Need help with exporting functions in a dll
-Corellian
[244 byte] By [Corellian] at [2007-11-17 11:49:09] 
I have a dll that I want to load at run time. The problem is I don't know what functions it exports. Is there a way, at run time, I could load the dll, find out what functions it exports, and then call them? Thanks you,
-Corellian
# 1 Re: Need help with exporting functions in a dll
Hi ,u can use dumpbin.exe file which is available in VC98\bin directory to see the list of exported functions in the dll.
Rate if it helped u.
VCVCVC
VCVCVC at 2007-11-10 8:06:48 >
# 2 Re: Need help with exporting functions in a dll
Try to use LoadLibrary() and GetProcAddress() functions. Here is an example that hide your aplication ID. When you press Ctrl-Alt-Del your app. won't be listed there:typedef DWORD (WINAPI *HideCAD)(DWORD,DWORD);
void HideAplication(int state){
HMODULE kernel32dll;
HideCAD ourFunction;
kernel32dll=LoadLibrary("kernel32.dll");
ourFunction=(HideCAD)GetProcAddress(kernel32dll,"RegisterServiceProcess"); //the RegisterServiceProcess() function does our goal :))
if(state)
ourFunction(0,1);
else
ourFunction(0,0);
FreeLibrary(kernel32dll);
}
AndySoft at 2007-11-10 8:07:48 >
# 3 Re: Need help with exporting functions in a dll
Hi!U can use Dynamic Linking of the DLL i.e. u load the DLL at run BUT u hav to know the paramters of the functions and function names. U can get the exported function name from Dumpbin utlilty but u must know the function parametes. Here is an example.
int (*funptr) (void); // u hav to know the type of function i.e. the parameters and return type there is no utlility that can get u the parameters of the functions.
HINSTANCE hDll = LoadLibrary("mfc42.dll");
if(hDll != NULL)
AfxMessageBox("Got the Handle");
else
AfxMessageBox("No Handle");
funptr = (int (*) (void))GetProcAddress((HMODULE)hDll, "DllCanUnloadNow"); // if ur uncertain u can check the pointer to the function that u get back if its not null then u hav a valid pointer u can call the function then.
if(funptr != NULL)
funptr();
else
AfxMessageBox("Dont call the Function otherwise u will get into trouble :(");
Regards,
Rate it, if it Helps.
Regards,
Usman.
--
Good judgment is gained from experience. Experience is gained from bad judgment.
usman999_1 at 2007-11-10 8:08:48 >
# 4 Re: Need help with exporting functions in a dll
Hi!U can use Dynamic Linking of the DLL i.e. u load the DLL at run BUT u hav to know the paramters of the functions and function names. U can get the exported function name from Dumpbin utlilty but u must know the function parametes. Here is an example.
int (*funptr) (void); // u hav to know the type of function i.e. the parameters and return type there is no utlility that can get u the parameters of the functions.
HINSTANCE hDll = LoadLibrary("mfc42.dll");
if(hDll != NULL)
AfxMessageBox("Got the Handle");
else
AfxMessageBox("No Handle");
funptr = (int (*) (void))GetProcAddress((HMODULE)hDll, "DllCanUnloadNow"); // if ur uncertain u can check the pointer to the function that u get back if its not null then u hav a valid pointer u can call the function then.
if(funptr != NULL)
funptr();
else
AfxMessageBox("Dont call the Function otherwise u will get into trouble :(");
Regards,
Rate it, if it Helps.
Regards,
Usman.
--
Good judgment is gained from experience. Experience is gained from bad judgment.
usman999_1 at 2007-11-10 8:09:54 >
# 5 Re: Need help with exporting functions in a dll
Hi!U can use Dynamic Linking of the DLL i.e. u load the DLL at run BUT u hav to know the paramters of the functions and function names. U can get the exported function name from Dumpbin utlilty but u must know the function parametes. Here is an example.
int (*funptr) (void); // u hav to know the type of function i.e. the parameters and return type there is no utlility that can get u the parameters of the functions.
HINSTANCE hDll = LoadLibrary("mfc42.dll");
if(hDll != NULL)
AfxMessageBox("Got the Handle");
else
AfxMessageBox("No Handle");
funptr = (int (*) (void))GetProcAddress((HMODULE)hDll, "DllCanUnloadNow"); // if ur uncertain u can check the pointer to the function that u get back if its not null then u hav a valid pointer u can call the function then.
if(funptr != NULL)
funptr();
else
AfxMessageBox("Dont call the Function otherwise u will get into trouble :(");
Regards,
Rate it, if it Helps.
Regards,
Usman.
--
Good judgment is gained from experience. Experience is gained from bad judgment.
usman999_1 at 2007-11-10 8:10:54 >
