C++编写截屏软件（ScreenCapture_v1.0.0）

Posted 2021-05-07 默库

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“ScreenCapture.exe”又名“简约截屏.exe”

源码链接：https://github.com/imoki/ScreenCapture程序下载链接：https://github.com/imoki/ScreenCapture/releases/download/v1.0.0/ScreenCapture_v1.0.0.exe

演示

程序大小187KB

双击运行程序

按快捷键“Ctrl+U”，然后用鼠标左键滑动屏幕选择区域，选择好要截屏的区域后“快速双击左键”即可截屏

程序会在后台运行，还想截屏就按“Ctrl+U”，鼠标选择截屏区域，双击左键完成截屏。

如果不想再运行程序了，按“Ctrl+I”即可关闭后台运行，此时已退出程序。

C++源码

github链接：https://github.com/imoki/ScreenCapture

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ScreenCapture.cpp

// ScreenCapture.cpp : Defines the class behaviors for the application.#include "stdafx.h"#include "ScreenCapture.h"#include "ScreenCaptureDlg.h"
#ifdef _DEBUG#define new DEBUG_NEW#endif// CScreenCaptureAppBEGIN_MESSAGE_MAP(CScreenCaptureApp, CWinApp) ON_COMMAND(ID_HELP, &CWinApp::OnHelp)END_MESSAGE_MAP()// CScreenCaptureApp constructionCScreenCaptureApp::CScreenCaptureApp(){ // support Restart Manager  m_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_RESTART; // TODO: add construction code here, // Place all significant initialization in InitInstance}

// The one and only CScreenCaptureApp objectCScreenCaptureApp theApp;// CScreenCaptureApp initializationBOOL CScreenCaptureApp::InitInstance(){ // InitCommonControlsEx() is required on Windows XP if an application // manifest specifies use of ComCtl32.dll version 6 or later to enable // visual styles. Otherwise, any window creation will fail. INITCOMMONCONTROLSEX InitCtrls; InitCtrls.dwSize = sizeof(InitCtrls); // Set this to include all the common control classes you want to use // in your application. InitCtrls.dwICC = ICC_WIN95_CLASSES;  InitCommonControlsEx(&InitCtrls);  CWinApp::InitInstance();  AfxEnableControlContainer(); // Create the shell manager, in case the dialog contains // any shell tree view or shell list view controls. CShellManager *pShellManager = new CShellManager;
 // Activate "Windows Native" visual manager for enabling themes in MFC controls  CMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerWindows)); // Standard initialization // If you are not using these features and wish to reduce the size // of your final executable, you should remove from the following // the specific initialization routines you do not need // Change the registry key under which our settings are stored // TODO: You should modify this string to be something appropriate // such as the name of your company or organization SetRegistryKey(_T("Local AppWizard-Generated Applications"));
 CScreenCaptureDlg dlg; m_pMainWnd = &dlg; INT_PTR nResponse = dlg.DoModal(); if (nResponse == IDOK) { // TODO: Place code here to handle when the dialog is // dismissed with OK } else if (nResponse == IDCANCEL) { // TODO: Place code here to handle when the dialog is // dismissed with Cancel } else if (nResponse == -1) { TRACE(traceAppMsg, 0, "Warning: dialog creation failed, so application is terminating unexpectedly.\n"); TRACE(traceAppMsg, 0, "Warning: if you are using MFC controls on the dialog, you cannot #define _AFX_NO_MFC_CONTROLS_IN_DIALOGS.\n"); }
 // Delete the shell manager created above. if (pShellManager != NULL) { delete pShellManager; }
 // Since the dialog has been closed, return FALSE so that we exit the // application, rather than start the application's message pump. return FALSE;}

ScreenCapture.h

// ScreenCapture.h : main header file for the PROJECT_NAME application//#pragma once#ifndef __AFXWIN_H__ #error "include 'stdafx.h' before including this file for PCH"#endif#include "resource.h"    // main symbols// CScreenCaptureApp:// See ScreenCapture.cpp for the implementation of this class//
class CScreenCaptureApp : public CWinApp{public:  CScreenCaptureApp();// Overridespublic:  virtual BOOL InitInstance();// Implementation DECLARE_MESSAGE_MAP()};extern CScreenCaptureApp theApp;

