Invoking a dll function without a call in the main

Question

I want to know how can we call a function that is defined in external static class (dll file) without a call to it in main.

To make things clearer, consider an exe file of which code is not exposed and we cannot do any sort of modifications to it, now I want to test a exe file with certain test cases that are defined in my dll file for which a call to the function must me made within the main() function of the exe file. But as mentioned, I dont have permission to modify the code of exe file. Now how this dll function is invoked at the required pointof execution without a call to it using visual studio.

I want to call a function without adding any line to main function.

To make things clearer ,I just want to add some example

static class DllClass
{
   static void dllFunction()
   {
      //some implementation.
   }
}
class ThirdParty
{
  public static void Main()
  {
    //Default implementation that i cannot modify.
    //Invoking my static function at this point without calling.(i.e i cannot call DllClass.dllFunction()) 
    //continuing with default implementation.
  }
}

It's really unclear what you're asking. Can you show some code examples, or maybe a diagram? — rory.ap, Aug 28 '17 at 11:24
So you want to call a dll from an exe without having the access to modify the exe? — Richard Boyce, Aug 28 '17 at 11:42
@Richard Boyce YEAH ! to some extent i want to call a function in dll from an exe without modifying main in the exe file (in visual studio ) — GANESH GANI, Aug 28 '17 at 12:02
@dymanoid yes indeed it is kind of injecting some code in main — GANESH GANI, Aug 28 '17 at 12:25
@GANESH GANI, How about using the Powershell in your side as a workaround? — Jack Zhai, Sep 01 '17 at 09:52

score 0 · Answer 1 · answered Aug 29 '17 at 06:24

One idea is that using the Powershell call the dll file if you couldn't modify the code in the .exe.

For example, a simple library with methods.

namespace Math
{
public class Methods
{
public Methods()
{
}
public static int Compare1(int a, int b)
{
if (a return a;
else
return b;
}

public int Compare2(int a, int b)
{
if (a return a;
else
return b;
}
}
}

And then call it in the Powershell Environment:

[void][reflection.assembly]::LoadFile("C:/xxx.dll")
02.[Math.methods]::Compare1(10,8)
03.$a=New-Object Math.Methods
04.$a.Compare2(2,6)

Invoking a dll function without a call in the main

1 Answers1