C++抓图服务
2020-03-31 16:02:46来源:博客园 阅读 ()
C++抓图服务
基于前两篇抓图文章,本文将抓图提取为一个服务,实现不同场景下抓图需求的封装。
C++使用BitBlt进行窗口抓图
C++使用PrintWindow进行窗口抓图
首先是抓图服务:
ICaptureHelper.h
#pragma once #include <windows.h> #include <string> using std::string; class ICaptureHelper { public: virtual ~ICaptureHelper() {} virtual bool Init(const string& windowName) = 0; virtual bool Init(HWND hwnd) = 0; virtual void Cleanup() = 0; virtual bool RefreshWindow() = 0; virtual bool ChangeWindowHandle(const string& windowName) = 0; virtual bool ChangeWindowHandle(HWND hwnd) = 0; virtual bool Capture() = 0; virtual const RECT& GetWindowRect() const = 0; virtual const RECT& GetClientRect() const = 0; virtual int GetBitmapDataSize() const = 0; virtual HBITMAP GetBitmap() const = 0; virtual void* GetBitmapAddress() const = 0; };
CaptureService.h
#pragma once #include "ICaptureHelper.h" #include <map> using std::map; class CaptureService { public: CaptureService() = default; static CaptureService& GetInstance(); enum CaptureType { //使用CreateDIBSection抓图,速度快,但是无法抓取D3D等渲染的窗口 CreateDibSection = 0, //使用PrintWindow抓图,速度慢(16ms左右),但是可以抓取D3D等渲染的窗口 PrintWindow }; bool RegisterCapture(string name, string windowName, CaptureType type = CreateDibSection); //注册抓图服务 bool RegisterCapture(string name, HWND hwnd, CaptureType type = CreateDibSection); //注册抓图服务 void UnRegisterCapture(string name); //注销抓图服务 bool IsRegister(string name); //获取是否已注册抓图服务 bool RefreshWindow(string name); //刷新窗口 bool ChangeWindowHandle(string name, string windowName); //修改窗口句柄 bool ChangeWindowHandle(string name, HWND hwnd); //修改窗口句柄 bool Capture(string name); //抓图 bool GetWindowRect(string name, RECT& winRect); //获取窗口尺寸 bool GetClientRect(string name, RECT& clientRect); //获取窗口客户区尺寸 bool GetBitmapDataSize(string name, int& bmpDataSize); //获取抓图数据大小 bool GetBitmap(string name, HBITMAP& bitmap); //获取窗口位图 bool GetBitmapAddress(string name, void** bitsPtr); //获取窗口位图地址 void Cleanup(); //清理所有抓图服务 private: ~CaptureService(); private: map<string, ICaptureHelper*> captureHelpers_; };
CaptureService.cpp
#include "stdafx.h" #include "CaptureService.h" #include "DibCaptureHelper.h" #include "PrintCaptureHelper.h" CaptureService::~CaptureService() { Cleanup(); } CaptureService& CaptureService::GetInstance() { static CaptureService instance; return instance; } bool CaptureService::RegisterCapture(string name, string windowName, CaptureType type /* = CreateDibSection */) { const auto hwnd = ::FindWindowA(nullptr, windowName.c_str()); return RegisterCapture(name, hwnd, type); } bool CaptureService::RegisterCapture(string name, HWND hwnd, CaptureType type /* = CreateDibSection */) { if (name.empty() || captureHelpers_.find(name) != captureHelpers_.end()) { return false; } ICaptureHelper* helper; switch (type) { case CreateDibSection: helper = new DibCaptureHelper(); break; case PrintWindow: helper = new PrintCaptureHelper(); break; default: return false; } if (helper == nullptr) { return false; } if (!helper->Init(hwnd)) { delete helper; return false; } captureHelpers_[name] = helper; return true; } void CaptureService::UnRegisterCapture(string name) { if (name.empty() || captureHelpers_.find(name) == captureHelpers_.end()) { return; } auto* captureHelper = captureHelpers_[name]; if (captureHelper != nullptr) { captureHelper->Cleanup(); delete captureHelper; } captureHelpers_.erase(name); } bool CaptureService::IsRegister(string name) { return !name.empty() && captureHelpers_.find(name) != captureHelpers_.end(); } bool CaptureService::RefreshWindow(string name) { if (!IsRegister(name)) { return