【发布时间】：2012-01-05 23:20:35
【问题描述】：
我正在编写一个 C++ DLL，它会在它的一个函数中加载另一个 DLL。但是，当我尝试运行它时，它会在我第一次声明我的 HMODULE 变量时崩溃，甚至在我尝试调用 LoadLibrary 之前。
具体来说，我的代码是：
HMODULE my_hmod;
my_hmod = LoadLibrary("C:\\path_to_dll");
它在这两行之间崩溃（我已经通过它并注意到它在“ostream”中崩溃，如果这有帮助的话）。
例外情况如下：
PixelMotionBlur.exe 中 0x00a7392d (d3d9.dll) 处的未处理异常：0xC0000005：访问冲突读取位置 0x00000000。
任何帮助将不胜感激！如果需要，我会发布更多代码/调试信息。
编辑：这是实际的功能代码：
D3D9Wrapper::IDirect3D9* WINAPI Direct3DCreate9(UINT Version)
{
InitializeDLL();
HMODULE hD3D;
if(IsWow64())
{
hD3D = LoadLibrary("C:\\Windows\\SysWOW64\\d3d9.dll");
}
else
{
hD3D = LoadLibrary(g_Globals.RealD3D9DLL.CString());
}
if( hD3D == NULL )
{
g_Globals.ErrorFile() << "LoadLibrary on d3d9.dll failed\n";
return NULL;
}
D3D9Wrapper::D3DCREATE pCreate = (D3D9Wrapper::D3DCREATE)GetProcAddress(hD3D, _T("Direct3DCreate9"));
if( pCreate == NULL )
{
g_Globals.ErrorFile() << "coud not find Direct3DCreate9 in d3d9.dll\n";
return NULL;
}
D3D9Base::LPDIRECT3D9 pD3D = pCreate(D3D_SDK_VERSION);
if( pD3D == NULL )
{
return NULL;
}
//return (D3D9Wrapper::IDirect3D9*)pD3D;
return D3D9Wrapper::IDirect3D9::GetDirect3D(pD3D);
}
如果有帮助，这个 DLL 的功能（大部分实际上不是我的代码，而是在获得许可的情况下使用）是通过在目标 .exe 的文件夹中放置一个也名为 d3d9 的新 dll 来挂钩对 d3d9.dll 的所有调用（现在我正在使用 Direct X 9 sdk 中的示例 .exe 对其进行测试）。
编辑 2：这是函数的完整反汇编：
D3D9Wrapper::IDirect3D9* WINAPI Direct3DCreate9(UINT Version)
{
008B6960 push ebp
008B6961 mov ebp,esp
008B6963 and esp,0FFFFFFF8h
008B6966 sub esp,8
InitializeDLL();
008B6969 cmp byte ptr [g_Globals (8CAC40h)],0
008B6970 push esi
008B6971 push edi
008B6972 jne Direct3DCreate9+48h (8B69A8h)
008B6974 mov edi,offset g_Globals (8CAC40h)
008B6979 call Globals::Init (8B6A80h)
008B697E mov eax,dword ptr [g_Globals+34h (8CAC74h)]
008B6983 push 8C0D98h
008B6988 push eax
008B6989 call std::operator<<<std::char_traits<char> > (8938F0h)
008B698E call dword ptr [__imp_D3D9CallbackInitialize (8B81A4h)]
008B6994 mov ecx,dword ptr [g_Globals+34h (8CAC74h)]
008B699A push 8C0DB0h
008B699F push ecx
008B69A0 call std::operator<<<std::char_traits<char> > (8938F0h)
008B69A5 add esp,10h
HMODULE hD3D;
if(IsWow64())
008B69A8 push 8C0E60h
008B69AD push 8C0E70h
008B69B2 mov dword ptr [esp+14h],0
008B69BA call dword ptr [__imp__GetModuleHandleA@4 (8B80D0h)]
008B69C0 mov edi,dword ptr [__imp__GetProcAddress@8 (8B80C4h)]
008B69C6 push eax
008B69C7 call edi
008B69C9 mov esi,eax
008B69CB test esi,esi
008B69CD je Direct3DCreate9+94h (8B69F4h)
008B69CF lea edx,[esp+0Ch]
008B69D3 push edx
008B69D4 call dword ptr [__imp__GetCurrentProcess@0 (8B80B8h)]
008B69DA push eax
008B69DB call esi
008B69DD test eax,eax
008B69DF jne Direct3DCreate9+94h (8B69F4h)
008B69E1 mov eax,dword ptr [g_Globals+3Ch (8CAC7Ch)]
008B69E6 push 8C0E7Ch
008B69EB push eax
008B69EC call std::operator<<<std::char_traits<char> > (8938F0h)
008B69F1 add esp,8
008B69F4 cmp dword ptr [esp+0Ch],0
008B69F9 je Direct3DCreate9+0A2h (8B6A02h)
{
hD3D = LoadLibrary("C:\\Windows\\SysWOW64\\d3d9.dll");
008B69FB push 8C0E98h
}
else
008B6A00 jmp Direct3DCreate9+0B1h (8B6A11h)
{
hD3D = LoadLibrary(g_Globals.RealD3D9DLL.CString());