ScreenCaptureDlg.cpp

这是绘制初始化窗口，以及实现快捷键功能的代码

// ScreenCaptureDlg.cpp : implementation file//#include "stdafx.h"#include "ScreenCapture.h"#include "ScreenCaptureDlg.h"#include "afxdialogex.h"#include "ShowDlg.h" // 点击截屏后弹出开始截屏的类
#ifdef _DEBUG#define new DEBUG_NEW#endif// CScreenCaptureDlg dialogCScreenCaptureDlg::CScreenCaptureDlg(CWnd* pParent /*=NULL*/) : CDialogEx(CScreenCaptureDlg::IDD, pParent){ m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}
void CScreenCaptureDlg::DoDataExchange(CDataExchange* pDX){ CDialogEx::DoDataExchange(pDX);}
BEGIN_MESSAGE_MAP(CScreenCaptureDlg, CDialogEx) ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_BUTTON1, &CScreenCaptureDlg::OnBnClickedButton1) ON_BN_CLICKED(IDC_BUTTON3, &CScreenCaptureDlg::OnBnClickedButton3) ON_WM_HOTKEY() //快捷键END_MESSAGE_MAP()

// CScreenCaptureDlg message handlers
BOOL CScreenCaptureDlg::OnInitDialog(){  CDialogEx::OnInitDialog(); // Set the icon for this dialog. The framework does this automatically // when the application's main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon  SetIcon(m_hIcon, FALSE);    // Set small icon // 快捷键 ::RegisterHotKey(m_hWnd, 199, MOD_CONTROL, 'U'); // 注册的热键id为199，可以自己改，Ctrl+U。MOD_ALU就是Alt ::RegisterHotKey(m_hWnd, 200, MOD_CONTROL, 'I'); // TODO: Add extra initialization here
 return TRUE; // return TRUE unless you set the focus to a control}
//快捷键void CScreenCaptureDlg::OnHotKey(UINT nHotKeyID, UINT nKey1, UINT nKey2){ if (nHotKeyID == 199) { //AfxMessageBox(_T("使用了热键")); //DoModal(); ShowWindow(SW_HIDE); // 点击完后隐藏此对话框 Sleep(500); // 休眠500毫秒，以免截屏太快，上面的对话框没来得及完全消失 CShowDlg dlg; // 定义点击截图后弹出的窗口 dlg.DoModal(); // 模态，点击截图，则弹出窗口 return; } if (nHotKeyID == 200) { //AfxMessageBox(_T("使用了热键")); //DoModal(); exit(0); return; } CDialogEx::OnHotKey(nHotKeyID, nKey1, nKey2);}
BOOL CScreenCaptureDlg::DestroyWindow(){ // TODO: Add your specialized code here and/or call the base class ::UnregisterHotKey(m_hWnd, 199); return CDialogEx::DestroyWindow();}// If you add a minimize button to your dialog, you will need the code below// to draw the icon. For MFC applications using the document/view model,// this is automatically done for you by the framework.
void CScreenCaptureDlg::OnPaint(){ if (IsIconic()) { CPaintDC dc(this); // device context for painting
 SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
 // Center icon in client rectangle 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;
 // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialogEx::OnPaint(); }}
// The system calls this function to obtain the cursor to display while the user drags// the minimized window.HCURSOR CScreenCaptureDlg::OnQueryDragIcon(){ return static_cast<HCURSOR>(m_hIcon);}// 截图按钮void CScreenCaptureDlg::OnBnClickedButton1(){ ShowWindow(SW_HIDE); // 点击完后隐藏此对话框 Sleep(500); // 休眠500毫秒，以免截屏太快，上面的对话框没来得及完全消失 CShowDlg dlg; // 定义点击截图后弹出的窗口 dlg.DoModal(); // 模态，点击截图，则弹出窗口}
void CScreenCaptureDlg::OnBnClickedButton3(){ // TODO: Add your control notification handler code here //CShowDlg dlg; // 定义点击截图后弹出的窗口 //dlg.DoModal(); // 模态，点击截图，则弹出窗口 ShowWindow(SW_HIDE); // 点击完后隐藏此对话框}

