The following example demonstrates automatically sizing the ltmfCapture object's video frame window to the actual size of the media.
// include the LEAD Media Foundation TOOLKIT header
#include "ltmf.h"
#include "resource.h"
#include <tchar.h>
#include <stdio.h>
#include <assert.h>
#define SZ_WNDCLASS_CAPTURE _T("CAPTURE WNDCLASS")
#define WM_CAPTURENOTIFY (WM_USER + 1000)
HINSTANCE g_hInstance; // application instance handle
HWND g_hwndCapture; // video frame window
IltmfCapture* g_pCapture; // capture object interface pointer
//
// CaptureWndProc
// video frame window procedure
//
LRESULT CALLBACK CaptureWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
IltmfDevices* pDevices;
switch (message)
{
case WM_CREATE:
g_hwndCapture = hwnd;
// window is the video window frame
g_pCapture->put_VideoWindowFrame((long) hwnd);
// force the frame window to be automatically resized to the video
g_pCapture->put_AutoSize(VARIANT_TRUE);
#ifdef _DEBUG
{
VARIANT_BOOL f;
g_pCapture->get_AutoSize(&f);
assert(f != 0);
}
#endif
// set preview source video only
g_pCapture->put_PreviewSource(ltmfCapture_Preview_Video);
// enable preview
g_pCapture->put_Preview(VARIANT_TRUE);
// select the first video device available
g_pCapture->get_VideoDevices(&pDevices);
pDevices->put_Selection(0);
pDevices->Release();
return 0;
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
HRESULT hr;
WNDCLASSEX wcex;
g_hInstance = hInstance;
// initialize COM library
hr = CoInitialize(NULL);
if(FAILED(hr))
goto error;
// register the video frame window class
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = CaptureWndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = g_hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH) (COLOR_APPWORKSPACE + 1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = SZ_WNDCLASS_CAPTURE;
wcex.hIconSm = NULL;
if(!RegisterClassEx(&wcex))
goto error;
// create the capture object
hr = CoCreateInstance(CLSID_ltmfCapture, NULL, CLSCTX_INPROC_SERVER, IID_IltmfCapture, (void**) &g_pCapture);
if(FAILED(hr))
goto error;
// create the video frame window
if(!CreateWindow(SZ_WNDCLASS_CAPTURE, _T("Capture"), WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, g_hInstance, NULL))
goto error;
ShowWindow(g_hwndCapture, nCmdShow);
UpdateWindow(g_hwndCapture);
// process until done
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
error:
if(g_pCapture)
g_pCapture->Release();
CoUninitialize();
return 0;
}
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