使用 ATL 开发和调用 COM 组件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#include "stdafx.h"
#include "ATL1.h"
#include "ATL1_i.c"

int main()
{
ITest * pITest;
HRESULT hResult;

if (CoInitialize(NULL) != S_OK)
{
printf("Initialize COM library failed!n");
return -1;
}

GUID ATL1CLSID;
hResult = ::CLSIDFromProgID(L"ATL1.Test", &ATL1CLSID);

if (hResult != S_OK)
{
printf("Can't find the ATL1 CLSID!n");
return -2;
}

hResult = CoCreateInstance(ATL1CLSID, NULL, CLSCTX_INPROC_SERVER, IID_ITest, (void **)&pITest);
if (hResult != S_OK)
{
printf("Create object failed!n");
return -2;
}

printf("Call ITest interface's functions...n");
double k;
double *ans = &k;
pITest->getArea(3, 4, 5, ans);
printf("3,4,5=%.2lfn",*ans);
printf("Test over...n");

pITest->Release();
CoUninitialize();

return 0;
}