#include "ltmm.h"
#include "resource.h"
#include "tchar.h"
#include "stdio.h"
HINSTANCE g_hInstance;
// application instance handle
IltmmCapture* g_pCapture;
// convert object's interface pointer
//
// BuildCaptureInputList
// fills a listbox to match the contents of the collection
//
// pCaptureInputs = input collection's interface pointer
// hwndListBox = listbox window handle
//
void BuildCaptureInputList(IltmmCaptureInputs* pCaptureInputs, HWND hwndListBox)
{
long i;
long count;
int selected = -1;
// reset the listbox contents
SendMessage(hwndListBox, LB_RESETCONTENT, 0, 0);
// get the collection's item count
pCaptureInputs->get_Count(&count);
for(i = 0; i < count; i++)
{
IltmmCaptureInput* pCaptureInput;
BSTR bstr;
TCHAR sz[256];
int index;
VARIANT_BOOL f;
// retrieve collection item
pCaptureInputs->Item(i, &pCaptureInput);
// get displayable name
pCaptureInput->get_Name(&bstr);
// convert from unicode
_stprintf(sz, _T("%ls"), bstr);
// free name
SysFreeString(bstr);
// add the name to the listbox
index = SendMessage(hwndListBox, LB_ADDSTRING, 0, (LPARAM) (LPCTSTR) sz);
// associate the listbox item with the collection item index
SendMessage(hwndListBox, LB_SETITEMDATA, index, i);
// remember this listbox item, if it is selected in the collection
pCaptureInput->get_Selected(&f);
if(f)
selected = i;
// free the collection item
pCaptureInput->Release();
}
// select the appropriate listbox item
for(i = 0; i < count; i++)
{
if(selected == (long) SendMessage(hwndListBox, LB_GETITEMDATA, i, 0))
{
SendMessage(hwndListBox, LB_SETCURSEL, i, 0);
break;
}
}
}
//
// CaptureInputSelectionChanged
// called to reflect changes in the listbox selection
//
// pCaptureInputs = input collection's interface pointer
// hwndListBox = listbox window handle
//
void CaptureInputSelectionChanged(IltmmCaptureInputs* pCaptureInputs, HWND hwndListBox)
{
int index;
long item;
int i;
int count;
HRESULT hr;
// get the index of current listbox selection
index = (int) SendMessage(hwndListBox, LB_GETCURSEL, 0, 0);
if(index < 0)
{
// clear selection
pCaptureInputs->put_Selection(-1);
}
else
{
// get the collection item index
item = (long) SendMessage(hwndListBox, LB_GETITEMDATA, index, 0);
// select the item
#ifdef _DEBUG
{
IltmmCaptureInput* pCaptureInput;
pCaptureInputs->Item(item, &pCaptureInput);
hr = pCaptureInput->put_Selected(VARIANT_TRUE);
pCaptureInput->Release();
}
#else
hr = pCaptureInputs->put_Selection(item);
#endif
// if new selection failed, we need to force the listbox to match the actual selection
if(FAILED(hr))
{
// get the real selection
pCaptureInputs->get_Selection(&item);
// find the matching listbox item
count = (int) SendMessage(hwndListBox, LB_GETCOUNT, 0, 0);
for(i = 0; i < count; i++)
{
if(item == (long) SendMessage(hwndListBox, LB_GETITEMDATA, i, 0))
{
SendMessage(hwndListBox, LB_SETCURSEL, i, 0);
break;
}
}
}
}
}
//
// SelectCompositeVideo
// selects composite video, if available
//
// pCaptureInputs = input collection's interface pointer
// hwndListBox = listbox window handle
//
void SelectCompositeVideo(IltmmCaptureInputs* pCaptureInputs, HWND hwndListBox)
{
long item;
BSTR bstr;
long i;
long count;
// Find the composite video input
bstr = SysAllocString(L"Video Composite");
pCaptureInputs->Find(bstr, &item);
SysFreeString(bstr);
// make it the current selection
if(item >= 0)
{
pCaptureInputs->put_Selection(item);
pCaptureInputs->get_Count(&count);
// select the appropriate listbox item
for(i = 0; i < count; i++)
{
if(item == (long) SendMessage(hwndListBox, LB_GETITEMDATA, i, 0))
{
SendMessage(hwndListBox, LB_SETCURSEL, i, 0);
break;
}
}
}
}
//
// CaptureInputDlgProc
// selects object inputs
//
BOOL CALLBACK CaptureInputDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
IltmmCaptureInputs* pCaptureInputs;
switch (msg)
{
case WM_INITDIALOG:
// initialize the video input listbox
g_pCapture->get_VideoInputs(&pCaptureInputs);
BuildCaptureInputList(pCaptureInputs, GetDlgItem(hwnd, IDC_VIDEOINPUTS));
pCaptureInputs->Release();
return TRUE;
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDC_SELECTCOMPOSITEVIDEO:
// select composite video
g_pCapture->get_VideoInputs(&pCaptureInputs);
SelectCompositeVideo(pCaptureInputs, GetDlgItem(hwnd, IDC_VIDEOINPUTS));
pCaptureInputs->Release();
return TRUE;
break;
case IDC_VIDEOINPUTS:
if(HIWORD(wParam) == LBN_SELCHANGE)
{
// select the video input
g_pCapture->get_VideoInputs(&pCaptureInputs);
CaptureInputSelectionChanged(pCaptureInputs, GetDlgItem(hwnd, IDC_VIDEOINPUTS));
pCaptureInputs->Release();
}
break;
case IDOK:
EndDialog(hwnd, IDOK);
return TRUE;
break;
}
break;
} return FALSE;
}
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HRESULT hr;
IltmmDevices* pDevices;
g_hInstance = hInstance;
// initialize COM library
hr = CoInitialize(NULL);
if(FAILED(hr))
goto error;
// create the capture object
hr = CoCreateInstance(CLSID_ltmmCapture, NULL, CLSCTX_INPROC_SERVER, IID_IltmmCapture, (void**) &g_pCapture);
if(FAILED(hr))
goto error;
// select the first audio device available
g_pCapture->get_AudioDevices(&pDevices);
pDevices->put_Selection(0);
pDevices->Release();
// select the first video device available
g_pCapture->get_VideoDevices(&pDevices);
pDevices->put_Selection(0);
pDevices->Release();
DialogBox(g_hInstance, (LPCTSTR)IDD_INPUTDLG, NULL, CaptureInputDlgProc); error:
// cleanup
if(g_pCapture)
g_pCapture->Release();
CoUninitialize();
return 0;
}
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