1 files changed, 62 insertions, 0 deletions
diff --git a/dialog_windows.c b/dialog_windows.c
new file mode 100644
index 0000000..f8ef687
--- /dev/null
+++ b/dialog_windows.c
@@ -0,0 +1,62 @@
+// 18 august 2014
+
+#include "winapi_windows.h"
+#include "_cgo_export.h"
+
+// this should be reasonable
+#define NFILENAME 4096
+
+struct openFileData {
+	HWND parent;
+	void *f;
+	WCHAR *filenameBuffer;
+};
+
+static DWORD WINAPI doOpenFile(LPVOID data)
+{
+	struct openFileData *o = (struct openFileData *) data;
+	OPENFILENAMEW ofn;
+	DWORD err;
+
+	o->filenameBuffer[0] = L'\0';			// required by GetOpenFileName() to indicate no previous filename
+	ZeroMemory(&ofn, sizeof (OPENFILENAMEW));
+	ofn.lStructSize = sizeof (OPENFILENAMEW);
+	ofn.hwndOwner = o->parent;
+	ofn.hInstance = hInstance;
+	ofn.lpstrFilter = NULL;			// no filters
+	ofn.lpstrFile = o->filenameBuffer;
+	ofn.nMaxFile = NFILENAME + 1;	// seems to include null terminator according to docs
+	ofn.lpstrInitialDir = NULL;			// let system decide
+	ofn.lpstrTitle = NULL;			// let system decide
+	// TODO OFN_SHAREAWARE?
+	ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_FORCESHOWHIDDEN | OFN_HIDEREADONLY | OFN_LONGNAMES | OFN_NOCHANGEDIR | OFN_NODEREFERENCELINKS | OFN_NOTESTFILECREATE | OFN_PATHMUSTEXIST;
+	if (GetOpenFileNameW(&ofn) == FALSE) {
+		err = CommDlgExtendedError();
+		if (err != 0)				// user cancelled
+			xpaniccomdlg("error running open file dialog", err);
+		free(o->filenameBuffer);		// free now so we can set it to NULL without leaking
+		o->filenameBuffer = NULL;
+	}
+	if (PostMessageW(msgwin, msgOpenFileDone, (WPARAM) (o->filenameBuffer), (LPARAM) (o->f)) == 0)
+		xpanic("error posting OpenFile() finished message to message-only window", GetLastError());
+	free(o);		// won't free o->f or o->filenameBuffer in above invocation
+	return 0;
+}
+
+void openFile(HWND hwnd, void *f)
+{
+	struct openFileData *o;
+
+	// freed by the thread
+	o = (struct openFileData *) malloc(sizeof (struct openFileData));
+	if (o == NULL)
+		xpanic("memory exhausted allocating data structure in OpenFile()", GetLastError());
+	o->parent = hwnd;
+	o->f = f;
+	// freed on the Go side
+	o->filenameBuffer = (WCHAR *) malloc((NFILENAME + 1) * sizeof (WCHAR));
+	if (o->filenameBuffer == NULL)
+		xpanic("memory exhausted allocating filename buffer in OpenFile()", GetLastError());
+	if (CreateThread(NULL, 0, doOpenFile, (LPVOID) o, 0, NULL) == NULL)
+		xpanic("error creating thread for running OpenFIle()", GetLastError());
+}