// Copyright (c) 2020 Lv Decai, Shenzhen, China.
// Filename: IpcUtility.cpp
// Version: 1.0
// Release date: 2020年10月11日
// License: MIT (http://opensource.org/licenses/MIT)

#include "StdAfx.h"
#include "IpcUtility.h"

NAMESPACE_BEGIN;

// 向指定窗口发送 WM_COPYDATA 消息,传递数据
int IpcUtility::SendIpcMessage(DWORD iMessageType, PCVOID pData, DWORD iLength, HWND hWnd)
{
	if (pData == NULL || iLength == 0)
	{
		return ERROR_INVALID_PARAMETER;
	}

	COPYDATASTRUCT CopyData = { 0 };

	CopyData.dwData = iMessageType;
	CopyData.lpData = (PVOID) pData;
	CopyData.cbData = iLength;

	LRESULT lResult = SendMessage(hWnd, WM_COPYDATA, 0, (LPARAM) &CopyData);

	DWORD iLastError = GetLastError();

	return iLastError == ERROR_SUCCESS ? (int) lResult : iLastError;
}

// 向指定窗口发送 WM_COPYDATA 消息,传递数据
int IpcUtility::SendIpcMessage(DWORD iMessageType, PCVOID pData, DWORD iLength, PCTSTR sWindowTitle, PCTSTR sWindowClass)
{
	if (pData == NULL || iLength == 0)
	{
		return ERROR_INVALID_PARAMETER;
	}

	HWND hWnd = FindWindow(sWindowClass, sWindowTitle);

	if (hWnd == NULL)
	{
		return ERROR_INVALID_WINDOW_HANDLE;
	}

	return SendIpcMessage(iMessageType, pData, iLength, hWnd);
}

// 解析接收到的外部程序发来的消息,回调处理函数
int IpcUtility::ParseIpcMessageAndProcess(UINT iMessage, WPARAM wParam, LPARAM lParam, IIpcMessageProcessor* pProcessor)
{
	if (iMessage == WM_COPYDATA)
	{
		COPYDATASTRUCT* pCopyData = (COPYDATASTRUCT*) lParam;

		if (pCopyData != NULL
			&& pProcessor != NULL)
		{
			return pProcessor->OnIpcMessage((UINT) pCopyData->dwData, pCopyData->lpData, pCopyData->cbData);
		}
	}

	return ERROR_MESSAGE_NOT_HANDLED;
}

NAMESPACE_END;