主要描述：
用VC2019+MFC 创建一个DLL封装MD工业相机库，再建一个EXE调用这个相机库采图并且显示。
先创建库工程：
新建一个库工程，
创建完成，添加一个DllFunction.h头文件，一个DllFunction.cpp 源文件
拷贝相关SDK文件到对应的目录下
(略，自行拷贝到相应位置，路径加进工程)
源码如下
DllFunction.h
#pragma onceextern "C" __declspec(dllexport) int InitCamera(int indexCam = 0);
extern "C" __declspec(dllexport) int GetImage();
extern "C" __declspec(dllexport) int Reconnect();
extern "C" __declspec(dllexport) int UninitCamera();
DllFunction.cpp
#pragma once#include <Windows.h>
//引用相机的SDK包，lib文件的路径根据您的开发环境修改。
#include "CameraApi.h"
#include "CameraGrabber.h"
#ifdef _WIN64
#pragma comment(lib, "..\\MVCAMSDK_X64.lib")
#else
#pragma comment(lib, "..\\MVCAMSDK.lib")
#endiftSdkCameraCapbility m_sCameraInfo; //相机特性描述
UINT m_threadID;//图像抓取线程的ID
HANDLE m_hDispThread;//图像抓取线程的句柄
BOOL m_bExit;//用来通知图像抓取线程结束
BOOL m_bTrigger;
double m_fExpTime;//当前的帧曝光时间，单位为us
double m_fExpLineTime;//当前的行曝光时间，单位为us
INT m_iAnalogGain;//当前的信号模拟增益值，步进值为m_fAnalogGainStepBYTE* m_pFrameBuffer;//用于将原始图像数据转换为RGB的缓冲区（采集线程中）
BYTE* pOutBuffer;
BOOL m_bPause;//是否暂停图像
CameraHandle m_hCamera; //相机的设备句柄|the handle of the camera we use
tSdkFrameHead m_sFrInfo;//用于保存当前图像帧的帧头信息//功能：初始化相机，进行相机的初始化操作
extern "C" __declspec(dllexport) int InitCamera(int indexCam = 0)
{if (m_hCamera != 0){if (NULL != m_hDispThread){m_bExit = TRUE;::WaitForSingleObject(m_hDispThread, INFINITE);CloseHandle(m_hDispThread);m_hDispThread = NULL;}CameraStop(m_hCamera);CameraUnInit(m_hCamera);}CameraSetCallbackFunction(m_hCamera, NULL, (PVOID)0, NULL);tSdkCameraDevInfo sCameraList[10];INT iCameraNums;CameraSdkStatus status;CameraSdkInit(1);void* m_Grabber;tSdkCameraDevInfo m_DevInfo;status = CameraGrabber_CreateFromDevicePage(&m_Grabber);if (status != CAMERA_STATUS_SUCCESS){return -1;}CameraGrabber_GetCameraDevInfo(m_Grabber, &m_DevInfo);CameraGrabber_GetCameraHandle(m_Grabber, &m_hCamera);CameraGetCapability(m_hCamera, &m_sCameraInfo);m_pFrameBuffer = CameraAlignMalloc(m_sCameraInfo.sResolutionRange.iWidthMax * 200000, 16); //20万行线扫BOOL m_bMonoSensor = m_sCameraInfo.sIspCapacity.bMonoSensor;if (m_sCameraInfo.sIspCapacity.bMonoSensor){CameraSetIspOutFormat(m_hCamera, CAMERA_MEDIA_TYPE_MONO8);}CameraSetTriggerMode(m_hCamera, 1);CameraPlay(m_hCamera);return 0;
}extern "C" __declspec(dllexport) int GetImage()
{tSdkFrameHead sFrameInfo;BYTE* pbyBuffer;CameraSdkStatus status;CameraSoftTrigger(m_hCamera);status = CameraGetImageBuffer(m_hCamera, &sFrameInfo, &pbyBuffer, 10000);if (status == CAMERA_STATUS_SUCCESS){status = CameraImageProcess(m_hCamera, pbyBuffer, m_pFrameBuffer, &sFrameInfo); status = CameraSaveImage(m_hCamera, (char*)"H:\\test.bmp", m_pFrameBuffer, &sFrameInfo, FILE_BMP, 100); //no -22CameraReleaseImageBuffer(m_hCamera, pbyBuffer);}return status;
}extern "C" __declspec(dllexport) int Reconnect()
{CameraSdkStatus status = CameraReConnect(m_hCamera);return status;
}extern "C" __declspec(dllexport) int UninitCamera()
{CameraSdkStatus status = CameraUnInit(m_hCamera);CameraAlignFree(m_pFrameBuffer);return status;
}再创建一个exe程序，用来调用创建的dll文件 。
创建，下一步选择基于对话框的项目，下一步后的打印相关的、COM相关的全部不用选择，其他的默认就可以。
拖拉一些控件到对话框窗口上，最终如下图
文件源码如下
MindVisionCallDlg.h: 头文件