ScreenCaptureDlg.h

// ScreenCaptureDlg.h : header file//#pragma once// CScreenCaptureDlg dialogclass CScreenCaptureDlg : public CDialogEx{// Constructionpublic: CScreenCaptureDlg(CWnd* pParent = NULL); // standard constructor
// Dialog Data  enum { IDD = IDD_SCREENCAPTURE_DIALOG }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support// Implementationprotected:  HICON m_hIcon; // Generated message map functions virtual BOOL OnInitDialog(); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); DECLARE_MESSAGE_MAP()public: afx_msg void OnBnClickedButton1(); afx_msg void OnBnClickedButton3(); // 快捷键 afx_msg void OnHotKey(UINT nHotKeyID, UINT nKey1, UINT nKey2); virtual BOOL DestroyWindow();};

ShowDlg.cpp

用来绘制截屏区域，就是绘制如下的黑框框

// ShowDlg.cpp : implementation file//
#include "stdafx.h"#include "ScreenCapture.h"#include "ShowDlg.h"#include "afxdialogex.h"
// CShowDlg dialog
IMPLEMENT_DYNAMIC(CShowDlg, CDialogEx)
CShowDlg::CShowDlg(CWnd* pParent /*=NULL*/) : CDialogEx(CShowDlg::IDD, pParent){  // 采集屏幕当前瞬间的图像 // 获取屏幕的宽和高 m_nWidth = GetSystemMetrics(SM_CXSCREEN); m_nHeight = GetSystemMetrics(SM_CYSCREEN);  // 获取桌面DC // 设备上下文 CDC *pDC = GetDesktopWindow()->GetDC(); // 创建位图 CBitmap bmp; bmp.CreateCompatibleBitmap(pDC, m_nWidth, m_nHeight); // 创建内存DC m_memDC.CreateCompatibleDC(pDC); m_memDC.SelectObject(&bmp); m_memDC.BitBlt(0, 0, m_nWidth, m_nHeight, pDC, 0, 0, SRCCOPY);
 // 释放DC，释放GDI对象 pDC->DeleteDC(); bmp.DeleteObject();
}
CShowDlg::~CShowDlg(){}
void CShowDlg::DoDataExchange(CDataExchange* pDX){ CDialogEx::DoDataExchange(pDX);}

BEGIN_MESSAGE_MAP(CShowDlg, CDialogEx) ON_WM_PAINT() ON_WM_LBUTTONDOWN() ON_WM_LBUTTONDBLCLK() //ON_MESSAGE(WM_HOTKEY,OnHotKey)  //ON_WM_HOTKEY() //快捷键END_MESSAGE_MAP()// CShowDlg message handlers// 初始化BOOL CShowDlg::OnInitDialog(){ CDialogEx::OnInitDialog();
 // 快捷键 ::RegisterHotKey(m_hWnd, 199, MOD_CONTROL, 'U'); // 注册的热键id为199，可以自己改，Ctrl+U。MOD_ALU就是Alt
 // 将窗口移动，调节成和屏幕一样大,前两位参数是移动到的初始坐标在左上角，后两位的最后的坐标在右下角 MoveWindow(0, 0, m_nWidth, m_nHeight);  // 初始化橡皮筋 // resizeInside是点向里，resizeOutside点向外，dottedline是虚线,solidLine是实线 m_tracker.m_nStyle = (CRectTracker::resizeInside | CRectTracker::solidLine);  m_tracker.m_nHandleSize = 5; // 控制柄的像素大小 m_tracker.m_rect.SetRect(0, 0, 0, 0); // 初始化选框大小，没有大小  return TRUE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE}
/*//快捷键void CShowDlg::OnHotKey(UINT nHotKeyID, UINT nKey1, UINT nKey2){ if (nHotKeyID == 199) { AfxMessageBox(_T("使用了热键")); //DoModal(); return; } CDialogEx::OnHotKey(nHotKeyID, nKey1, nKey2);}
BOOL CShowDlg::DestroyWindow(){ // TODO: Add your specialized code here and/or call the base class ::UnregisterHotKey(m_hWnd, 199); return CDialogEx::DestroyWindow();}*/
void CShowDlg::OnPaint(){ CPaintDC dc(this); // device context for painting // TODO: Add your message handler code here // Do not call CDialogEx::OnPaint() for painting messages
 // 将桌面图像显示到对话框上，达到一截屏就屏幕就“不动” dc.BitBlt(0, 0, m_nWidth, m_nHeight, &m_memDC, 0, 0, SRCCOPY);
 // 绘制橡皮筋 m_tracker.Draw(&dc);}

