首先是抓图服务：
ICaptureHelper.h
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#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;
};
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CaptureService.h
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#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_;
};
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其次是抓图代码封装：
AbsCaptureHelper.h
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#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_;
};
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AbsCaptureHelper.cpp
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#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();
}
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DibCaptureHelper.h
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#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_;
};
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DibCaptureHelper.cpp
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#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;
}
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PrintCaptureHelper.h
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#pragma once
#include "AbsCaptureHelper.h"
class PrintCaptureHelper : public AbsCaptureHelper
{
public:
PrintCaptureHelper();
virtual ~PrintCaptureHelper();
protected:
bool InitDC(const BITMAPINFO& bitmapInfo) override;
bool DoCapture() override;
};
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PrintCaptureHelper.cpp
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#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;
}
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以上就是c++ 封装一个截图服务的详细内容，更多关于c++ 截图的资料请关注服务器之家其它相关文章！
原文链接：https://www.cnblogs.com/xhubobo/p/12604983.html