Merge pull request #148 from mappu/miqt-zero-length-slices

Add checks for zero-length byte slices
mappu · Jan 24, 2025 · 6b42179 · 6b42179
2 parents a80a939 + a4b99fc
commit 6b42179
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Showing 318 changed files with 3,280 additions and 653 deletions.
diff --git a/cmd/genbindings/emitgo.go b/cmd/genbindings/emitgo.go
@@ -333,7 +333,11 @@ func (gfs *goFileState) emitParameterGo2CABIForwarding(p CppParameter) (preamble
 
 		gfs.imports["unsafe"] = struct{}{}
 		preamble += nameprefix + "_alias := C.struct_miqt_string{}\n"
+		preamble += "if len(" + p.ParameterName + ") > 0 {\n"
 		preamble += nameprefix + "_alias.data = (*C.char)(unsafe.Pointer(&" + p.ParameterName + "[0]))\n"
+		preamble += "} else {\n"
+		preamble += nameprefix + "_alias.data = (*C.char)(unsafe.Pointer(nil))\n"
+		preamble += "}\n"
 		preamble += nameprefix + "_alias.len = C.size_t(len(" + p.ParameterName + "))\n"
 
 		rvalue = nameprefix + "_alias"

diff --git a/examples/marshalling/marshalling_test.go b/examples/marshalling/marshalling_test.go
@@ -106,6 +106,17 @@ func testMarshalling(t *testing.T) {
 		}
 	})
 
+	t.Run("QByteArray of zero length", func(t *testing.T) {
+
+		input := ""
+		ba := qt.QFile_EncodeName(input)
+		got := qt.QFile_DecodeName(ba)
+
+		if input != got {
+			t.Fatalf("QByteArray: expected %q, got %q", input, got)
+		}
+	})
+
 	// QMap
 	t.Run("QMap", func(t *testing.T) {
 		input := make(map[string]qt.QVariant)

diff --git a/qt-extras/scintillaedit/gen_ScintillaEdit.go b/qt-extras/scintillaedit/gen_ScintillaEdit.go
@@ -6022,7 +6022,11 @@ func miqt_exec_callback_ScintillaEditBase_UpdateUi(cb C.intptr_t, updated C.int)
 
 func (this *ScintillaEditBase) Modified(typeVal Scintilla__ModificationFlags, position uintptr, length uintptr, linesAdded uintptr, text []byte, line uintptr, foldNow Scintilla__FoldLevel, foldPrev Scintilla__FoldLevel) {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 	C.ScintillaEditBase_Modified(this.h, (C.int)(typeVal), (C.intptr_t)(position), (C.intptr_t)(length), (C.intptr_t)(linesAdded), text_alias, (C.intptr_t)(line), (C.int)(foldNow), (C.int)(foldPrev))
 }
@@ -7691,7 +7695,11 @@ func miqt_exec_callback_ScintillaEditBase_HideEvent(self *C.ScintillaEditBase, c
 
 func (this *ScintillaEditBase) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.ScintillaEditBase_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.long)(unsafe.Pointer(result))))
@@ -8157,7 +8165,11 @@ func (this *ScintillaDocument) IsReadOnly() bool {
 
 func (this *ScintillaDocument) InsertString(position int, str []byte) {
 	str_alias := C.struct_miqt_string{}
-	str_alias.data = (*C.char)(unsafe.Pointer(&str[0]))
+	if len(str) > 0 {
+		str_alias.data = (*C.char)(unsafe.Pointer(&str[0]))
+	} else {
+		str_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	str_alias.len = C.size_t(len(str))
 	C.ScintillaDocument_InsertString(this.h, (C.int)(position), str_alias)
 }
@@ -8292,7 +8304,11 @@ func miqt_exec_callback_ScintillaDocument_SavePoint(cb C.intptr_t, atSavePoint C
 
 func (this *ScintillaDocument) Modified(position int, modification_type int, text []byte, length int, linesAdded int, line int, foldLevelNow int, foldLevelPrev int) {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 	C.ScintillaDocument_Modified(this.h, (C.int)(position), (C.int)(modification_type), text_alias, (C.int)(length), (C.int)(linesAdded), (C.int)(line), (C.int)(foldLevelNow), (C.int)(foldLevelPrev))
 }
@@ -13361,7 +13377,11 @@ func miqt_exec_callback_ScintillaEdit_HideEvent(self *C.ScintillaEdit, cb C.intp
 
 func (this *ScintillaEdit) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.ScintillaEdit_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.long)(unsafe.Pointer(result))))

diff --git a/qt-restricted-extras/qscintilla/gen_qsciscintilla.go b/qt-restricted-extras/qscintilla/gen_qsciscintilla.go
@@ -4248,7 +4248,11 @@ func miqt_exec_callback_QsciScintilla_FromMimeData(self *C.QsciScintilla, cb C.i
 
 	virtualReturn := gofunc((&QsciScintilla{h: self}).callVirtualBase_FromMimeData, slotval1, slotval2)
 	virtualReturn_alias := C.struct_miqt_string{}
-	virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	if len(virtualReturn) > 0 {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	} else {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	virtualReturn_alias.len = C.size_t(len(virtualReturn))
 
 	return virtualReturn_alias
@@ -4257,7 +4261,11 @@ func miqt_exec_callback_QsciScintilla_FromMimeData(self *C.QsciScintilla, cb C.i
 
