code_app/build/windows/HGTest/HGTestDlg.cpp

// HGTestDlg.cpp: 实现文件
//

#include "pch.h"
#include "framework.h"
#include "HGTest.h"
#include "HGTestDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

class CAboutDlg : public CDialogEx
{
public:
	CAboutDlg();

// 对话框数据
#ifdef AFX_DESIGN_TIME
	enum { IDD = IDD_ABOUTBOX };
#endif

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CHGTestDlg 对话框



CHGTestDlg::CHGTestDlg(CWnd* pParent /*=nullptr*/)
	: CDialogEx(IDD_HGTEST_DIALOG, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

	m_dsm = NULL;
	m_ds = NULL;
}

void CHGTestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CHGTestDlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, &CHGTestDlg::OnBnClickedButton1)
	ON_BN_CLICKED(IDC_BUTTON2, &CHGTestDlg::OnBnClickedButton2)
END_MESSAGE_MAP()


// CHGTestDlg 消息处理程序

BOOL CHGTestDlg::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	// 将“关于...”菜单项添加到系统菜单中。

	// IDM_ABOUTBOX 必须在系统命令范围内。
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != nullptr)
	{
		BOOL bNameValid;
		CString strAboutMenu;
		bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
		ASSERT(bNameValid);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// 设置此对话框的图标。  当应用程序主窗口不是对话框时，框架将自动
	//  执行此操作
	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	HGTwain_LoadDSM(&m_dsm);
	HGTwain_OpenDSM(m_dsm, m_hWnd, DSEventCallback, this);

	return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

void CHGTestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialogEx::OnSysCommand(nID, lParam);
	}
}

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。  对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CHGTestDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialogEx::OnPaint();
	}
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CHGTestDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void CHGTestDlg::OnBnClickedButton1()
{
	if (NULL != m_ds)
	{
		return;
	}

	HGTwain_SelectDS(m_dsm, &m_ds);
	if (NULL != m_ds)
	{
		HGTwain_OpenDS(m_ds);
		HGTwain_EnableDS(m_ds, HGTRUE, NULL);
	}
}


void CHGTestDlg::OnBnClickedButton2()
{
	HGTwain_CloseDS(m_ds);
	m_ds = NULL;
}

void CHGTestDlg::DSEventCallback(HGTwainDS ds, HGUInt event, HGPointer param)
{
	CHGTestDlg* p = (CHGTestDlg*)param;
	if (HGTWAIN_DSEVENT_XFERREADY == event)
	{
		ULONG idx = 0;

		HGImage image = NULL;
		HGTwain_ImageNativeXfer(p->m_ds, 0, HGBASE_IMGORIGIN_TOP, &image);
		CStringA strName;
		strName.Format("D:\\Twain_%u.bmp", idx);
		HGImgFmt_SaveImage(image, 0, NULL, strName);
		HGBase_DestroyImage(image);

		HGUInt count = 0;
		HGTwain_EndXfer(p->m_ds, &count);
		while (count != 0)
		{
			++idx;

			HGImage image = NULL;
			HGTwain_ImageNativeXfer(p->m_ds, 0, HGBASE_IMGORIGIN_TOP, &image);
			CStringA strName;
			strName.Format("D:\\Twain_%u.bmp", idx);
			HGImgFmt_SaveImage(image, 0, NULL, strName);
			HGBase_DestroyImage(image);

			HGTwain_EndXfer(p->m_ds, &count);
		}

		HGTwain_Reset(p->m_ds);
	}
	else if (HGTWAIN_DSEVENT_CLOSEDSREQ == event)
	{
		HGTwain_CloseDS(p->m_ds);
		p->m_ds = NULL;
	}
	else if (HGTWAIN_DSEVENT_CLOSEDSOK == event)
	{
		HGTwain_CloseDS(p->m_ds);
		p->m_ds = NULL;
	}
}