008B6A02 mov eax,dword ptr [g_Globals+1Ch (8CAC5Ch)]
008B6A07 test eax,eax
008B6A09 jne Direct3DCreate9+0B0h (8B6A10h)
008B6A0B mov eax,offset g_Globals+1Ch (8CAC5Ch)
008B6A10 push eax
008B6A11 call dword ptr [__imp__LoadLibraryA@4 (8B80CCh)]
}
if( hD3D == NULL )
008B6A17 test eax,eax
008B6A19 jne Direct3DCreate9+0D9h (8B6A39h)
{
g_Globals.ErrorFile() << "LoadLibrary on d3d9.dll failed\n";
008B6A1B mov ecx,dword ptr [g_Globals+3Ch (8CAC7Ch)]
008B6A21 push 8C0EB8h
008B6A26 push ecx
008B6A27 call std::operator<<<std::char_traits<char> > (8938F0h)
008B6A2C add esp,8
return NULL;
008B6A2F xor eax,eax
}
008B6A31 pop edi
008B6A32 pop esi
008B6A33 mov esp,ebp
008B6A35 pop ebp
008B6A36 ret 4
}
D3D9Wrapper::D3DCREATE pCreate = (D3D9Wrapper::D3DCREATE)GetProcAddress(hD3D, _T("Direct3DCreate9"));
008B6A39 push 8C0ED8h
008B6A3E push eax
008B6A3F call edi
if( pCreate == NULL )
008B6A41 test eax,eax
008B6A43 jne Direct3DCreate9+103h (8B6A63h)
{
g_Globals.ErrorFile() << "coud not find Direct3DCreate9 in d3d9.dll\n";
008B6A45 mov edx,dword ptr [g_Globals+3Ch (8CAC7Ch)]
008B6A4B push 8C0EE8h
008B6A50 push edx
008B6A51 call std::operator<<<std::char_traits<char> > (8938F0h)
008B6A56 add esp,8
return NULL;
008B6A59 xor eax,eax
}
008B6A5B pop edi
008B6A5C pop esi
008B6A5D mov esp,ebp
008B6A5F pop ebp
008B6A60 ret 4
}
编辑 3： 引发异常时的调用堆栈：
> d3d9.dll!std::operator<<<std::char_traits<char> >(std::basic_ostream<char,std::char_traits<char> > & _Ostr, const char * _Val) Line 773 + 0x3 bytes C++
d3d9.dll!InitializeDLL() Line 70 + 0x15 bytes C++
d3d9.dll!Direct3DCreate9(unsigned int Version) Line 141 C++
PixelMotionBlur.exe!DXUT_Dynamic_Direct3DCreate9(unsigned int SDKVersion) Line 714 + 0xc bytes C++
PixelMotionBlur.exe!DXUTDelayLoadD3D9() Line 2706 + 0xa bytes C++
PixelMotionBlur.exe!DXUTGetD3D9Object() Line 712 + 0x23 bytes C++
PixelMotionBlur.exe!CD3D9Enumeration::Enumerate(bool (_D3DCAPS9 *, _D3DFORMAT, _D3DFORMAT, bool, void *)* IsD3D9DeviceAcceptableFunc, void * pIsD3D9DeviceAcceptableFuncUserContext) Line 309 + 0x5 bytes C++
PixelMotionBlur.exe!DXUTGetD3D9Enumeration(bool bForceEnumerate) Line 255 C++
PixelMotionBlur.exe!DXUTFindValidDeviceSettings(DXUTDeviceSettings * pOut, DXUTDeviceSettings * pIn, DXUTMatchOptions * pMatchOptions) Line 174 C++
PixelMotionBlur.exe!DXUTCreateDevice(bool bWindowed, int nSuggestedWidth, int nSuggestedHeight) Line 2010 + 0x17 bytes C++
PixelMotionBlur.exe!wWinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, HINSTANCE__ * __formal, HINSTANCE__ * __formal) Line 207 C++
PixelMotionBlur.exe!__tmainCRTStartup() Line 547 + 0x2c bytes C
PixelMotionBlur.exe!wWinMainCRTStartup() Line 371 C
kernel32.dll!75e1339a()
[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]
ntdll.dll!77829ed2()
ntdll.dll!77829ea5()
【问题讨论】：
-
它并没有在你认为它崩溃的地方崩溃。
-
这不是崩溃。您是否在启用优化的情况下进行编译？如果是这样，调试器就在向您撒谎崩溃的位置。发布更多代码，并在该地址周围发布反汇编。
-
其他 dll 是否在其 DllMain 中执行任何操作？
-
我正在使用 VS 2010 编译器，我对它很陌生——我认为它没有优化，因为我在项目配置属性中关闭了“整个程序优化”。 VS 是否还有其他地方可以偷偷进行编译优化？
-
@Zac 另一个 dll（即我要加载的那个）肯定没有调用它的 main，因为即使没有 loadlibrary 调用，错误仍然存在：-/
标签： c++ dll handle loadlibrary