哎呀~~没记性~又遇到‘指针错误，无法计算值’的问题~~

Question

void CALLBACK OnD3D9FrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
    HRESULT hr;    // Clear the render target and the zbuffer 
    V( pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB( 0, 45, 50, 170 ), 1.0f, 0 ) );    // Render the scene
    if( SUCCEEDED( pd3dDevice->BeginScene() ) )
    {
//使用效果渲染场景
D3DXHANDLE hTechnique = 0;
hTechnique= g_pEffect->GetTechniqueByName("TO");
V(g_pEffect->SetTechnique( hTechnique )); UINT nPasses;
g_pEffect->Begin( &nPasses, 0 );
for( UINT iPass = 0; iPass < nPasses; iPass ++ )
{
V(g_pEffect->BeginPass( iPass )); V( g_pMesh->DrawSubset(0) ); g_pEffect->EndPass();
}

g_pEffect->End(); 
V( pd3dDevice->EndScene() );
    }
}程序一运行到 hTechnique= g_pEffect->GetTechniqueByName("TO")
就出错~~~哎~~请高手把我点醒吧！！最近不只是一次遇到这个问题了~

Answer 1

全部代码：
//--------------------------------------------------------------------------------------
// File: EmptyProject.cpp
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//--------------------------------------------------------------------------------------#include "DXUT.h"
#include "resource.h"
//全局变量
LPD3DXMESH                 g_pMesh          = NULL; //网格模型LPD3DXEFFECT               g_pEffect    = NULL;     //效果//--------------------------------------------------------------------------------------
// Rejects any D3D9 devices that aren't acceptable to the app by returning false
//--------------------------------------------------------------------------------------
bool CALLBACK IsD3D9DeviceAcceptable( D3DCAPS9* pCaps, D3DFORMAT AdapterFormat, D3DFORMAT BackBufferFormat,
                                      bool bWindowed, void* pUserContext )
{
    // Typically want to skip back buffer formats that don't support alpha blending
    IDirect3D9* pD3D = DXUTGetD3D9Object();
    if( FAILED( pD3D->CheckDeviceFormat( pCaps->AdapterOrdinal, pCaps->DeviceType,
                                         AdapterFormat, D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING,
                                         D3DRTYPE_TEXTURE, BackBufferFormat ) ) )
        return false;
//检查顶点渲染器
if( pCaps->VertexShaderVersion < D3DVS_VERSION(2,0) )
return FALSE; //检查像素渲染器
if( pCaps->PixelShaderVersion < D3DPS_VERSION(2,0) )
return FALSE;    return true;
}
//--------------------------------------------------------------------------------------
// Before a device is created, modify the device settings as needed
//--------------------------------------------------------------------------------------
bool CALLBACK ModifyDeviceSettings( DXUTDeviceSettings* pDeviceSettings, void* pUserContext )
{
return true;
}
//--------------------------------------------------------------------------------------
// Create any D3D9 resources that will live through a device reset (D3DPOOL_MANAGED)
// and aren't tied to the back buffer size
//--------------------------------------------------------------------------------------
HRESULT CALLBACK OnD3D9CreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
                                     void* pUserContext )
{ HRESULT hr; //加载茶壶
V_RETURN( D3DXLoadMeshFromX( L"teapot.x", D3DXMESH_MANAGED, pd3dDevice, 
NULL, NULL, NULL, NULL, &g_pMesh ) );
//创建效果
V_RETURN(D3DXCreateEffectFromFile( pd3dDevice, L"shader1.fx", NULL, NULL, 
D3DXSHADER_DEBUG, NULL, &g_pEffect, NULL ));
return S_OK;
}
//--------------------------------------------------------------------------------------
// Create any D3D9 resources that won't live through a device reset (D3DPOOL_DEFAULT) 
// or that are tied to the back buffer size 
//--------------------------------------------------------------------------------------
HRESULT CALLBACK OnD3D9ResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
                                    void* pUserContext )
{
HRESULT hr;
//恢复效果对象
if( g_pEffect )
V_RETURN( g_pEffect->OnResetDevice() ); //构造世界矩阵
D3DXMATRIX matWorld;
D3DXMatrixIdentity( &matWorld ); //构造观察矩阵
D3DXMATRIXA16 matView;
D3DXVECTOR3 vEyePt( 3.0f, 0.0f,3.0f );
D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f );
D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec ); //构造投影矩阵
D3DXMATRIXA16 matProj;
float fAspectRatio = (float)pBackBufferSurfaceDesc->Width / pBackBufferSurfaceDesc->Height;
D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, fAspectRatio, 1.0f, 100.0f ); //为效果设置组合变换矩阵
D3DXMATRIX mWorldViewProj = matWorld * matView * matProj;
g_pEffect->SetMatrix( "matWorldViewProj", &mWorldViewProj ); //设置剔出模式,为不剔出任何面
hr = pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE ); return S_OK;
}
//--------------------------------------------------------------------------------------
// Handle updates to the scene.  This is called regardless of which D3D API is used
//--------------------------------------------------------------------------------------
void CALLBACK OnFrameMove( double fTime, float fElapsedTime, void* pUserContext )
{ }
//--------------------------------------------------------------------------------------
// Render the scene using the D3D9 device
//--------------------------------------------------------------------------------------
void CALLBACK OnD3D9FrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
    HRESULT hr;    // Clear the render target and the zbuffer 
    V( pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB( 0, 45, 50, 170 ), 1.0f, 0 ) );    // Render the scene
    if( SUCCEEDED( pd3dDevice->BeginScene() ) )
    {
//使用效果渲染场景
D3DXHANDLE hTechnique = 0;
hTechnique= g_pEffect->GetTechniqueByName("TO");
V(g_pEffect->SetTechnique( hTechnique )); UINT nPasses;
g_pEffect->Begin( &nPasses, 0 );
for( UINT iPass = 0; iPass < nPasses; iPass ++ )
{
V(g_pEffect->BeginPass( iPass )); V( g_pMesh->DrawSubset(0) ); g_pEffect->EndPass();
}

