1、vc6 编写com
使用VC6.0建立COM组件,工程类型:ATL COM AppWizard
程序代码:
接口:
interface IAdd : IDispatch { [id(1), helpstring("method iadd")] HRESULT iadd([in]int a, [in]int b, [out]int * c); [id(2), helpstring("method fadd")] HRESULT fadd([in]float a, [in]float b, [out]float * c); [id(3), helpstring("method isub")] HRESULT isub([in]int a, [in]int b, [out]int * c); };
实现:
STDMETHODIMP CAdd::iadd(int a, int b, int *c) { // TODO: Add your implementation code here *c = a + b; return S_OK; } STDMETHODIMP CAdd::fadd(float a, float b, float *c) { // TODO: Add your implementation code here *c = a + b; return S_OK; } STDMETHODIMP CAdd::isub(int a, int b, int *c) { // TODO: Add your implementation code here *c = a - b; return S_OK; }
2、VC6.0编写调用程序
使用VC6.0建立MFC应用程序UseCOM,调用刚刚建立的COM组件
将上面程序AddCom生成的AddCom.dll放入本程序的工程目录和程序生成目录中
在StdAfx.h中加入:
#import "AddCom.dll" no_namespace
程序代码:
void CUseComDlg::OnBUTTONUse() { // TODO: Add your control notification handler code here CString strResult; CoInitialize(NULL);//NULL换成0也可以 IAddPtr m_add = NULL; HRESULT hr = S_OK; hr = m_add.CreateInstance(__uuidof(Add)); int d_a = 90; int d_b = 10; int d_c; int d_d; float f_a = 1; float f_b = 2; float f_c; m_add->_IAdd(d_a,d_b,&d_c); m_add->fadd(f_a,f_b,&f_c); m_add->isub(d_a,d_b,&d_d); strResult.Format("返回结果:%d; %f; %d",d_c,f_c,d_d); MessageBox(strResult,"结果",MB_OK); m_add.Release(); m_add = NULL; CoUninitialize();
}