自然语言计算器（opalcalc_1.81）一字节和谐教程

gagmeng

软件介绍：

• OpalCalc is a brand new type of calculator for the PC. As easy to use as Notepad or a word processor, OpalCalc allows you to insert natural language as part of the sum, along with multi-line support so you can go back and adjust your previous calculations. Want a tiny footprint on the screen for a single sum? Resize accordingly. Want it to fill the screen for heavy-duty work? OpalCalc can adapt.
• Featuring a lightweight footprint, on-the-fly calculation as you type, percentages, variable support, hundreds of units and functions, extensive notation support, intuitive design/documentation and much more. Once you've tried it, you'll never want to go back to your ordinary desktop (or PC) calculator again!
  

用户评价：

• PCWorld "Step Away From the Spreadsheet and Dig Donationware Gem OpalCalc"
• MakeUseOf.com: "OpalCalc: Cool Text-based Calculation App To Replace Your Windows Calc"
• LifeHacker: "Perform Long Calculations in Plain English with These Awesome Calculator Apps"
• Softoxi.com:"OpalCalc is a very convenient, reliable and effective calculator"
• FindMySoft.com "OpalCalc ? A Very Useful Calculator"
  

软件特性：

• Lightweight footprint (only 600k)
• Multiline support (notepad style)
• Configurable GUI with colour schemes
• Built-in 'Quickstart' tutorial
• Full colour coding
• Multiple undo/redo, zoom in/out, etc.
• Numerous built-in variables and functions (create your own too!)
• Percentage support
• Hundreds of measures, like kilograms and feet (create your own too)
• Extensive date and time support
• Currency support with conversion (data courtesy of themoneyconverter.com)
• Portable (260k from a pen drive!)
• Load/save/print support
• Programmer syntax and functions
• Custom number base support
• Advanced notation support
• Comma decimal point support for Europe, Russia, and South America etc.
  

软件界面：


和谐教程：
1、从官网说明可以了解到限制“The demo/'lite' version is fully functional, except for a 5 line limit for calculations. To overcome this limitation and help support the development of OpalCalc, upgrade using credit/debit card, or through Paypal (user license lasts forever, including updates, and there's no faffing about with keys or passwords).”


2、使用NET把编译工具(net reflector、ILSPY、justdecompile或者dnspy)加载OpalCalc.exe；
3、搜索字符串“5 lines”可定位到如下函数
public void createAnswers(string text)
{
...
   if (!this.determineWhetherToDisplayAnswer(this.demo, array, i, text))
        {
                this.answerWhole = "Demo allows only 5 lines";
                if (!this.demomsg)
                {
                        this.demomsg = true;
                        MessageBox.Show(Program.frm, "This demo/lite version of OpalCalc only allows 5 lines (excluding included tutorial and examples such as 'shopping' or 'workday'). You can still do a lot with that, but for unlimited lines, please upgrade via the website at: www.skytopia.com/software/opalcalc\n\n.....or select the red/square dropdown menu button and click 'Upgrade OpalCalc'. Paid users will often also receive a more up-to-date version of OpalCalc than demo users.");
                }
        }
...
}

从上面函数中可知道只要if (!this.determineWhetherToDisplayAnswer(this.demo, array, i, text))中为false即破解了限制，进入关键函数determineWhetherToDisplayAnswer；
private bool determineWhetherToDisplayAnswer(bool demo, string[] lines, int n, string text)
{
        return !demo || this.countNonSpaceLines(lines, n) < 5 || (text.Contains("OpalCalc QuickStart:") && text.Contains("Thank you for reading and enjoy OpalCalc! You may press F1 now, or reboot OpalCalc") && text.Contains("More complicated mathematical expressions are supported")) || (lines[n].Length >= 5 && (jtext.complexsums.Contains(lines[n]) || jtext.shopping.Contains(lines[n]) || jtext.workday.Contains(lines[n]) || jtext.shoppingandroom.Contains(lines[n]) || jtext.datesandtimes.Contains(lines[n])));
}

4、根据determineWhetherToDisplayAnswer函数可看出，只要demo输入为false即OK，因此可确定if (!this.determineWhetherToDisplayAnswer(this.demo, array, i, text))中this.demo必须为false；
5、分析对this.demo的引用，定位到
private void Form1_Load(object sender, EventArgs e)
{
...
   Program.debugStartup("calc complete", calc.debugToDisk);
   this.cc.demo = true;
   this.rtbi.SetRTBO(this.rtbo, this.cc);
...
}
只需修改为如下即可破解
private void Form1_Load(object sender, EventArgs e)
{
...
   Program.debugStartup("calc complete", calc.debugToDisk);
   this.cc.demo = false;
   this.rtbi.SetRTBO(this.rtbo, this.cc);
...
}

5、使用IDA或者dnspy查看this.cc.demo = false;这句语句的地址
/* 0x00012A92 17           */ IL_0056: ldc.i4.1
/* 0x00012A93 7D45000004   */ IL_0057: stfld     bool OpalCalc.calc::demo
6、使用winhex将地址0x00012A92修改为16即可
破解后效果展示：

和谐文件下载：（老话长谈，此文件仅供个人学习和交流，其它用途请购买正版。）
大家多给加点威望和PYB哦，你们的支持是我永远的动力！

游客，如果您要查看本帖隐藏内容请回复

cfc1680

支持一下了，感谢分享了

不苦小和尚

软件不错,试试看看

ZMLoveLH

软件的介绍全是英文，我这菜鸟看不懂啊，不过还是感谢楼主的分享

0xcb

支持了，顺便收了这个软件的代码，

冯玉姣

支持一下了，感谢分享了

dliwj

分析过程有用，感谢大牛分享

menglv

谢谢楼主分享

Dxer

谢谢表哥带来的net精彩破解。收藏了

jzw00101

谢谢老子分享