Opening an Enhanced Metafile and Displaying Its Contents

This section contains an example demonstrating how an application opens an enhanced metafile stored on disk and displays the associated picture in the client area.

The example uses the Open common dialog box to enable the user to select an enhanced metafile from a list of existing files. It then passes the name of the selected file to the GetEnhMetaFile function, which returns a handle identifying the file. This handle is passed to the PlayEnhMetaFile function in order to display the picture.

LoadString(hInst, IDS_FILTERSTRING,

(LPSTR)szFilter, sizeof(szFilter));

/*

* Replace occurrences of '%' string separator

* with '\0'.

*/

for (i=0; szFilter[i]!='\0'; i++)

if (szFilter[i] == '%')

szFilter[i] = '\0';

LoadString(hInst, IDS_DEFEXTSTRING,

(LPSTR)szDefExt, sizeof(szFilter));

/*

* Use the OpenFilename common dialog box

* to obtain the desired filename.

*/

szFile[0] = '\0';

Ofn.lStructSize = sizeof(OPENFILENAME);

Ofn.hwndOwner = hWnd;

Ofn.lpstrFilter = szFilter;

Ofn.lpstrCustomFilter = (LPSTR)NULL;

Ofn.nMaxCustFilter = 0L;

Ofn.nFilterIndex = 1L;

Ofn.lpstrFile = szFile;

Ofn.nMaxFile = sizeof(szFile);

Ofn.lpstrFileTitle = szFileTitle;

Ofn.nMaxFileTitle = sizeof(szFileTitle);

Ofn.lpstrInitialDir = (LPSTR) NULL;

Ofn.lpstrTitle = (LPSTR)NULL;

Ofn.Flags = OFN_SHOWHELP | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;

Ofn.nFileOffset = 0;

Ofn.nFileExtension = 0;

Ofn.lpstrDefExt = szDefExt;

GetOpenFileName(&Ofn);

/* Open the metafile. */

hemf = GetEnhMetaFile(Ofn.lpstrFile);

/* Retrieve a handle to a window DC. */

hDC = GetDC(hWnd);

/* Retrieve the client rectangle dimensions. */

GetClientRect(hWnd, &rct);

/* Draw the picture. */

PlayEnhMetaFile(hDC, hemf, &rct);

/* Release the metafile handle. */

DeleteEnhMetaFile(hemf);

/* Release the window DC. */

ReleaseDC(hWnd, hDC);