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// 18 august 2014
#include "winapi_windows.h"
#include "_cgo_export.h"
static LRESULT CALLBACK dialogSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
switch (uMsg) {
case WM_COMMAND:
// we must re-enable other windows in the right order (see http://blogs.msdn.com/b/oldnewthing/archive/2004/02/27/81155.aspx)
if (HIWORD(wParam) == BN_CLICKED && LOWORD(wParam) == IDCANCEL)
SendMessageW(msgwin, msgEndModal, 0, 0);
break; // let the dialog handle it now
case WM_NCDESTROY:
if ((*fv_RemoveWindowSubclass)(hwnd, dialogSubProc, id) == FALSE)
xpanic("error removing dialog subclass (which was for its own event handler)", GetLastError());
}
return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
}
// this should be reasonable
#define NFILENAME 4096
static UINT_PTR CALLBACK openSaveFileHook(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
if (uMsg == WM_INITDIALOG) {
HWND parent;
parent = GetParent(hwnd);
if (parent == NULL)
xpanic("error gettign parent of OpenFile() dialog for event handling", GetLastError());
if ((*fv_SetWindowSubclass)(parent, dialogSubProc, 0, (DWORD_PTR) NULL) == FALSE)
xpanic("error subclassing OpenFile() dialog to give it its own event handler", GetLastError());
} else if (uMsg == WM_NOTIFY) {
OFNOTIFY *of = (OFNOTIFY *) lParam;
if (of->hdr.code == CDN_FILEOK)
SendMessageW(msgwin, msgEndModal, 0, 0);
}
return 0;
}
WCHAR *openFile(void)
{
OPENFILENAMEW ofn;
DWORD err;
WCHAR *filenameBuffer;
// freed on the Go side
filenameBuffer = (WCHAR *) malloc((NFILENAME + 1) * sizeof (WCHAR));
if (filenameBuffer == NULL)
xpanic("memory exhausted in OpenFile()", GetLastError());
filenameBuffer[0] = L'\0'; // required by GetOpenFileName() to indicate no previous filename
ZeroMemory(&ofn, sizeof (OPENFILENAMEW));
ofn.lStructSize = sizeof (OPENFILENAMEW);
ofn.hwndOwner = NULL;
ofn.hInstance = hInstance;
ofn.lpstrFilter = NULL; // no filters
ofn.lpstrFile = filenameBuffer;
ofn.nMaxFile = NFILENAME + 1; // TODO include + 1?
ofn.lpstrInitialDir = NULL; // let system decide
ofn.lpstrTitle = NULL; // let system decide
// TODO OFN_SHAREAWARE?
ofn.Flags = OFN_ENABLEHOOK | OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_FORCESHOWHIDDEN | OFN_HIDEREADONLY | OFN_LONGNAMES | OFN_NOCHANGEDIR | OFN_NODEREFERENCELINKS | OFN_NOTESTFILECREATE | OFN_PATHMUSTEXIST;
ofn.lpfnHook = openSaveFileHook;
SendMessageW(msgwin, msgBeginModal, 0, 0);
if (GetOpenFileNameW(&ofn) == FALSE) {
err = CommDlgExtendedError();
if (err == 0) // user cancelled
return NULL;
xpaniccomdlg("error running open file dialog", err);
}
return filenameBuffer;
}
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