c++ - DXGI 文本输出轨迹

Question

我正在尝试通过 TextOut 移动文本

这是代码

IDXGISurface1* g_pSurface1 = NULL;
HRESULT hr = pSwapChain->GetBuffer(0, __uuidof(IDXGISurface1), (void**)&g_pSurface1);

if (SUCCEEDED(hr))
{
    hr = g_pSurface1->GetDC(FALSE, &hdc);
    if (SUCCEEDED(hr))
    {


        TextOut(hdc, pos.x, pos.y, L"DXGI's GDI text output works", strlen("DXGI's GDI text output works") + 1);

        g_pSurface1->ReleaseDC(NULL);
    }
    else
    {
        MessageBox(0,0,0,0);
    }
    g_pSurface1->Release();
}
else
{
    MessageBox(0,0,0,0);
}
pDevContext->OMSetRenderTargets(1, &pRenderTarget, pDepth);

在哪里

 pos.x and pos.y are mouse coordinates

当我移动文本或子窗口时 GDI and DirectX rendering

我有这个

Answer 1

strlen 用于 ANSI，不能与 Unicode 混合。而是使用“wide-c-string”函数 wcsxxx。例如wcslen:

const wchar_t* text = L"DXGI's GDI text output works";
TextOut(hdc, pos.x, pos.y, text, wcslen(text));

要去除痕迹，您必须手动删除背景。例如:

case WM_MOUSEMOVE:
{
    HDC hdc = GetDC(hWnd);

    //erase background:
    RECT rc;
    GetClientRect(hWnd, &rc);
    HBRUSH brush = CreateSolidBrush(RGB(128, 128, 255));
    FillRect(hdc, &rc, brush);
    DeleteObject(brush);

    //draw text:
    const wchar_t *text = L"DXGI's GDI text output works";
    SetBkMode(hdc, OPAQUE);
    SetBkColor(hdc, RGB(255,255,255));
    TextOut(hdc, LOWORD(lParam), HIWORD(lParam), text, wcslen(text));
    ReleaseDC(hWnd, hdc);
    break;
}

编辑，将其与 Direct3D 混合

case WM_MOUSEMOVE:
{
    //call directx rendering to reset the background:
    Render(); 

    //draw text:
    HDC hdc = GetDC(hWnd);
    const wchar_t *text = L"DXGI's GDI text output works";
    SetBkMode(hdc, OPAQUE);
    SetBkColor(hdc, RGB(255,255,255));
    TextOut(hdc, LOWORD(lParam), HIWORD(lParam), text, wcslen(text));
    ReleaseDC(hWnd, hdc);
    break;
}