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POIs this a new method to get address of any function member?
 

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  1. POIs this a new method to get address of any function member?
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    <p><strong>"Member function"</strong> is the most stubborn thing. Simply I cannot convert them into <code>*void</code> values. I've done some methods which can solve this; however, the only thing I annoyed: I have to create a new definition for every set of argument types. So the fastest method to achieve the goal :</p> <pre><code>struct FOO{ void ONE_PARAM(int){} void TWO_PARAM(int, int){} void THREE_PARAM(int, int, int){} void FOUR_PARAM(int, int, int, int){} }; </code></pre> <p>Firstly, calling a structure function member by assembly :</p> <pre><code>__asm mov ecx, ADDRESS_OF_STRUCTURE __asm push //parameters __asm call ADDRESS_OF_MEMBER_FUNCTION </code></pre> <p><strong>Longest : Template...</strong></p> <pre><code>template &lt;class F,void (F::*Function)(int)&gt; //Note : Only for FOO::ONE_PARAM void * GetFunctionAddress() { union ADDRESS { void (F::*func)(int); void * function_address; }address_data; address_data.func = Function; return address_data.function_address; } </code></pre> <p><strong>Shorter method : Define a function pointer to member function</strong></p> <pre><code>void *function_address; /////////////////////////////////////////////// void(FOO::*address_ONE_PARAM)(int) = FOO::ONE_PARAM; void(FOO::*address_TWO_PARAM)(int, int) = FOO::TWO_PARAM; void(FOO::*address_THREE_PARAM)(int, int, int) = FOO::THREE_PARAM; void(FOO::*address_FOUR_PARAM)(int, int, int, int) = FOO::FOUR_PARAM; __asm mov eax, address_ONE_PARAM //OK __asm mov function_address, eax __asm mov eax, address_TWO_PARAM //OK __asm mov function_address, eax __asm mov eax, address_THREE_PARAM //OK __asm mov function_address, eax __asm mov eax, address_FOUR_PARAM //OK __asm mov function_address, eax </code></pre> <p>But it's still too long.</p> <p><strong>The most convenient method</strong> : Using directly standard function : <strong>sprintf</strong></p> <p>I discovered <strong>__thiscall</strong> functions also can be pushed as <strong>"..." parameters</strong> and I have checked it carefully by function <strong>printf</strong>. It is simple, and you don't need to define again its whole set of argument types to accept the pointer. And the code :</p> <pre><code>unsigned int address; char buffer[12]; /////////////////////////////////////////////// sprintf(buffer, "0x%X", FOO::ONE_PARAM); address = strtol(buffer,NULL,16); sprintf(buffer, "0x%X", FOO::TWO_PARAM); address = strtol(buffer,NULL,16); sprintf(buffer, "0x%X", FOO::THREE_PARAM); address = strtol(buffer,NULL,16); sprintf(buffer, "0x%X", FOO::FOUR_PARAM); address = strtol(buffer,NULL,16); </code></pre> <p>As you can see this method is much shorter and also it's very convenient. I don't need to insert assembly code, the code looks better but on the other hand, I am worrying about speed. Can the code be compressed more? Suppose two commands now it only requires a single command to work, is this possible?</p>
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    1. COBy "function member" do you mean "member function"?
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    2. COWhy do you need to convert the function address to void*?
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      1. USMichael Aaron Safyan
    3. COMember functions are not functions. (E.g. you cannot *call* a member function.) It is unreasonable to even *expect* that they should have an address in the classic sense.
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