public void GetInformation(ProcessInfo_t info)
{
// This is a little different, since the external process allocates the result.
// Straight up get the address of our target procedure.
// Error check is a MUST here especially, but not included for the sake of a clean demo.
IntPtr ptrGetInformation = ippc.GetRemoteProcAddress(info.ptrHandle, info.ptrBaseAddress, "GetInformation");
// Call the procedure and get a return value.
// The return value will contain a pointer to the result structure.
IntPtr ptrThreadHandle = ippc.Run(info.ptrHandle, ptrGetInformation, IntPtr.Zero);
uint uiResult = ippc.GetThreadReturnValue(ptrThreadHandle);
if (uiResult == 0)
{
Console.WriteLine("The foreign procedure returned NULL.");
return;
}
// Success! We now have a pointer. Time to read it!
GetInformation_t result = new GetInformation_t();
result = (GetInformation_t)ippc.ReadStruct(info.ptrHandle, new IntPtr(uiResult), result);
// Our string is currently a pointer! So we must read this now.
string strOutput = ippc.ReadString(info.ptrHandle, result.ptrString);
// result will now contain our information. Let's take a peek!
Console.WriteLine("C++ says: " + strOutput);
Console.WriteLine("C++ gave us a number: " + result.iRandomNumber);
// Done!
ippc.FreeMemory(info.ptrHandle, result.ptrString);
ippc.FreeMemory(info.ptrHandle, new IntPtr(uiResult));
}
private void GetInformation(ProcessInfo_t info)
{
Console.Clear();
Console.WriteLine("You chose to find out what C++ wants to say!");
/* THE COOL STUFF STARTS HERE */
cool.GetInformation(info);
}
private void PrintInfo(ProcessInfo_t info)
{
Console.Clear();
Console.WriteLine("You chose to print information to the example executable.");
Console.Write("String to send: ");
string str = Console.ReadLine();
/* THE COOL STUFF STARTS HERE */
cool.PrintInfo(info, str);
}
private void ProcessInput(string input)
{
ProcessInfo_t info = GetProcessHandle();
if (info.ptrHandle == IntPtr.Zero)
{
return;
}
switch (input)
{
case "send":
PrintInfo(info);
return;
case "get":
GetInformation(info);
return;
default:
return;
}
}
public void PrintInfo(ProcessInfo_t info, string strInput)
{
PrintInfo_t print = new PrintInfo_t();
// We want to write all data to the foreign process first.
// Begin with the string.
IntPtr ptrWrittenString = ippc.WriteString(info.ptrHandle, strInput);
print.iStringLen = strInput.Length;
print.ptrString = ptrWrittenString;
// In a real life scenario, you could just call the function with just ptrWrittenString,
// but our demo is here to show you how you can write more than JUST a single parameter, with the use of Marshal.StructureToPtr().
// We've now written our structure to the foreign process and have a pointer in return!
IntPtr ptrForeignStruct = ippc.WriteStruct(info.ptrHandle, (object)print);
// Now we need the address of the exported function we want to call.
// Error check is a MUST here especially, but not included for the sake of a clean demo.
IntPtr ptrPrintInfo = ippc.GetRemoteProcAddress(info.ptrHandle, info.ptrBaseAddress, "PrintInfo");
// Now that we have all information, we can safely run this.
IntPtr ptrThreadHandle = ippc.Run(info.ptrHandle, ptrPrintInfo, ptrForeignStruct);
// We have a handle to the thread. We need to know when its completed, so we can release our memory.
uint uiReturnValue = ippc.GetThreadReturnValue(ptrThreadHandle);
// This will be 1 if it succeeded!
if (uiReturnValue != 1)
{
Console.WriteLine("Failed to call remote procedure!");
return;
}
// Done!
ippc.FreeMemory(info.ptrHandle, ptrForeignStruct);
ippc.FreeMemory(info.ptrHandle, ptrWrittenString);
}