false; } return captureHelpers_[name]->RefreshWindow(); } bool CaptureService::ChangeWindowHandle(string name, string windowName) { if (!IsRegister(name)) { return false; } return captureHelpers_[name]->ChangeWindowHandle(windowName); } bool CaptureService::ChangeWindowHandle(string name, HWND hwnd) { if (!IsRegister(name)) { return false; } return captureHelpers_[name]->ChangeWindowHandle(hwnd); } bool CaptureService::Capture(string name) { if (!IsRegister(name)) { return false; } return captureHelpers_[name]->Capture(); } bool CaptureService::GetWindowRect(string name, RECT& winRect) { if (!IsRegister(name)) { return false; } winRect = captureHelpers_[name]->GetWindowRect(); return true; } bool CaptureService::GetClientRect(string name, RECT& clientRect) { if (!IsRegister(name)) { return false; } clientRect = captureHelpers_[name]->GetClientRect(); return true; } bool CaptureService::GetBitmapDataSize(string name, int& bmpDataSize) { if (!IsRegister(name)) { return false; } bmpDataSize = captureHelpers_[name]->GetBitmapDataSize(); return true; } bool CaptureService::GetBitmap(string name, HBITMAP& bitmap) { if (!IsRegister(name)) { return false; } bitmap = captureHelpers_[name]->GetBitmap(); return true; } bool CaptureService::GetBitmapAddress(string name, void** bitsPtr) { if (!IsRegister(name)) { return false; } *bitsPtr = captureHelpers_[name]->GetBitmapAddress(); return true; } void CaptureService::Cleanup() { for (auto iter = captureHelpers_.cbegin(); iter != captureHelpers_.cend(); ++iter) { auto* captureHelper = iter->second; if (captureHelper != nullptr) { captureHelper->Cleanup(); delete captureHelper; } } captureHelpers_.clear(); }
其次是抓图代码封装:
AbsCaptureHelper.h
#pragma once #include "ICaptureHelper.h" class AbsCaptureHelper : public ICaptureHelper { public: AbsCaptureHelper(); virtual ~AbsCaptureHelper(); bool Init(const string& windowName) override; bool Init(HWND hwnd) override; void Cleanup() override; bool RefreshWindow() override; bool ChangeWindowHandle(const string& windowName) override; bool ChangeWindowHandle(HWND hwnd) override; bool Capture() override; const RECT& GetWindowRect() const override { return windowRect_; } const RECT& GetClientRect() const override { return clientRect_; } int GetBitmapDataSize() const override { return bmpDataSize_; } HBITMAP GetBitmap() const override { return bitmap_; } void* GetBitmapAddress() const override { return bitsPtr_; } protected: virtual bool InitDC(const BITMAPINFO& bitmapInfo) = 0; virtual bool DoCapture() = 0; protected: HWND hwnd_; HDC scrDc_; HDC memDc_; HBITMAP bitmap_; HBITMAP oldBitmap_; void* bitsPtr_; RECT windowRect_; RECT clientRect_; int bmpDataSize_; };
AbsCaptureHelper.cpp
#include "stdafx.h" #include "AbsCaptureHelper.h" AbsCaptureHelper::AbsCaptureHelper() : hwnd_(nullptr) , scrDc_(nullptr) , memDc_(nullptr) , bitmap_(nullptr) , oldBitmap_(nullptr) , bitsPtr_(nullptr) , windowRect_{ 0, 0, 0, 0 } , clientRect_{ 0, 0, 0, 0 } , bmpDataSize_(0) { } AbsCaptureHelper::~AbsCaptureHelper() { AbsCaptureHelper::Cleanup(); } bool AbsCaptureHelper::Init(const string& windowName) { const auto handle = ::FindWindowA(nullptr, windowName.c_str()); if (handle == nullptr) { return false; } return Init(handle); } bool AbsCaptureHelper::Init(HWND hwnd) { hwnd_ = hwnd; //获取窗口大小 if (!::GetWindowRect(hwnd_, &windowRect_) || !::GetClientRect(hwnd_, &clientRect_)) { return false; } const auto clientRectWidth = clientRect_.right - clientRect_.left; const auto clientRectHeight = clientRect_.bottom - clientRect_.top; bmpDataSize_ = clientRectWidth * clientRectHeight * 4; //位图信息 BITMAPINFO bitmapInfo; bitmapInfo.bmiHeader.biSize = sizeof(bitmapInfo); bitmapInfo.bmiHeader.biWidth = clientRectWidth; bitmapInfo.bmiHeader.biHeight = clientRectHeight; bitmapInfo.bmiHeader.biPlanes = 1; bitmapInfo.bmiHeader.biBitCount = 32; bitmapInfo.bmiHeader.biSizeImage = clientRectWidth * clientRectHeight; bitmapInfo.bmiHeader.biCompression = BI_RGB; return InitDC(bitmapInfo); } void AbsCaptureHelper::Cleanup() { if (bitmap_ == nullptr) { return; } //删除用过的对象 ::SelectObject(memDc_, oldBitmap_); ::DeleteObject(bitmap_); ::DeleteDC(memDc_); ::ReleaseDC(hwnd_, scrDc_); hwnd_ = nullptr; scrDc_ = nullptr; memDc_ = nullptr; bitmap_ = nullptr; oldBitmap_ = nullptr; bitsPtr_ = nullptr; } bool AbsCaptureHelper::RefreshWindow() { const auto hwnd = hwnd_; Cleanup(); return Init(hwnd); } bool AbsCaptureHelper::ChangeWindowHandle(const string& windowName) { Cleanup(); return Init(windowName); } bool AbsCaptureHelper::ChangeWindowHandle(HWND hwnd) { Cleanup(); return Init(hwnd); } bool AbsCaptureHelper::Capture() { if (bitmap_ == nullptr || memDc_ == nullptr || scrDc_ == nullptr) { return false; } return DoCapture(); }
DibCaptureHelper.h
#pragma once #include "AbsCaptureHelper.h" class DibCaptureHelper : public AbsCaptureHelper { public: DibCaptureHelper(); virtual ~DibCaptureHelper(); protected: bool InitDC(const BITMAPINFO& bitmapInfo) override; bool DoCapture() override; private: bool saveBitmap_; int mockPageNumber; int bmpCount_; };
DibCaptureHelper.cpp
#include "stdafx.h" #include "DibCaptureHelper.h" #include <sstream> static int BmpCount = 0; static int BmpMaxCount = 50; DibCaptureHelper::DibCaptureHelper() : saveBitmap_(false) , mockPageNumber(++BmpCount) , bmpCount_(0) { } DibCaptureHelper::~DibCaptureHelper() { } bool DibCaptureHelper::InitDC(const BITMAPINFO& bitmapInfo) { scrDc_ = ::GetWindowDC(hwnd_); memDc_ = ::CreateCompatibleDC(scrDc_); bitmap_ = ::CreateDIBSection(memDc_, &bitmapInfo, DIB_RGB_COLORS, &bitsPtr_, nullptr, 0); if (bitmap_ == nullptr) { ::DeleteDC(memDc_); ::ReleaseDC(hwnd_, scrDc_); return false; } oldBitmap_ = static_cast<HBITMAP>(::SelectObject(memDc_, bitmap_)); return true; } bool DibCaptureHelper::DoCapture() { const auto clientRectWidth = clientRect_.right - clientRect_.left; const auto clientRectHeight = clientRect_.bottom - clientRect_.top; const auto ret = ::BitBlt( memDc_, 0, 0, clientRectWidth, clientRectHeight, scrDc_, 0, 0, SRCCOPY); return ret != 0; }
PrintCaptureHelper.h
#pragma once #include "AbsCaptureHelper.h" class PrintCaptureHelper : public AbsCaptureHelper { public: PrintCaptureHelper(); virtual ~PrintCaptureHelper(); protected: bool InitDC(const BITMAPINFO& bitmapInfo) override; bool DoCapture() override; };
PrintCaptureHelper.cpp
#include "stdafx.h" #include "PrintCaptureHelper.h" PrintCaptureHelper::PrintCaptureHelper() { } PrintCaptureHelper::~PrintCaptureHelper() { } bool PrintCaptureHelper::InitDC(const BITMAPINFO& bitmapInfo) { scrDc_ = ::GetWindowDC(hwnd_); memDc_ = ::CreateCompatibleDC(scrDc_); bitmap_ = ::CreateDIBSection(scrDc_, &bitmapInfo, DIB_RGB_COLORS, &bitsPtr_, nullptr, 0); if (bitmap_ == nullptr) { ::DeleteDC(memDc_); ::ReleaseDC(hwnd_, scrDc_); return false; } oldBitmap_ = static_cast<HBITMAP>(::SelectObject(memDc_, bitmap_)); return true; } bool PrintCaptureHelper::DoCapture() { const auto ret = ::PrintWindow(hwnd_, memDc_, PW_CLIENTONLY | PW_RENDERFULLCONTENT); return ret != 0; }
原文链接:https://www.cnblogs.com/xhubobo/p/12604983.html
如有疑问请与原作者联系
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