qt使用dxgi截图程序

我了解你的要求，我可以回答你的问题。在 Qt 中，实现 DXGI 截图可以使用 Direct2D 以及 Direct3D 来创建一个 DXGI 输出与设备，然后通过 DXGI 采样器抓取输出中的图像数据来进行截图。可以通过以下步骤来实现：

1. 创建一个 Direct3D 设备对象
2. 使用 Direct2D 在此设备的上下文中创建一个 DXGI 输出
3. 创建一个 DXGI 纹理作为输出
4. 使用 DXGI 采集器将输出图像复制到纹理中
5. 在 Qt 中使用 QWindowsContext 类创建一个 window 并获取 window 的 HWND
6. 将 DXGI 纹理绑定为 D3D9 纹理并使用 D3D9 设备对象创建 D3D9 图形界面
7. 将 D3D9 界面作为 Qt 的 QWindow 中的子窗口，然后截取该子窗口的图像即可。

希望我的回答能够帮助到你。

相关问题

qt使用dxgi截屏保存

以下是使用Qt和DXGI进行屏幕截图并保存的示例代码：

#include <QCoreApplication>
#include <QImage>
#include <QFile>
#include <QDebug>
#include <d3d11.h>
#include <dxgi1_2.h>

// Helper function to check HRESULTs
#define CHECK_HR(hr, msg) \
    if (FAILED(hr)) { \
        qDebug() << msg << "failed with HRESULT" << hr; \
        return false; \
    }

bool saveScreenshot(const QString& filePath)
{
    HRESULT hr = S_OK;

    // Create DXGI factory
    IDXGIFactory1* pFactory = nullptr;
    hr = CreateDXGIFactory1(__uuidof(IDXGIFactory1), (void**)&pFactory);
    CHECK_HR(hr, "Failed to create DXGI factory");

    // Get primary adapter
    IDXGIAdapter1* pAdapter = nullptr;
    hr = pFactory->EnumAdapters1(0, &pAdapter);
    CHECK_HR(hr, "Failed to get primary adapter");

    // Create D3D device and swap chain
    D3D_FEATURE_LEVEL featureLevel = D3D_FEATURE_LEVEL_11_0;
    D3D_FEATURE_LEVEL featureLevels[] = { featureLevel };
    DXGI_SWAP_CHAIN_DESC swapChainDesc = { 0 };
    swapChainDesc.BufferCount = 1;
    swapChainDesc.BufferDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
    swapChainDesc.OutputWindow = GetDesktopWindow();
    swapChainDesc.SampleDesc.Count = 1;
    swapChainDesc.Windowed = TRUE;
    ID3D11Device* pDevice = nullptr;
    ID3D11DeviceContext* pContext = nullptr;
    IDXGISwapChain* pSwapChain = nullptr;
    hr = D3D11CreateDeviceAndSwapChain(pAdapter, D3D_DRIVER_TYPE_UNKNOWN, NULL, 0, featureLevels, 1,
        D3D11_SDK_VERSION, &swapChainDesc, &pSwapChain, &pDevice, &featureLevel, &pContext);
    CHECK_HR(hr, "Failed to create D3D device and swap chain");

    // Get back buffer texture
    ID3D11Texture2D* pBackBuffer = nullptr;
    hr = pSwapChain->GetBuffer(0, __uuidof(ID3D11Texture2D), (LPVOID*)&pBackBuffer);
    CHECK_HR(hr, "Failed to get back buffer texture");

    // Create a CPU-readable texture
    D3D11_TEXTURE2D_DESC textureDesc = { 0 };
    textureDesc.Width = GetSystemMetrics(SM_CXSCREEN);
    textureDesc.Height = GetSystemMetrics(SM_CYSCREEN);
    textureDesc.MipLevels = 1;
    textureDesc.ArraySize = 1;
    textureDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    textureDesc.SampleDesc.Count = 1;
    textureDesc.Usage = D3D11_USAGE_STAGING;
    textureDesc.BindFlags = 0;
    textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
    ID3D11Texture2D* pTexture = nullptr;
    hr = pDevice->CreateTexture2D(&textureDesc, NULL, &pTexture);
    CHECK_HR(hr, "Failed to create CPU-readable texture");

    // Copy back buffer to CPU-readable texture
    pContext->CopyResource(pTexture, pBackBuffer);

    // Read texture data
    D3D11_MAPPED_SUBRESOURCE mappedResource;
    hr = pContext->Map(pTexture, 0, D3D11_MAP_READ, 0, &mappedResource);
    CHECK_HR(hr, "Failed to map texture");
    QImage image(mappedResource.pData, textureDesc.Width, textureDesc.Height, QImage::Format_RGB32);
    pContext->Unmap(pTexture, 0);

    // Save image to file
    if (!image.save(filePath)) {
        qDebug() << "Failed to save screenshot to" << filePath;
        return false;
    }

