Visual studio 2010 CreateBitmapFromWicBitmap访问冲突

我的问题是： 我正在做一个测试项目，它初始化Direct2D来绘制一些东西

现在，我需要创建BMP背景，所以我在MSDN站点上查看了一些加载BMP以与Direct2D一起使用的教程。经过一些编码和调试，我发现了唯一一个我不能完全理解的问题，我被困在这里了。问题很简单：我在这一行遇到访问冲突： pRenderTarget->CreateBitmapFromWicBitmap pConverter，NULL，ppBitmap； 我修复了所有可能发现的问题，并测试了每个HRESULT

下面是background.cpp的完整代码： `

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下面是父类Render.cpp 我管理类继承的方式与这个问题之间没有联系——我试图创建一个只包含一个类（包括render和background）的新项目

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从您声明的双“pp”I asume；作为D2D1Bitmap**，也是因为您将其作为值传递给CreateBitmapFromWicBitmap

如果正确，您的解决方案很简单：声明一个ptrP*，而不是ptrpp**

在您的示例中，您将其声明为null ptr，并将其传递给一个函数，该函数采用指向指针的地址，导致函数读取0x000000，从而导致访问冲突

#include "Background.h"
using namespace D2D1;
Background::Background()
{
    pIWICFactory = nullptr;
    pDecoder = nullptr;
    pSource = nullptr;
    pStream = nullptr;
    pConverter = nullptr;
    ppBitmap = nullptr;
    destinationWidth = 0;
    destinationHeight = 0;
    file_path = L"Background.bmp";
}
bool Background::init(HWND hwnd)
{
    CoInitializeEx(0, COINIT_MULTITHREADED);
    CoCreateInstance( CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pIWICFactory));
    pIWICFactory->CreateDecoderFromFilename(file_path, NULL, GENERIC_READ, WICDecodeMetadataCacheOnLoad, &pDecoder);
    pIWICFactory->CreateStream(&pStream);
    pStream->InitializeFromFilename(file_path, GENERIC_READ);
    pDecoder->Initialize(pStream,WICDecodeMetadataCacheOnLoad);
    pDecoder->GetFrame(0, &pSource);
    pIWICFactory->CreateFormatConverter(&pConverter);
    pConverter->Initialize(pSource, GUID_WICPixelFormat32bppPBGRA, WICBitmapDitherTypeNone, NULL, 0.f, WICBitmapPaletteTypeMedianCut);
    pRenderTarget->CreateBitmapFromWicBitmap( pConverter, NULL, ppBitmap);
    return true;
}
Background::~Background()
{
    CoUninitialize();
    pIWICFactory->Release();
    pDecoder->Release();
    pSource->Release();
    pStream->Release();
    pConverter->Release();
    CoUninitialize();
}

#include "Render.h"
using namespace D2D1;
Render::Render()
{
    pD2DFactory = nullptr;
    pRenderTarget = nullptr;
    pGreenBrush = nullptr;
}

bool Render::Init(HWND hwnd)
{
    HRESULT hr = D2D1CreateFactory( D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory );
    RECT rc;
    GetClientRect(hwnd, &rc);
    hr = pD2DFactory->CreateHwndRenderTarget(RenderTargetProperties(), HwndRenderTargetProperties(hwnd, SizeU( rc.right - rc.left, rc.bottom - rc.top)),&pRenderTarget);
    if (SUCCEEDED(hr))          
      pRenderTarget->CreateSolidColorBrush(ColorF(ColorF::Green), &pGreenBrush ); 
    else
      return false;
    return true;
}

bool Render::Draw(HWND hwnd)
{
    RECT rc;
    GetClientRect(hwnd, &rc);

    pRenderTarget->BeginDraw();

    pRenderTarget->FillRectangle(
        RectF(
            rc.left + 500.0f,
            rc.top + 250.0f,
            rc.right - 500.0f,
            rc.bottom - 500.0f),
            pGreenBrush);   

    HRESULT hr = pRenderTarget->EndDraw();  

    if (SUCCEEDED(hr))
        return true;
    else
        return false;
}
void Render::ShutDown()
{
    if (pD2DFactory)
        pD2DFactory->Release();
    if (pRenderTarget)
        pRenderTarget->Release();
    if (pGreenBrush)
        pGreenBrush->Release();
}

// in class declaration or c'tor(?)
D2D1Bitmap* pBitmap = nullptr;      // instead of D2D1Bitmap**

/// at the point of creation
D2D1wndTarget->CreateBitmapFromWicBitmap(<yourConverter>, NULL, &pBitmap);