在代码中插入ax

采用下面代码可以不需要注册ax，直接在程序中调用ax

 

#ifndef COMUtility_H
#define COMUtility_H

//////////////////////////////////////////////////////////////////////////

#include <Windows.h>

//////////////////////////////////////////////////////////////////////////

//	define the prototype of the class factory entry point in a COM dll
typedef HRESULT (STDAPICALLTYPE *DllGetClassObjectT)(REFCLSID clsid, REFIID iid, LPVOID *ppv);

//////////////////////////////////////////////////////////////////////////

template <DWORD dwUnique>
class COMUtilityT
{
public:
	static HRESULT CreateObjectFromPath(REFCLSID clsid, IUnknown **ppUnk, LPCSTR lpszPath)
	{
		//	load the target DLL directly
		HMODULE hModule = LoadLibraryA(lpszPath);
		if (hModule == NULL) {
			return HRESULT_FROM_WIN32(GetLastError());
		}

		return CreateObjectFromPath(hModule, clsid, ppUnk);
	}
	static HRESULT CreateObjectFromPath(REFCLSID clsid, IUnknown **ppUnk, LPCWSTR lpszPath)
	{
		//	load the target DLL directly
		HMODULE hModule = LoadLibraryW(lpszPath);
		if (hModule == NULL) {
			return HRESULT_FROM_WIN32(GetLastError());
		}

		return CreateObjectFromPath(hModule, clsid, ppUnk);
	}

private:
	static HRESULT CreateObjectFromPath(HMODULE hModule, REFCLSID clsid, IUnknown **ppUnk)
	{
		if (hModule == NULL) {
			return HRESULT_FROM_WIN32(GetLastError());
		}

		//	the entry point is an exported function
		DllGetClassObjectT fn = (DllGetClassObjectT) GetProcAddress(hModule, "DllGetClassObject");
		if (fn == NULL) {
			return HRESULT_FROM_WIN32(GetLastError());
		}

		//	create a class factory
		CComPtr<IUnknown> pUnknown;
		HRESULT hr = fn(clsid, IID_IUnknown, (LPVOID *) &pUnknown);
		if (SUCCEEDED(hr)) {
			CComQIPtr<IClassFactory> pClassFactory(pUnknown);
			if (pClassFactory == NULL) {
				hr = E_NOINTERFACE;
			}
			else {
				//	ask the class factory to create the object
				hr = pClassFactory->CreateInstance(NULL, IID_IUnknown, (LPVOID *) ppUnk);
			}
		}
		return hr;
	}
};

//////////////////////////////////////////////////////////////////////////

typedef COMUtilityT<0> COMUtility;

//////////////////////////////////////////////////////////////////////////

#endif

 

delphi代码：

var
DllGetClassObject: function(const CLSID, IID: TGUID; var Obj): HResult; stdcall;
ClassF: IClassFactory;
base: IBaseFilter;
LibHandle: Integer
begin
  LibHandle:= LoadLibrary('xvid.ax');
  DllGetClassObject:= GetProcAddress(LibHandle, 'DllGetClassObject');
  DllGetClassObject(CLSID_XVID, IClassFactory, ClassF);
  ClassF.CreateInstance(nil, IID_IBaseFilter, base);

  FilterGraph.AddFilter(base, 'Xvid Decoder')
end;