我想要一段C++调用COM组件中yh_call ( ByVal ls_in_data As String , ByRef ls_out_data As String , ByRef appcode As Long , ByRef appmsg As String )接口的代码
时间: 2024-03-13 18:46:13 浏览: 63
好的,下面是一段调用COM组件中yh_call接口的C代码:
```
#include <windows.h>
#include <tchar.h>
#include <objbase.h>
int main()
{
// 初始化COM组件
CoInitialize(NULL);
// 创建COM组件对象
CLSID clsid;
HRESULT hr = CLSIDFromProgID(L"YourProgID.YourClass", &clsid);
if (FAILED(hr))
{
printf("Failed to get CLSID from ProgID\n");
return 1;
}
IDispatch* pDispatch = NULL;
hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, IID_IDispatch, (void**)&pDispatch);
if (FAILED(hr))
{
printf("Failed to create instance of COM object\n");
return 1;
}
// 调用yh_call接口
VARIANTARG args[4];
VariantInit(&args[0]);
VariantInit(&args[1]);
VariantInit(&args[2]);
VariantInit(&args[3]);
args[0].vt = VT_BSTR;
args[0].bstrVal = SysAllocString(L"input data"); // 输入参数
args[1].vt = VT_BYREF | VT_BSTR;
args[1].pbstrVal = &SysAllocString(L"output data"); // 输出参数
args[2].vt = VT_BYREF | VT_I4;
args[2].plVal = &appcode; // 输出参数
args[3].vt = VT_BYREF | VT_BSTR;
args[3].pbstrVal = &SysAllocString(L"app message"); // 输出参数
DISPID dispid;
LPOLESTR funcName = L"yh_call";
hr = pDispatch->GetIDsOfNames(IID_NULL, &funcName, 1, LOCALE_USER_DEFAULT, &dispid);
if (FAILED(hr))
{
printf("Failed to get ID of yh_call method\n");
return 1;
}
hr = pDispatch->Invoke(dispid, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, &args[0], NULL, NULL, NULL);
if (FAILED(hr))
{
printf("Failed to invoke yh_call method\n");
return 1;
}
// 输出结果
printf("Output data: %ws\nApp code: %d\nApp message: %ws\n", *(args[1].pbstrVal), appcode, *(args[3].pbstrVal));
// 释放资源
VariantClear(&args[0]);
VariantClear(&args[1]);
VariantClear(&args[3]);
pDispatch->Release();
CoUninitialize();
return 0;
}
```
需要注意的是,你需要将代码中的"YourProgID.YourClass"替换成你实际使用的COM组件的ProgID和Class名称。同时,你也需要自己定义appcode变量,并且在调用yh_call接口后,从参数列表中获取它的值。
阅读全文