olepicture.cpp

EVC实现LCD屏

// OlePicture.cpp: implementation of the OlePicture class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "LCDSample.h"
#include "OlePicture.h"
#include "memory.h"



#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

OlePicture::OlePicture()
{

}

OlePicture::~OlePicture()
{

}

BOOL OlePicture::IsValidPicture()
{
	if (m_picture)
		return TRUE;
	else
		return FALSE;
}


BOOL OlePicture::LoadPicture(HMODULE hModule, UINT nIDResource, LPCTSTR lpszType)
{
	Close();

	// 把图片从资源中读入内存
	HRSRC hRes = ::FindResource(hModule, MAKEINTRESOURCE(nIDResource), lpszType);
	if (hRes == NULL)
		return FALSE;
	HGLOBAL hData = ::LoadResource(hModule, hRes);
	int size = ::SizeofResource(hModule, hRes);
	HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, size);
	//char *hMem = malloc(size);
	memcpy(::GlobalLock(hMem), ::LockResource(hData), size);
	::GlobalUnlock(hMem);

	// 创建流对象
	IStream* stream;
	::CreateStreamOnHGlobal(hMem, TRUE, &stream);

	// 从流对象创建图像对象
	if (::OleLoadPicture(stream, size, TRUE, IID_IPicture, (void**)&m_picture) != S_OK)
		m_picture = NULL;

	// 释放资源
	stream->Release();
	::GlobalFree(hMem);

	if (m_picture)
		return TRUE;	// 创建成功
	else
		return FALSE;	// 创建失败
}


BOOL OlePicture::LoadPicture(LPCTSTR lpszFileName)
{
	Close();

	// 把图片文件读入内存
	FILE* fp = fopen(lpszFileName, "rb");
	if (fp == NULL)
		return FALSE;	// 文件打不开，创建失败
	fseek(fp, 0, SEEK_END);
	int fsize = ftell(fp);
	fseek(fp, 0, SEEK_SET);
	if (fsize == 0)
	{
		// 文件尺寸为0，创建失败
		fclose(fp);
		return FALSE;
	}
	HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, fsize);
	fread(::GlobalLock(hMem), fsize, 1, fp);
	fclose(fp);
	::GlobalUnlock(hMem);

	// 创建流对象
	IStream* stream;
	::CreateStreamOnHGlobal(hMem, TRUE, &stream);

	// 从流对象创建图像对象
	if (::OleLoadPicture(stream, fsize, TRUE, IID_IPicture, (void**)&m_picture) != S_OK)
		m_picture = NULL;

	// 释放资源
	stream->Release();
	::GlobalFree(hMem);

	if (m_picture)
		return TRUE;	// 创建成功
	else
		return FALSE;	// 创建失败
}

SIZE OlePicture::GetPictureSize()
{
	if (m_picture)
	{
		// 获取图片尺寸
		OLE_XSIZE_HIMETRIC hmWidth;
		OLE_YSIZE_HIMETRIC hmHeight;
		m_picture->get_Width(&hmWidth);
		m_picture->get_Height(&hmHeight);
		SIZE sizePicture = {hmWidth, hmHeight};
		CDC dc;
		dc.CreateCompatibleDC(NULL);
		dc.HIMETRICtoDP(&sizePicture);
		return sizePicture;
	}
	else
		return CSize(0,0);
}


void OlePicture::DrawPicture(HDC hDC, int x, int y, int cx /*= 0*/, int cy /*= 0*/)
{
	if (m_picture)
	{
		SIZE sizeDevice = GetPictureSize();

		if (cx == 0)
		{
			// 把实际的宽度从像素单位(设备坐标)转换成逻辑坐标
			RECT rect = {0, 0, sizeDevice.cx, 0};
			CDC::FromHandle(hDC)->DPtoLP(&rect);
			cx = rect.right - rect.left;
		}

		if (cy == 0)
		{
			// 把实际的高度从像素单位(设备坐标)转换成逻辑坐标
			RECT rect = {0, 0, 0, sizeDevice.cy};
			CDC::FromHandle(hDC)->DPtoLP(&rect);
			cy = rect.bottom - rect.top;
		}

		// 绘制图片
		OLE_XSIZE_HIMETRIC hmWidth;
		OLE_YSIZE_HIMETRIC hmHeight;
		m_picture->get_Width(&hmWidth);
		m_picture->get_Height(&hmHeight);
		m_picture->Render(hDC, x, y, cx, cy, 0, hmHeight, hmWidth, -hmHeight, NULL);
	}
}

void OlePicture::Close()
{
	if (m_picture)
	{
		m_picture->Release();
		m_picture = NULL;
	}
}