void CShowDlg::OnLButtonDown(UINT nFlags, CPoint point){ // TODO: Add your message handler code here and/or call default
 // 选择函数，按F1可以自动去浏览器查找说明。这里是HitTest的返回值 // CRectTracker::hitNothing –1 // CRectTracker::hitTopLeft 0 // CRectTracker::hitTopRight 1 // CRectTracker::hitBottomRight 2 // CRectTracker::hitBottomLeft 3 // CRectTracker::hitTop 4 // CRectTracker::hitRight 5 // CRectTracker::hitBottom 6 // CRectTracker::hitLeft 7 // CRectTracker::hitMiddle 8
 // 如果点中的区域是上一次框选的区域，那么不会出现画，否则就可以在另一个区域重新框选 if (m_tracker.HitTest(point) == CRectTracker::hitNothing) { m_tracker.TrackRubberBand(this, point, TRUE); // 是否允许翻转，TRUE是允许，FALSE是不允许 m_tracker.m_rect.NormalizeRect(); // 如果允许翻转那么需要让矩形坐标正常化 } else // 如果鼠标点在选取里面，则可以移动选区 { m_tracker.Track(this, point, TRUE); // 挪动选区,如果是边则可以改变大小，在内部则可以移动 m_tracker.m_rect.NormalizeRect(); }
 Invalidate(FALSE); // FALSE刷新不擦除背景
 CDialogEx::OnLButtonDown(nFlags, point);}
// 双击void CShowDlg::OnLButtonDblClk(UINT nFlags, CPoint point){ // TODO: Add your message handler code here and/or call default  // 获取选框大小 int nWidth = m_tracker.m_rect.Width(); int nHeight = m_tracker.m_rect.Height(); // 创建一个位图 CBitmap bmp; bmp.CreateCompatibleBitmap(&m_memDC, nWidth, nHeight);  // 做一个临时内存DC CDC tempDC; tempDC.CreateCompatibleDC(NULL); tempDC.SelectObject(&bmp); // 复制数据 tempDC.BitBlt(0, 0, nWidth, nHeight, &m_memDC, m_tracker.m_rect.left, m_tracker.m_rect.top, SRCCOPY);
 // 放到剪切板里，先打开剪切板 OpenClipboard(); // 清空剪切板 EmptyClipboard(); // 设置剪切板数据 SetClipboardData(CF_BITMAP, bmp); // 关闭剪切板 CloseClipboard();
 // 结束程序 //exit(0); EndDialog(0);
 CDialogEx::OnLButtonDblClk(nFlags, point);}

ShowDlg.h

#pragma once// CShowDlg dialogclass CShowDlg : public CDialogEx{ DECLARE_DYNAMIC(CShowDlg)
public: CShowDlg(CWnd* pParent = NULL); // standard constructor virtual ~CShowDlg();
// Dialog Data enum { IDD = IDD_SHOW_DLG };
protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
 DECLARE_MESSAGE_MAP()public: virtual BOOL OnInitDialog(); int m_nWidth; // 屏幕的宽 int m_nHeight; // 屏幕的高 CDC m_memDC; // 内存DC CRectTracker m_tracker; // 橡皮筋，也就是可以伸缩矩形框 afx_msg void OnPaint(); afx_msg void OnLButtonDown(UINT nFlags, CPoint point); afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point); // 添加快捷键 //afx_msg LRESULT OnHotKey(WPARAM wParam, LPARAM lParam); // 添加消息响应函数声明 //afx_msg void OnHotKey(UINT nHotKeyID, UINT nKey1, UINT nKey2); //virtual BOOL DestroyWindow();};

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因本人学识浅薄，文章若有存在的问题，请不吝赐教，笔者会万分感激并积极改进。

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