When you open a DLL file in a text editor, you see a bunch of what looks like crap, but it's actually the functions or your progam under text format. Try something like this and compare it with any DLL on your computer :
Code:
// PROGRAM whatsadll.cpp
// COMPILED AS whatsadll.exe
#include <fstream.h>
#include <iostream.h>
#include <conio.c> // For getch();
ifstream fin;
ofstream fout;
char content;
int main()
{
fin.open("whatsadll.exe", ios::in); // Open your own program
fout.open("whatsadll.dll", ios::out); // Create a dll file for your program
while(fin.get(content))
{
cout << content;
fout << content;
} /* Grab all data under text form from your program and write it to screen and to a file. */
fin.close();
fout.close();
// Don't forget to close your files.
cout << "\n\nProgram executed.";
char a = getch(); /* To enable a pause to read what's on screen until someone hits a button */
return 0;
}
Chances are, what's on screen will not look what's in the file, because you'll have things like \a which will cause a beep when running but will not be written on screen, but will be in the file. Otherwise, they look the same.
My result :
Code:
MZ @ !L!This program cannot be run in DOS mode.
$ PE L /= \ 8 F X ` @
` .text D F ` `.data P `
J @ .bss 0 p .idata `
T @
UEPPcA PEPh`A h `A E Z
]ÉUPPTcA tY A $A uQt"TcA Q
QRP $ $A t TcA Q@QRP
$ ]Ít& TcA QQRP $ $A
뎐& ' UVS1E1ۋ = = sE=
t e[^] PPj j ] ttރ
j ЃPPjj 7 PPj j% t t
jPPjj u = t=
tnt& USh@ R}
`A `A QRP z $J & ' UjA 1]Ð UjA
]g& UEPE EPh `A
f `A Pj P
EPE EPh j j P
jjo ÉU8EPj]
Pj EfEEfEEPEPEU)Pj
j P# EPEP
ÐU8EPj P Ef
EEfEEPEPEUPj j
P E֍PREԍPRo U帄
7 S MIfȋM Iى% ȋMIfʋMIى ʉEUEPDž PDž fDžP
fDž P_Pj P
h@ EP E E EU )
9E~YE EU)9E~9EUЋU
э ]ىڍ_
EEE뛍v EU xU
EHfEE HfEEPj P
ÐU帄 _ Sh@ j _P
MIfȋM Iى% ȋMIfʋMIى
ʉEUE
E EU )9E~ E EU)
9EEUЀ8 u fE Mʉ
ȍ_M]ي E Mʉȍf
EE|EXEPDž PDž fDžP fDž P_PjP P}
xÉUEEEPj
PP Ív UEPj P-
UE`A Ef `A Pj
P ÉUE `A `A
UPjr P ÉU
(EPjI PV UBÉ
U(EPj P" UBwhatsadll.exe whatsadll.dll
Program executed. U$S h jh:@ h pA
5 h jhH@ hpA !5 hpA hPpA
ËP# u7v pA Ph0`A _ pA PhpA G 랉h pA
hpA
hV@ h0`A E11 ]U
} uQ} t'jh pA
jhpA %jhpA jh
pA 3ios PsA `7ostream 7istream 11fstreambase sA @@sA P @8ifstream sA @`sA P
@8ofstream 11_ios_fields Uh jÉUh j ÉU WVSǝ
\} tJEPU@ PeA @@ BP @ @ f@ @ @ @ \AEE
Em@@ `EAU@ cA } u1}
cA UP M)cA f
EȃUXR* \AE_E E
m@@ `E_AUXu@
@ @ @ @ f@ @ @ @ \A A AEu\B`Džd
h_h@H @ ``J} t
You can read pieces of intelligent things in there by looking carefully 
The beginning says "This program cannot be run in DOS mode.", the end has "ifstream" and "ostream" in them...
What is the purpose of a DLL?
