&depth_1-utm_source=distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-107175484-bbs-391905121.264^v3^pc_relevant_bbs_down_v2_default" class="desc" data-v-ca2d15ac>一、判断<em>字符</em>串中包含中文<em>字符</em>的方法 遍历数组，对每个字节使用string.byte()，发现有大于127的，就是汉字，可以参照下面的代码。 二、计算<em>字符</em>串<em>宽度</em>函数 复制代码代码如下: – 计算<em>字符</em>串<em>宽度</em> local str = “Jimmy: 你好,世界!” local fontSize = 20 local lenInByte = #str local width = 0 for i=1,lenInByte do local curByte = string.byte(str, i) local byte</a></div></div></div></div> <div class="public_pc_right_footer2020" style="display:none;" data-v-4a5a7f56></div></div> <div id="right-floor-user-content_562" data-editor="{"type":"floor","pageId":143,"floorId":562}" class="user-right-floor right-box main-box detail-user-right" data-v-229a00b0><div class="__vuescroll" style="height:100%;width:100%;padding:0;position:relative;overflow:hidden;"><div class="__panel __hidebar" style="position:relative;box-sizing:border-box;height:100%;overflow-y:hidden;overflow-x:hidden;transform-origin:;transform:;"><div class="__view" style="position:relative;box-sizing:border-box;min-width:100%;min-height:100%;"><!----><div comp-data="[object Object]" baseInfo="[object Object]" community="[object Object]" class="introduce" data-v-4722a3ae><div class="introduce-title" data-v-4722a3ae><div class="img-info" data-v-4722a3ae><a 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box中我曾经说过，\u003Cem\u003E字符\u003C\u002Fem\u003E字体是没办法直接设置width的。 \n不过我们还有其他方法来控制\u003Cem\u003E字符\u003C\u002Fem\u003E字体的\u003Cem\u003E宽度\u003C\u002Fem\u003E。单个\u003Cem\u003E字符\u003C\u002Fem\u003E字体的\u003Cem\u003E宽度\u003C\u002Fem\u003E\n 单个\u003Cem\u003E字符\u003C\u002Fem\u003E字体的\u003Cem\u003E宽度\u003C\u002Fem\u003E只受font-size属性影响。\nfont-size\u003C!DOCTYPE html\u003E\n\u003Chtml lang=\"en\"\u003E\n\u003Chead\u003E\n \u003Cmeta charset=\"UTF-8\"\u003E\n \u003Ctitle\u003E单个\u003Cem\u003E字符\u003C\u002Fem\u003E字体的\u003Cem\u003E宽度\u003C\u002Fem\u003E","createTime":"2017-09-09 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计算\u003Cem\u003E字符\u003C\u002Fem\u003E串\u003Cem\u003E宽度\u003C\u002Fem\u003E\nlocal str = “Jimmy: 你好,世界!”\nlocal fontSize = 20\nlocal lenInByte = #str\nlocal width = 0\nfor i=1,lenInByte do\nlocal curByte = string.byte(str, i)\nlocal byte","createTime":"2020-07-07 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