File open dialog problem.

[gaby]

Hi all

I have implemented the file open dialog as it is described in
installsite.org,
and i have 2 problems.

1) Filter- i can't get the dialog to show only the files i am interested in
(db files).
the filter does appear inside the lile where it should be, but All files
are shown
in the specified directory.

2) I get an error massage when i use the dialog every seconed time, but
only
if i have chosen a file. that means- open the dialog,choose a file, open
the dialog again- you get the error massage (nErr = -1 the massage said that
the function can't open the file) . but if you open the dialog, choose a
file and then cancel- you don't get the error. should i handle the dialog
window for a smooth exit
or is done by windows itself ?

what am i doing wrong ?

bdw- what is the meaning of the bDerefLinks in the function ?
here is the code :
FileBrowseDlg( szCertFile, 512,
szFilter,
"Select something",
"c:\\",
bMultiSel,
listFiles,
bDerefLinks );

function FileBrowseDlg( szFile, nszFileSize, szFilter, szDialogTitle,
szInitialDir, bMultiSel, listFiles, bDerefLinks )
OPENFILENAME ofn;
STRING szMsg, szFileTitle[260];
STRING szCustomFilter[260], szTemp[260];
LONG Result, n, nFlags, nErr;
begin

UseDLL(WINSYSDIR ^ "comdlg32.dll");

nFlags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY |
OFN_NOCHANGEDIR | OFN_EXPLORER;
if bMultiSel then
nFlags = nFlags | OFN_ALLOWMULTISELECT;
endif;
if bDerefLinks = FALSE then
nFlags = nFlags | OFN_NODEREFERENCELINKS;
endif;

Result = GetWindowHandle(HWND_INSTALL);

// Notice how the address of an explicitly sized string
// is used when assigning to a member who was declared
// as a LONG string pointer (lpstr). For example, &szFilter.
ofn.lStructSize = 76;
ofn.hwndOwner = nResult;
ofn.lpstrFilter = &szFilter;
ofn.nFilterIndex = 1;
ofn.lpstrFile = &szFile;
ofn.nMaxFile = nszFileSize;
ofn.lpstrFileTitle = &szFileTitle;
ofn.nMaxFileTitle = 260;
ofn.lpstrTitle = &szDialogTitle;
ofn.Flags = nFlags;
ofn.lpstrDefExt = &szTemp;
ofn.lpstrInitialDir = &szInitialDir;
ofn.hInstance = 0;
ofn.lpstrCustomFilter = &szCustomFilter;
ofn.nMaxCustFilter = 260;
ofn.lpfnHook = 0;

nResult = GetOpenFileNameA(&ofn);
if Result = 1 then
// IMPORTANT: InstallShield does not allow you to access
// string contents directly through a structure member
// declared as LONG pointer (lpstr), so you must use the
// STRING whose address was stored there instead.
if bMultiSel then
StrGetTokens(listFiles, szFile, "");
else
szFile = szFile;
endif;
else
nErr = CommDlgExtendedError();
switch (nErr)
case CDERR_DIALOGFAILURE: szMsg = CDERR_DIALOGFAILURE_MSG;
case CDERR_FINDRESFAILURE: szMsg = CDERR_FINDRESFAILURE_MSG;
case CDERR_INITIALIZATION: szMsg = CDERR_INITIALIZATION_MSG;
case CDERR_LOADRESFAILURE: szMsg = CDERR_LOADRESFAILURE_MSG;
case CDERR_LOADSTRFAILURE: szMsg = CDERR_LOADSTRFAILURE_MSG;
case CDERR_LOCKRESFAILURE: szMsg = CDERR_LOCKRESFAILURE_MSG;
case CDERR_MEMALLOCFAILURE: szMsg = CDERR_MEMALLOCFAILURE_MSG;
case CDERR_MEMLOCKFAILURE: szMsg = CDERR_MEMLOCKFAILURE_MSG;
case CDERR_NOHINSTANCE: szMsg = CDERR_NOHINSTANCE_MSG;
case CDERR_NOHOOK: szMsg = CDERR_NOHOOK_MSG;
case CDERR_NOTEMPLATE: szMsg = CDERR_NOTEMPLATE_MSG;
case CDERR_REGISTERMSGFAIL: szMsg = CDERR_REGISTERMSGFAIL_MSG;
case CDERR_STRUCTSIZE: szMsg = CDERR_STRUCTSIZE_MSG;
case FNERR_BUFFERTOOSMALL: szMsg = FNERR_BUFFERTOOSMALL_MSG;
case FNERR_INVALIDFILENAME: szMsg = FNERR_INVALIDFILENAME_MSG;
case FNERR_SUBCLASSFAILURE: szMsg = FNERR_SUBCLASSFAILURE_MSG;
endswitch;
if nErr != 0 then
// User did not close or cancel dialog box.
MessageBox("FileBrowseDlg() error:\n\n" + szMsg, SEVERE);
endif;
return -1;
endif;

UnUseDLL(WINSYSDIR ^ "comdlg32.dll");

return 0;
end;