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An implementation example of DllMain() entrypoint with Golang. $ go build --buildmode=c-shared -o my.dll && rundll32.exe my.dll Test
package main
//#include "dllmain.h"
import "C"
#include <windows.h>
void OnProcessAttach(HINSTANCE, DWORD, LPVOID);
typedef struct {
HINSTANCE hinstDLL; // handle to DLL module
DWORD fdwReason; // reason for calling function // reserved
LPVOID lpReserved; // reserved
} MyThreadParams;
DWORD WINAPI MyThreadFunction(LPVOID lpParam) {
MyThreadParams params = *((MyThreadParams*)lpParam);
OnProcessAttach(params.hinstDLL, params.fdwReason, params.lpReserved);
free(lpParam);
return 0;
}
BOOL WINAPI DllMain(
HINSTANCE _hinstDLL, // handle to DLL module
DWORD _fdwReason, // reason for calling function
LPVOID _lpReserved) // reserved
{
switch (_fdwReason) {
case DLL_PROCESS_ATTACH:
// Initialize once for each new process.
// Return FALSE to fail DLL load.
{
MyThreadParams* lpThrdParam = (MyThreadParams*)malloc(sizeof(MyThreadParams));
lpThrdParam->hinstDLL = _hinstDLL;
lpThrdParam->fdwReason = _fdwReason;
lpThrdParam->lpReserved = _lpReserved;
HANDLE hThread = CreateThread(NULL, 0, MyThreadFunction, lpThrdParam, 0, NULL);
// CreateThread() because otherwise DllMain() is highly likely to deadlock.
}
break;
case DLL_PROCESS_DETACH:
// Perform any necessary cleanup.
break;
case DLL_THREAD_DETACH:
// Do thread-specific cleanup.
break;
case DLL_THREAD_ATTACH:
// Do thread-specific initialization.
break;
}
return TRUE; // Successful.
}
package main
import "C"
import (
"unsafe"
"github.com/nanitefactory/winmb"
)
//export Test
func Test() {
winmb.MessageBoxPlain("export Test", "export Test")
}
// OnProcessAttach is an async callback (hook).
//export OnProcessAttach
func OnProcessAttach(
hinstDLL unsafe.Pointer, // handle to DLL module
fdwReason uint32, // reason for calling function
lpReserved unsafe.Pointer, // reserved
) {
winmb.MessageBoxPlain("DLL_PROCESS_ATTACH", "DLL_PROCESS_ATTACH")
}
func main() {
// nothing really. xD
}
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