diff -r 44fc5f94bc90 Lib/test/test_msilib.py
--- a/Lib/test/test_msilib.py	Mon Apr 04 01:22:06 2011 +0200
+++ b/Lib/test/test_msilib.py	Mon Apr 04 10:36:50 2011 +0800
@@ -3,6 +3,15 @@
 import os
 from test.support import run_unittest, import_module
 msilib = import_module('msilib')
+import msilib.schema
+
+
+def initialize_test_db():
+    path = os.path.join(os.path.dirname(__file__), "test.msi")
+    db = msilib.init_database(
+        path, msilib.schema, "Python Tests", "product_code", "1.0", "PSF")
+    return db, path
+
 
 class Test_make_id(unittest.TestCase):
     #http://msdn.microsoft.com/en-us/library/aa369212(v=vs.85).aspx
@@ -39,6 +48,35 @@
             msilib.make_id(".s\x82o?*+rt"), "_.s_o___rt")
 
 
+class TestSummaryInformation(unittest.TestCase):
+
+    def test_issue1104(self):
+        # msilib.SummaryInfo.GetProperty() truncates the string by one character
+        db, db_path = initialize_test_db()
+        try:
+            sum_info = db.GetSummaryInformation(99)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"Installation Database")
+
+            # the start buffer is 1000 chars long - so test some boundary
+            # conditions
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 999)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 999)
+
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 1000)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 1000)
+
+            sum_info.SetProperty(msilib.PID_TITLE, "a" * 1001)
+            title = sum_info.GetProperty(msilib.PID_TITLE)
+            self.assertEqual(title, b"a" * 1001)
+        finally:
+            db = None
+            sum_info = None
+            os.unlink(db_path)
+
+
 def test_main():
     run_unittest(__name__)
 
diff -r 44fc5f94bc90 PC/_msi.c
--- a/PC/_msi.c	Mon Apr 04 01:22:06 2011 +0200
+++ b/PC/_msi.c	Mon Apr 04 10:36:50 2011 +0800
@@ -534,7 +534,7 @@
     FILETIME fval;
     char sbuf[1000];
     char *sval = sbuf;
-    DWORD ssize = sizeof(sval);
+    DWORD ssize = sizeof(sbuf);
 
     if (!PyArg_ParseTuple(args, "i:GetProperty", &field))
         return NULL;
@@ -542,6 +542,7 @@
     status = MsiSummaryInfoGetProperty(si->h, field, &type, &ival,
         &fval, sval, &ssize);
     if (status == ERROR_MORE_DATA) {
+        ssize++;
         sval = malloc(ssize);
         status = MsiSummaryInfoGetProperty(si->h, field, &type, &ival,
             &fval, sval, &ssize);
@@ -554,7 +555,7 @@
             PyErr_SetString(PyExc_NotImplementedError, "FILETIME result");
             return NULL;
         case VT_LPSTR:
-            result = PyBytes_FromStringAndSize(sval, ssize);
+            result = PyBytes_FromString(sval);
             if (sval != sbuf)
                 free(sval);
             return result;