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我刚刚开始尝试学习Direct2D和Windows，并且一直在浏览他们在MSDN上的教程。我写的大部分代码都是从他们的站点手动复制的。我在一个教程模块中介绍了用户输入，代码大部分与前一个模块相同，但是程序启动并且窗口从未完全呈现;它只是一个白色区域，包括非客户区域应呈现的位置（顶部横条，侧边和底部）。以下是main.cpp文件的代码：Direct2D窗口没有完全渲染
#ifndef UNICODE
#define UNICODE
#endif // !UNICODE
#include <windowsx.h>
#include <Windows.h>
#include <d2d1.h>
#pragma comment (lib, "d2d1")
#include "BaseWindow.h"
template <class T> void SafeRelease(T **ppT)
{
if(*ppT)
{
(*ppT)->Release();
*ppT = NULL;
}
}
class DPIScale
{
static float scaleX;
static float scaleY;
public:
static void Intitialize(ID2D1Factory *pFactory)
{
FLOAT dpiX, dpiY;
pFactory->GetDesktopDpi(&dpiX, &dpiY);
scaleX = dpiX/96.0f;
scaleY = dpiY/96.0f;
}
template <typename T>
static D2D1_POINT_2F Pixels_To_DIPs(T x, T y)
{
return D2D1::Point2F(static_cast<float>(x)/scaleX, static_cast<float>(y)
/scaleY);
}
};
float DPIScale::scaleX = 1.0F;
float DPIScale::scaleY = 1.0F;
class MainWindow : public BaseWindow<MainWindow>
{
ID2D1Factory *pFactory;
ID2D1HwndRenderTarget *pRenderTarget;
ID2D1SolidColorBrush *pBrush;
D2D1_ELLIPSE ellipse;
D2D1_POINT_2F ptMouse;
HRESULT CreateGraphicsResources();
void DiscardGraphicsResources();
void Resize();
void OnPaint();
void OnLButtonDown(int pixelX, int pixelY, DWORD flags);
void OnLButtonUp();
void OnMouseMove(int pixelX, int pixelY, DWORD flags);
public:
MainWindow() : pFactory(NULL), pRenderTarget(NULL), pBrush(NULL),
ellipse(D2D1::Ellipse(D2D1::Point2F(), 0, 0)),
ptMouse(D2D1::Point2F()) {}
PCWSTR ClassName() const { return L"D2D Drawing Program Class"; }
LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam);
};
HRESULT MainWindow::CreateGraphicsResources()
{
HRESULT hr = S_OK;
if(pRenderTarget == NULL)
{
RECT rc;
GetClientRect(m_hwnd, &rc);
D2D_SIZE_U size = D2D1::SizeU(rc.right, rc.bottom);
hr = pFactory->CreateHwndRenderTarget(
D2D1::RenderTargetProperties(),
D2D1::HwndRenderTargetProperties(m_hwnd, size),
&pRenderTarget
);
if(SUCCEEDED(hr))
{
const D2D1_COLOR_F color = D2D1::ColorF(0.0f, 0.0f, 0.0f, 1.0f);
hr = pRenderTarget->CreateSolidColorBrush(color, &pBrush);
}
}
return hr;
}
void MainWindow::DiscardGraphicsResources()
{
SafeRelease(&pRenderTarget);
SafeRelease(&pBrush);
}
void MainWindow::OnPaint()
{
HRESULT hr = CreateGraphicsResources();
if(SUCCEEDED(hr))
{
PAINTSTRUCT ps;
BeginPaint(m_hwnd, &ps);
pRenderTarget->BeginDraw();
pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
pRenderTarget->FillEllipse(ellipse, pBrush);
hr = pRenderTarget->EndDraw();
if(FAILED(hr) || hr == D2DERR_RECREATE_TARGET)
{
DiscardGraphicsResources();
}
EndPaint(m_hwnd, &ps);
}
}
void MainWindow::Resize()
{
if (pRenderTarget != NULL)
{
RECT rc;
GetClientRect(m_hwnd, &rc);
D2D1_SIZE_U size = D2D1::SizeU(rc.right, rc.bottom);
pRenderTarget->Resize(size);
InvalidateRect(m_hwnd, NULL, FALSE);
}
}
void MainWindow::OnLButtonDown(int pixelX, int pixelY, DWORD flags)
{
SetCapture(m_hwnd);
ellipse.point = ptMouse = DPIScale::Pixels_To_DIPs(pixelX, pixelY);
ellipse.radiusX = ellipse.radiusY = 1.0f;
InvalidateRect(m_hwnd, NULL, FALSE);
}
void MainWindow::OnLButtonUp()
{
ReleaseCapture();
}
void MainWindow::OnMouseMove(int pixelX, int pixelY, DWORD flags)
{
const D2D1_POINT_2F DIPs = DPIScale::Pixels_To_DIPs(pixelX, pixelY);
const float width = (DIPs.x - ptMouse.x)/2;
const float height = (DIPs.y - ptMouse.y)/2;
const float x1 = ptMouse.x + width;
const float y1 = ptMouse.y + height;
ellipse = D2D1::Ellipse(D2D1::Point2F(x1, y1), width, height);
InvalidateRect(m_hwnd, NULL, FALSE);
}
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR, int nCmdShow)
{
MainWindow win;
if(!win.Create(L"D2D Drawing Program", WS_OVERLAPPEDWINDOW))
{
return 0;
}
ShowWindow(win.Window(), nCmdShow);
MSG msg = {};
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT MainWindow::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch(uMsg)
{
case WM_CREATE:
if(FAILED(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
&pFactory)))
{
return -1;
}
// DPIScale::Intitialize(pFactory);
return 0;
case WM_DESTROY:
DiscardGraphicsResources();
SafeRelease(&pFactory);
PostQuitMessage(0);
return 0;
case WM_PAINT:
OnPaint();
return 0;
case WM_SIZE:
Resize();
return 0;
case WM_LBUTTONDOWN:
OnLButtonDown(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam),
(DWORD)wParam);
return 0;
case WM_LBUTTONUP:
OnLButtonUp();
return 0;
case WM_MOUSEMOVE:
OnMouseMove(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam
(DWORD)wParam);
return 0;
}
}
如果可以，请帮助！我已经过了一个半小时，并且找不到任何不一致的地方。
有一个BaseWindow模板类包含在一个头文件中，该代码用来创建和注册窗口类以及所有这些，但头文件是来自另一个程序的直接拷贝，工作正常，所以我没有认为它需要包括在内。