    // Cleanup
    pContext->Release();
    pDevice->Release();
    pSwapChain->Release();
    pAdapter->Release();
    pFactory->Release();
    pTexture->Release();
    pBackBuffer->Release();

    return true;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    if (saveScreenshot("screenshot.png")) {
        qDebug() << "Screenshot saved to screenshot.png";
    }

    return a.exec();
}

该代码使用DXGI和D3D11 API创建设备和交换链，然后获取主适配器和后缓冲器纹理。然后，它创建一个CPU可读的纹理，将后缓冲器纹理复制到该纹理中，然后将其映射到内存中以获取图像数据。最后，它使用Qt的QImage类将图像数据保存到文件中。请注意，此代码需要使用Windows SDK和DirectX SDK来构建。

C++使用DXGI截图代码

以下是使用DXGI截图的示例代码：

#include <d3d11.h>
#include <dxgi1_2.h>
#include <iostream>

int main()
{
    HRESULT hr = S_OK;

    // 创建DXGI设备
    IDXGIFactory2* pFactory = nullptr;
    hr = CreateDXGIFactory2(0, IID_PPV_ARGS(&pFactory));
    if (FAILED(hr))
    {
        std::cout << "Failed to create DXGI factory." << std::endl;
        return 1;
    }

    // 枚举第一个适配器
    IDXGIAdapter1* pAdapter = nullptr;
    hr = pFactory->EnumAdapters1(0, &pAdapter);
    if (FAILED(hr))
    {
        std::cout << "Failed to enumerate adapters." << std::endl;
        return 1;
    }

    // 创建D3D11设备和设备上下文
    ID3D11Device* pDevice = nullptr;
    ID3D11DeviceContext* pContext = nullptr;
    hr = D3D11CreateDevice(pAdapter, D3D_DRIVER_TYPE_UNKNOWN, nullptr, 0, nullptr, 0,
        D3D11_SDK_VERSION, &pDevice, nullptr, &pContext);
    if (FAILED(hr))
    {
        std::cout << "Failed to create D3D11 device and context." << std::endl;
        return 1;
    }

    // 获取DXGI设备
    IDXGIDevice1* pDXGIDevice = nullptr;
    hr = pDevice->QueryInterface(__uuidof(IDXGIDevice1), (void**)&pDXGIDevice);
    if (FAILED(hr))
    {
        std::cout << "Failed to get DXGI device." << std::endl;
        return 1;
    }

    // 获取DXGI适配器
    IDXGIAdapter* pDXGIAdapter = nullptr;
    hr = pDXGIDevice->GetParent(__uuidof(IDXGIAdapter), (void**)&pDXGIAdapter);
    if (FAILED(hr))
    {
        std::cout << "Failed to get DXGI adapter." << std::endl;
        return 1;
    }

    // 获取DXGI工厂
    IDXGIFactory* pDXGIFactory = nullptr;
    hr = pDXGIAdapter->GetParent(__uuidof(IDXGIFactory), (void**)&pDXGIFactory);
    if (FAILED(hr))
    {
        std::cout << "Failed to get DXGI factory." << std::endl;
        return 1;
    }

    // 获取前缓冲表面
    IDXGISurface* pBackBufferSurface = nullptr;
    hr = pDXGIFactory->CreateSwapChain(pDXGIDevice, &swapChainDesc, &pSwapChain);
    if (FAILED(hr))
    {
        std::cout << "Failed to create swap chain." << std::endl;
        return 1;
    }
    hr = pSwapChain->GetBuffer(0, __uuidof(IDXGISurface), (void**)&pBackBufferSurface);
    if (FAILED(hr))
    {
        std::cout << "Failed to get back buffer surface." << std::endl;
        return 1;
    }

    // 保存图像到文件
    hr = SaveSurfaceToFile(pBackBufferSurface, L"Screenshot.png");
    if (FAILED(hr))
    {
        std::cout << "Failed to save screenshot to file." << std::endl;
        return 1;
    }

    // 释放资源
    pBackBufferSurface->Release();
    pSwapChain->Release();
    pDXGIFactory->Release();
    pDXGIAdapter->Release();
    pDXGIDevice->Release();
    pContext->Release();
    pDevice->Release();
    pAdapter->Release();
    pFactory->Release();

    return 0;
}

在此示例中，我们首先使用`CreateDXGIFactory2`函数创建了一个DXGI工厂对象。然后，我们使用`EnumAdapters1`函数枚举第一个适配器，并使用`D3D11CreateDevice`函数创建了一个D3D11设备和设备上下文对象。接下来，我们使用`QueryInterface`函数获取了设备对象的`IDXGIDevice1`接口，然后使用`GetParent`函数获取了适配器对象的`IDXGIAdapter`接口，最后使用`GetParent`函数获取了工厂对象的`IDXGIFactory`接口。

然后，我们使用`CreateSwapChain`函数创建了一个交换链对象，并使用`GetBuffer`函数获取了前缓冲表面对象。最后，我们使用`SaveSurfaceToFile`函数将表面对象保存为PNG图像文件。

请注意，此示例中省略了一些错误检查和释放资源的代码。在实际应用中，应该对所有函数调用返回值进行错误检查，并在程序结束时释放所有资源。