这段时间用VC封装Windows类库,没有MakeObjectInstance处理窗口消息确实不爽,又不想使用MFC的消息映射,这玩意的效率和美观只能呵呵。
至于MakeObjectInstance是什么,Delphi转过来的同学必然很了解这个方便的功能,就是动态构造一个函数把普通函数转到一个类的成员函数。
VC X86实现起来没问题,但是X64实现起来的麻烦在于不能内嵌汇编了,X64必须结合ASM文件编译的obj(这一点还是感激Delphi的编译器,X86和X64都可以内联汇编)。
我的实现方案是通过构造一段ShellCode来达到目的。
SIZE_T PageSize = 4096;
template < typename T> //产生一个代理函数
WNDPROC MakeObjectInstance( LPVOID AObject, T AMethod)
{ union { T MethodAddr; //成员函数指针
LPVOID NomralAddr; //正常指针
}ut; //因为VC不允许成员函数指针转换到普通指针。只能变通的通过union来实现
const unsigned char BlockCode[] = {
#ifdef _WIN64 0x55, //{ push rbp }
0x48, 0x83, 0xEC, 0x40, //{ sub rsp,0x40 }
0x48, 0x8B, 0xEC, //{ mov rbp,rsp }
0x48, 0x89, 0x4D, 0x50, //{ mov[rbp + 0x50],rcx }
0x89, 0x55, 0x58, //{ mov[rbp + 0x58],edx }
0x4C, 0x89, 0x45, 0x60, //{ mov[rbp + 0x60],r8 }
0x4C, 0x89, 0x4D, 0x68, //{ mov[rbp + 0x68],r9 }
0x48, 0xB9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //{ mov rcx,AObject }
0x48, 0x8B, 0x55, 0x50, //{ mov rdx,[rbp + 0x50] }
0x44, 0x8B, 0x45, 0x58, //{ mov r8,[rbp + 0x58] }
0x4C, 0x8B, 0x4D, 0x60, //{ mov r9,[rbp + 0x60] }
0x48, 0x8B, 0x45, 0x68, //{ mov rax,[rbp + 0x68] }
0x48, 0x89, 0x44, 0x24, 0x20, //{ mov[rsp + 0x20],rax }
0x49, 0xBB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //{ mov r11, AMethod }
0x49, 0xFF, 0xD3, //{ call r11 }
0x48, 0x8D, 0x65, 0x40, //{ lea rsp,[rbp + 0x40] }
0x5D, //{ pop rbp }
0xC3 //{ ret }
#else 0x58, //{ pop eax }
0x68, 0x00, 0x00, 0x00, 0x00, //{ push AObject }
0x50, //{ push eax }
0xB8, 0x00, 0x00, 0x00, 0x00, //{ mov eax, AMethod }
0xFF, 0xE0 //{ jmp eax }
#endif // endif }; size_t CodeBytes = sizeof (BlockCode);
LPVOID Block = VirtualAlloc( nullptr , PageSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
memcpy (Block, BlockCode, CodeBytes);
unsigned char * bBlock = (unsigned char *)Block;
ut.MethodAddr = AMethod; #ifdef _WIN64 * PLONG64 (&bBlock[25])= LONG64 (AObject);
* PLONG64 (&bBlock[0x38]) = LONG64 (ut.NomralAddr);
#else * PLONG32 (&bBlock[2]) = LONG32 (AObject);
* PLONG32 (&bBlock[8]) = LONG32 (ut.NomralAddr);
#endif return (WNDPROC)Block;
} //释放代理函数 void FreeObjectInstance(WNDPROC wndProc)
{ VirtualFree(wndProc, PageSize, MEM_RELEASE); } |
用法类似的如下
class MyClass{
LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
} MyClass c; WNDCLASSEXW wcex; wcex.cbSize = sizeof (WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = MakeObjectInstance(&c, &MyClass::WndProc); //使用MyClass::WndProc作为创消息处理函数
wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WNDPROCTEST)); wcex.hCursor = LoadCursor( nullptr , IDC_ARROW);
wcex.hbrBackground = ( HBRUSH )(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_WNDPROCTEST); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); RegisterClassExW(&wcex); |
再例如
class MyClass{
LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
} MyClass c; SetWindowLongPtr(hWnd, GWL_WNDPROC, ( LONG_PTR )MakeObjectInstance(&c, &MyClass::WndProc));
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