C Handle is invalid hatası (Kernel Module Driver Loader) (ÇÖZÜLDÜ!)

int call_kernel_driver(char * pid,HANDLE hDevice){
	
	
    printf("%s %d", "[+] Calling Driver, hiding PID:", atoi(pid));

    DWORD bytes_returned;
    char * retbuf;
    
    BOOL call_result = DeviceIoControl(
        hDevice,
        0x815,
        pid,
        strlen(pid) + 1,
        &retbuf,
        sizeof(retbuf),
        &bytes_returned,
        (LPOVERLAPPED) NULL);

    if (!call_result) {
    	printf("%d",call_result);
    	
    	printf("Error Code : %d",GetLastError());

        printf("[-] Error sending IRP to driver: %s ", GetLastErrorAsString());
        return -1;
    }

    printf("[+] IRP Sent, look for your process!");

}

BOOL DeviceIoControl(

    HANDLE hDevice,	// handle to device of interest
    DWORD dwIoControlCode,	// control code of operation to perform
    LPVOID lpInBuffer,	// pointer to buffer to supply input data
    DWORD nInBufferSize,	// size of input buffer
    LPVOID lpOutBuffer,	// pointer to buffer to receive output data
    DWORD nOutBufferSize,	// size of output buffer
    LPDWORD lpBytesReturned,	// pointer to variable to receive output byte count
    LPOVERLAPPED lpOverlapped 	// pointer to overlapped structure for asynchronous operation
   );

BOOL call_result DeviceIoControl(

    hDevice,	// handle to device of interest
    0x815,	// control code of operation to perform
    pid,	// pointer to buffer to supply input data
    strlen(pid)+1,	// size of input buffer
    &retbuf,	// pointer to buffer to receive output data
    sizeof(retbuf),	// size of output buffer
    &bytes_returned,	// pointer to variable to receive output byte count
    (LPOVERLAPPED) NULL 	// pointer to overlapped structure for asynchronous operation
   );