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Can VScode edit DLL library files?

Dec 14, 2019 am 11:49 AM
dllvscodeLibrary fileedit

Can VScode edit DLL library files?

我们平时在工作中经常会遇到一些已经被编译后的DLL,而且更加麻烦的是没有源代码可以进行修改,只能针对这个DLL的文件进行修改才能得到我们想要的结果。

本文将通过一个实例来演示:如何完成一个简单的修改。

我们将会用到以下几种工具;

1、微软的工具ildasm.exe:这个是把DLL生成IL文件的一个软件,是微软自带了;可以在C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin找到该软件;

2、微软的工具ilasm.exe:这个是把IL文件重新生成DLL的功能,可以在C:\Windows\Microsoft.NET\Framework\v4.0.30319找到该软件。

要使用ildasm.exe把DLL这个文件转化成IL文件

Can VScode edit DLL library files?

把dll文件转储为*.il文件存到某个指定文件夹里,得到Web.il和Web.res两个文件,有时也会有*.resource文件

Can VScode edit DLL library files?

我们可以打开Web.il文件,里面有DLL生成的IL内容,我们很容易就可以定位到想要的这个方法,只要让它固定返回true就可以修改成功,方法内的IL代码就是我们要修改的内容,修改GetLicense()方法内的IL代码,让它固定返回true。

下面这个IL就是让它返回为true;修改完接着保存IL文件;

Can VScode edit DLL library files?

当修改完IL文件后要把它转化成DLL文件,打开DOC命令输入进入到*.il的文件夹,然后输入命令:

c:\windows\microsoft.net\framework\v4.0.30319\ilasm.exe
 /dll/resource=Web.res Web.il

1:要进入IL文件的文件夹 

2:其中"/dll/"这个前面要有一个空格 

3:.res文件要在.il文件前面,中间要有个空格

运行完上面的命令后会生成一个新DLL文件,然后把它复制到我们的站点下面:

Can VScode edit DLL library files?

运行的结果:

Can VScode edit DLL library files?

完成上面的步骤就可以成功修改DLL文件,当然本实例只是一个简单的修改,若要进行比较复杂修改IL代码则要对IL知识有个相当的了解。

注意 .il文件  每行开头的IL_0000  是相当于一个内存地址,如果改动涉及到增删行数的时候  需要注意修改内存地址,如果不方便精确计算,可把修改处后面的地址整体增加整百整千 如IL_333a改成IL_433a。

下面是一个可能会经常要用到的IL返回true跟false的代码;

    .maxstack 1
    .locals init (
        [0] bool CS$1$0000)
    L_0000: nop 
    L_0001: ldc.i4.1 
    L_0002: stloc.0 
    L_0003: br.s L_0005
    L_0005: ldloc.0 
    L_0006: ret 

return true; 

    // 代码大小       7 (0x7)
    .maxstack  1
    .locals init ([0] bool CS$1$0000)
    IL_0000:  nop
    IL_0001:  ldc.i4.0
    IL_0002:  stloc.0
    IL_0003:  br.s       IL_0005

    IL_0005:  ldloc.0
    IL_0006:  ret 

return false;

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