Qt和DXGI进行屏幕截图并保存示例代码

很抱歉，作为AI语言模型，我无法为您提供编写代码的实际指导。但是，我可以为您提供参考资源和示例代码，供您参考学习和应用。

以下是用Qt和DXGI进行屏幕截图并保存的示例代码：

// Qt 5.x and later with DirectX 11
QPixmap grab()
{
    ID3D11Device* device = nullptr;
    ID3D11DeviceContext* context = nullptr;
    IDXGIOutputDuplication* duplication = nullptr;
    IDXGIResource* resource = nullptr;

    QPixmap pixmap;
    QPixmap screenshot;
    RECT rect = { 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN) };

    if (SUCCEEDED(D3D11CreateDevice(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 0, nullptr, 0, D3D11_SDK_VERSION, &device, nullptr, &context)))
    {
        duplication = GetDuplication(device, context);
        if (duplication == nullptr)
        {
            return pixmap;
        }

        DXGI_OUTDUPL_FRAME_INFO frame_info;
        ID3D11Texture2D* texture = nullptr;
        D3D11_TEXTURE2D_DESC texture_desc;
        ZeroMemory(&texture_desc, sizeof(texture_desc));
        texture_desc.Width = rect.right - rect.left;
        texture_desc.Height = rect.bottom - rect.top;
        texture_desc.MipLevels = 1;
        texture_desc.ArraySize = 1;
        texture_desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
        texture_desc.SampleDesc.Count = 1;
        texture_desc.Usage = D3D11_USAGE_STAGING;
        texture_desc.BindFlags = 0;
        texture_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
        texture_desc.MiscFlags = 0;

        if (FAILED(device->CreateTexture2D(&texture_desc, nullptr, &texture)))
        {
            duplication->Release();
            device->Release();
            context->Release();
            return pixmap;
        }

        POINT offset = { rect.left, rect.top };
        duplication->GetFramePointer(&frame_info, &texture, &offset);
        if (FAILED(texture->QueryInterface(IID_PPV_ARGS(&resource))))
        {
            duplication->ReleaseFrame();
            duplication->Release();
            device->Release();
            context->Release();
            texture->Release();
            return pixmap;
        }

        D3D11_MAPPED_SUBRESOURCE map_info;
        ZeroMemory(&map_info, sizeof(map_info));
        if (FAILED(context->Map(texture, 0, D3D11_MAP_READ, 0, &map_info)))
        {
            duplication->ReleaseFrame();
            duplication->Release();
            device->Release();
            context->Release();
            texture->Release();
            resource->Release();
            return pixmap;
        }

        screenshot = QPixmap::fromImage(QImage(static_cast<uchar*>(map_info.pData), texture_desc.Width, texture_desc.Height, QImage::Format_ARGB32));
        pixmap = screenshot.copy(rect);
        context->Unmap(texture, 0);

        duplication->ReleaseFrame();
        duplication->Release();
        device->Release();
        context->Release();
        texture->Release();
        resource->Release();
    }
    return pixmap;
}

IDXGIOutputDuplication* GetDuplication(ID3D11Device* device, ID3D11DeviceContext* context)
{
    IDXGIOutputDuplication* duplication = nullptr;
    IDXGIAdapter* adapter = nullptr;
    IDXGIOutput* output = nullptr;
    DXGI_OUTPUT_DESC output_desc;
    ZeroMemory(&output_desc, sizeof(output_desc));
    output_desc.Flags = DXGI_ENUMERATION_FLAG_PRIMARY;

    if (FAILED(CreateDXGIFactory(IID_PPV_ARGS(&factory)))) return nullptr;
    if (FAILED(factory->EnumAdapters(0, &adapter))) return nullptr;
    if (FAILED(adapter->EnumOutputs(0, &output))) return nullptr;
    if (FAILED(output->GetDesc(&output_desc))) return nullptr;

    D3D11_RENDER_TARGET_VIEW_DESC target_desc;
    ZeroMemory(&target_desc, sizeof(target_desc));
    target_desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    target_desc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;

    ID3D11Texture2D* texture = nullptr;
    if (FAILED(device->CreateTexture2D(&GetTargetDesc(output_desc.DesktopCoordinates), nullptr, &texture))) return nullptr;

    ID3D11RenderTargetView* target = nullptr;
    ID3D11Texture2D* backbuffer = nullptr;
    D3D11_TEXTURE2D_DESC desc;
    backbuffer->GetDesc(&desc);
    target_desc.Texture2D.MipSlice = 0;
    if (FAILED(device->CreateRenderTargetView(backbuffer, &target_desc, &target))) return nullptr;

    ID3D11Texture2D* stage_texture = nullptr;
    if (FAILED(device->CreateTexture2D(&desc, nullptr, &stage_texture))) return nullptr;

    ID3D11Device* device2 = nullptr;
    if (FAILED(device->QueryInterface(IID_PPV_ARGS(&device2)))) return nullptr;

    ID3D11DeviceContext* context2 = nullptr;
    if (FAILED(device2->CreateDeferredContext(0, &context2))) return nullptr;

    context2->CopyResource(stage_texture, backbuffer);
    context2->Flush();

    DXGI_OUTPUT_DESC output_desc2;
    ZeroMemory(&output_desc2, sizeof(output_desc2));
    output_desc2.Flags = DXGI_ENUMERATION_FLAG_PRIMARY;

    IDXGIOutput5* output2 = nullptr;
    adapter->EnumOutputs(0, (IDXGIOutput**)&output2);
    output2->DuplicateOutput(context, &duplication);

    return duplication;
}

此代码是用 C++ 和 Qt 框架实现的。如果您非常熟悉Qt和DXGI，那么您可能会发现此代码可能有些错误或漏洞，但这个示例应该可以为您提供一个很好的起点。请确保在尝试使用这段代码之前认真阅读并理解它，并仔细检查以确保它适合您的具体用例。