#pragma once// CMindVisionCallDlg 对话框
class CMindVisionCallDlg : public CDialogEx
{
// 构造
public:CMindVisionCallDlg(CWnd* pParent = nullptr); // 标准构造函数// 对话框数据
#ifdef AFX_DESIGN_TIMEenum { IDD = IDD_MINDVISIONCALL_DIALOG };
#endifprotected:virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持// 实现
protected:HICON m_hIcon;// 生成的消息映射函数virtual BOOL OnInitDialog();afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();DECLARE_MESSAGE_MAP()
public:afx_msg void OnBnClickedBtnInit();afx_msg void OnBnClickedBtnReconn();afx_msg void OnBnClickedBtnGrab();afx_msg void OnClose();CStatic m_cPreview;
};
MindVisionCallDlg.cpp: 实现文件
#include "pch.h"
#include "framework.h"
#include "MindVisionCall.h"
#include "MindVisionCallDlg.h"
#include "afxdialogex.h"#include "DllFunction.h"#ifdef _DEBUG
#define new DEBUG_NEW
#endifCMindVisionCallDlg::CMindVisionCallDlg(CWnd* pParent /*=nullptr*/): CDialogEx(IDD_MINDVISIONCALL_DIALOG, pParent)
{m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CMindVisionCallDlg::DoDataExchange(CDataExchange* pDX)
{CDialogEx::DoDataExchange(pDX);DDX_Control(pDX, IDC_STATIC_PREVIEW, m_cPreview);
}BEGIN_MESSAGE_MAP(CMindVisionCallDlg, CDialogEx)ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BTN_INIT, &CMindVisionCallDlg::OnBnClickedBtnInit)ON_BN_CLICKED(IDC_BTN_RECONN, &CMindVisionCallDlg::OnBnClickedBtnReconn)ON_BN_CLICKED(IDC_BTN_GRAB, &CMindVisionCallDlg::OnBnClickedBtnGrab)ON_WM_CLOSE()
END_MESSAGE_MAP()BOOL CMindVisionCallDlg::OnInitDialog()
{CDialogEx::OnInitDialog();SetIcon(m_hIcon, TRUE); // 设置大图标SetIcon(m_hIcon, FALSE); // 设置小图标return TRUE; // 除非将焦点设置到控件，否则返回 TRUE
}void CMindVisionCallDlg::OnPaint()
{if (IsIconic()){CPaintDC dc(this);SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);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;dc.DrawIcon(x, y, m_hIcon);}else{CDialogEx::OnPaint();}
}HCURSOR CMindVisionCallDlg::OnQueryDragIcon()
{return static_cast<HCURSOR>(m_hIcon);
}void CMindVisionCallDlg::OnBnClickedBtnInit()
{int code = InitCamera(1);if (code){}CString Info;Info.Format(_T("Result = %d"), code);SetDlgItemText(IDC_STC_INFO, Info);
}void CMindVisionCallDlg::OnBnClickedBtnReconn()
{int code = Reconnect();if (code){}CString Info;Info.Format(_T("Result = %d"), code);SetDlgItemText(IDC_STC_INFO, Info);
}void CMindVisionCallDlg::OnBnClickedBtnGrab()
{int code = GetImage();if (0 == code){CClientDC dc(this);CDC* mdc = new CDC;mdc->CreateCompatibleDC(&dc);CBitmap bitmap;bitmap.m_hObject = (HBITMAP)::LoadImageA(AfxGetInstanceHandle(), (char*)"H:\\test.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);mdc->SelectObject(bitmap);CRect rect;::GetWindowRect(m_cPreview.GetSafeHwnd(), &rect);ScreenToClient(&rect);BITMAP sBitMap;bitmap.GetBitmap(&sBitMap);dc.StretchBlt(rect.left, rect.top, rect.Width(), rect.Height(), mdc, 0, 0, sBitMap.bmWidth, sBitMap.bmHeight, SRCCOPY);delete mdc;}CString Info;Info.Format(_T("Result = %d"), code);SetDlgItemText(IDC_STC_INFO, Info);
}void CMindVisionCallDlg::OnClose()
{int code = UninitCamera();if (code){}CDialogEx::OnClose();
}
两个工程保存在同一个方案，然后建立项目依赖，如此就两个工程一起编译。
最后运行效果，
(本节结束)