g_pEffect->End(); 
V( pd3dDevice->EndScene() );
    }
}
//--------------------------------------------------------------------------------------
// Handle messages to the application 
//--------------------------------------------------------------------------------------
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
                          bool* pbNoFurtherProcessing, void* pUserContext )
{
    return 0;
}
//--------------------------------------------------------------------------------------
// Release D3D9 resources created in the OnD3D9ResetDevice callback 
//--------------------------------------------------------------------------------------
void CALLBACK OnD3D9LostDevice( void* pUserContext )
{
if( g_pEffect )
g_pEffect->OnLostDevice();
}
//--------------------------------------------------------------------------------------
// Release D3D9 resources created in the OnD3D9CreateDevice callback 
//--------------------------------------------------------------------------------------
void CALLBACK OnD3D9DestroyDevice( void* pUserContext )
{
SAFE_RELEASE(g_pVB);
SAFE_RELEASE(g_pMesh);
SAFE_RELEASE(g_pEffect);
}
//--------------------------------------------------------------------------------------
// Initialize everything and go into a render loop
//--------------------------------------------------------------------------------------
INT WINAPI wWinMain( HINSTANCE, HINSTANCE, LPWSTR, int )
{
    // Enable run-time memory check for debug builds.
#if defined(DEBUG) | defined(_DEBUG)
    _CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif    // Set the callback functions
    DXUTSetCallbackD3D9DeviceAcceptable( IsD3D9DeviceAcceptable );
    DXUTSetCallbackD3D9DeviceCreated( OnD3D9CreateDevice );
    DXUTSetCallbackD3D9DeviceReset( OnD3D9ResetDevice );
    DXUTSetCallbackD3D9FrameRender( OnD3D9FrameRender );
    DXUTSetCallbackD3D9DeviceLost( OnD3D9LostDevice );
    DXUTSetCallbackD3D9DeviceDestroyed( OnD3D9DestroyDevice );
    DXUTSetCallbackDeviceChanging( ModifyDeviceSettings );
    DXUTSetCallbackMsgProc( MsgProc );
    DXUTSetCallbackFrameMove( OnFrameMove );    // TODO: Perform any application-level initialization here    // Initialize DXUT and create the desired Win32 window and Direct3D device for the application
    DXUTInit( true, true ); // Parse the command line and show msgboxes
    DXUTSetHotkeyHandling( true, true, true );  // handle the default hotkeys
    DXUTSetCursorSettings( true, true ); // Show the cursor and clip it when in full screen
    DXUTCreateWindow( L"EmptyProject" );
    DXUTCreateDevice( true, 640, 480 );    // Start the render loop
    DXUTMainLoop();    // TODO: Perform any application-level cleanup here    return DXUTGetExitCode();
}

Answer 2

代码太长了！
怀疑你 g_pEffect 没有初始化！

Answer 3

我遇到个无法计算指针表达式的值，如下if(*lpSrc==0)，运行时提示出错，说是无法计算该表达式的值，请问这是为什么啊？