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TraxMate
Master Cheater
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Joined: 01 Mar 2008
Posts: 363
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 Posted: Sun Oct 19, 2008 1:13 pm Post subject: [C++] How do I use a function from a separate dll? |
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| The title says it all. I've searched and I didn't come up with a way to do it.
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lurc
Grandmaster Cheater Supreme
 Reputation: 2
Joined: 13 Nov 2006
Posts: 1900
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| Posted: Sun Oct 19, 2008 1:41 pm Post subject: |
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Here's some sample code that I'll quickly code for ya here (sorry for errors if they occur.)
EXE:
| Code: | #include <Windows.h>
#include <Tchar.h>
typedef INT (WINAPI * _Add)(__in INT nNum1, __in INT nNum2);
_Add Add;
BOOL WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nShowCmd)
{
UNREFERENCED_PARAMETER(hInstance);
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
UNREFERENCED_PARAMETER(nShowCmd);
HMODULE hDLL = NULL;
int nAdded = NULL;
LPTSTR lpAdded = (LPTSTR)HeapAlloc(GetProcessHeap(), 0, sizeof(TCHAR)*5);
if (lpAdded != NULL)
{
hDLL = LoadLibrary(_T("Add.dll"));
Add = (_Add)GetProcAddress(hDLL, "Add");
if ((DWORD)Add != NULL)
{
nAdded = Add(10, 15);
wsprintf(lpAdded, _T("%d"), nAdded);
MessageBox(NULL, lpAdded, _T("Add function ret"), MB_OK);
}
HeapFree(GetProcessHeap(), 0, (LPVOID)lpAdded);
}
return 0;
} |
DLL:
| Code: | #include <Windows.h>
__declspec(dllexport) INT WINAPI Add(__in INT nNum1, __in INT nNum2)
{
return (nNum1 + nNum2);
}
BOOL WINAPI DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
{
UNREFERENCED_PARAMETER(hModule);
UNREFERENCED_PARAMETER(dwReason);
UNREFERENCED_PARAMETER(lpReserved);
return TRUE;
} |
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TraxMate
Master Cheater
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Joined: 01 Mar 2008
Posts: 363
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| Posted: Sun Oct 19, 2008 2:57 pm Post subject: |
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Thx  . Now it's time to study the code and learn ^^-
EDIT: When I'm adding this to the dll:
| Code: | void omg()
{
MessageBox(NULL, _T("Test"), _T("Test"), MB_OK);
} |
and add a CreateThread like this | Code: | BOOL WINAPI DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
{
UNREFERENCED_PARAMETER(hModule);
UNREFERENCED_PARAMETER(dwReason);
UNREFERENCED_PARAMETER(lpReserved);
CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)omg, NULL, NULL, NULL);
return TRUE;
} |
Why does it spam the messagebox like in a loop? And it's not like a normal loop when you click OK it pops up again, now it's popping up all the time lagging up my comp so i have to restart it.
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lurc
Grandmaster Cheater Supreme
Reputation: 2
Joined: 13 Nov 2006
Posts: 1900
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| Posted: Sun Oct 19, 2008 3:02 pm Post subject: |
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Because DllMain has 4 different ways of being called.
DLL_PROCESS_ATTACH
DLL_PROCESS_DETACH
DLL_THREAD_ATTACH
DLL_THREAD_DETACH
so if you wanted to make it message box once, do
| Code: | if (dwReason == DLL_PROCESS_ATTACH)
CreateThread(...) |
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TraxMate
Master Cheater
![]() Reputation: 0
Joined: 01 Mar 2008
Posts: 363
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| Posted: Mon Oct 20, 2008 8:09 am Post subject: |
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oh yeah.. forgot that  . Thanks again lurc, i would +rep you if i could.
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