 func (this *QsciScintilla) callVirtualBase_ToMimeData(text []byte, rectangular bool) *qt.QMimeData {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 
 	return qt.UnsafeNewQMimeData(unsafe.Pointer(C.QsciScintilla_virtualbase_ToMimeData(unsafe.Pointer(this.h), text_alias, (C.bool)(rectangular))))
@@ -5270,7 +5278,11 @@ func miqt_exec_callback_QsciScintilla_HideEvent(self *C.QsciScintilla, cb C.intp
 
 func (this *QsciScintilla) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.QsciScintilla_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.long)(unsafe.Pointer(result))))

diff --git a/qt-restricted-extras/qscintilla/gen_qsciscintillabase.go b/qt-restricted-extras/qscintilla/gen_qsciscintillabase.go
@@ -2253,7 +2253,11 @@ func miqt_exec_callback_QsciScintillaBase_FromMimeData(self *C.QsciScintillaBase
 
 	virtualReturn := gofunc((&QsciScintillaBase{h: self}).callVirtualBase_FromMimeData, slotval1, slotval2)
 	virtualReturn_alias := C.struct_miqt_string{}
-	virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	if len(virtualReturn) > 0 {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	} else {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	virtualReturn_alias.len = C.size_t(len(virtualReturn))
 
 	return virtualReturn_alias
@@ -2262,7 +2266,11 @@ func miqt_exec_callback_QsciScintillaBase_FromMimeData(self *C.QsciScintillaBase
 
 func (this *QsciScintillaBase) callVirtualBase_ToMimeData(text []byte, rectangular bool) *qt.QMimeData {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 
 	return qt.UnsafeNewQMimeData(unsafe.Pointer(C.QsciScintillaBase_virtualbase_ToMimeData(unsafe.Pointer(this.h), text_alias, (C.bool)(rectangular))))
@@ -3381,7 +3389,11 @@ func miqt_exec_callback_QsciScintillaBase_HideEvent(self *C.QsciScintillaBase, c
 
 func (this *QsciScintillaBase) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.QsciScintillaBase_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.long)(unsafe.Pointer(result))))

diff --git a/qt-restricted-extras/qscintilla6/gen_qsciscintilla.go b/qt-restricted-extras/qscintilla6/gen_qsciscintilla.go
@@ -4217,7 +4217,11 @@ func miqt_exec_callback_QsciScintilla_FromMimeData(self *C.QsciScintilla, cb C.i
 
 	virtualReturn := gofunc((&QsciScintilla{h: self}).callVirtualBase_FromMimeData, slotval1, slotval2)
 	virtualReturn_alias := C.struct_miqt_string{}
-	virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	if len(virtualReturn) > 0 {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	} else {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	virtualReturn_alias.len = C.size_t(len(virtualReturn))
 
 	return virtualReturn_alias
@@ -4226,7 +4230,11 @@ func miqt_exec_callback_QsciScintilla_FromMimeData(self *C.QsciScintilla, cb C.i
 
 func (this *QsciScintilla) callVirtualBase_ToMimeData(text []byte, rectangular bool) *qt6.QMimeData {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 
 	return qt6.UnsafeNewQMimeData(unsafe.Pointer(C.QsciScintilla_virtualbase_ToMimeData(unsafe.Pointer(this.h), text_alias, (C.bool)(rectangular))))
@@ -5265,7 +5273,11 @@ func miqt_exec_callback_QsciScintilla_HideEvent(self *C.QsciScintilla, cb C.intp
 
 func (this *QsciScintilla) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *uintptr) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.QsciScintilla_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.intptr_t)(unsafe.Pointer(result))))

diff --git a/qt-restricted-extras/qscintilla6/gen_qsciscintillabase.go b/qt-restricted-extras/qscintilla6/gen_qsciscintillabase.go
@@ -2222,7 +2222,11 @@ func miqt_exec_callback_QsciScintillaBase_FromMimeData(self *C.QsciScintillaBase
 
 	virtualReturn := gofunc((&QsciScintillaBase{h: self}).callVirtualBase_FromMimeData, slotval1, slotval2)
 	virtualReturn_alias := C.struct_miqt_string{}
-	virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	if len(virtualReturn) > 0 {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(&virtualReturn[0]))
+	} else {
+		virtualReturn_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	virtualReturn_alias.len = C.size_t(len(virtualReturn))
 
 	return virtualReturn_alias
@@ -2231,7 +2235,11 @@ func miqt_exec_callback_QsciScintillaBase_FromMimeData(self *C.QsciScintillaBase
 
 func (this *QsciScintillaBase) callVirtualBase_ToMimeData(text []byte, rectangular bool) *qt6.QMimeData {
 	text_alias := C.struct_miqt_string{}
-	text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	if len(text) > 0 {
+		text_alias.data = (*C.char)(unsafe.Pointer(&text[0]))
+	} else {
+		text_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	text_alias.len = C.size_t(len(text))
 
 	return qt6.UnsafeNewQMimeData(unsafe.Pointer(C.QsciScintillaBase_virtualbase_ToMimeData(unsafe.Pointer(this.h), text_alias, (C.bool)(rectangular))))
@@ -3376,7 +3384,11 @@ func miqt_exec_callback_QsciScintillaBase_HideEvent(self *C.QsciScintillaBase, c
 
 func (this *QsciScintillaBase) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *uintptr) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.QsciScintillaBase_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.intptr_t)(unsafe.Pointer(result))))

diff --git a/qt/cbor/gen_qcborstreamreader.go b/qt/cbor/gen_qcborstreamreader.go
@@ -97,7 +97,11 @@ func NewQCborStreamReader3(data *byte, lenVal int64) *QCborStreamReader {
 // NewQCborStreamReader4 constructs a new QCborStreamReader object.
 func NewQCborStreamReader4(data []byte) *QCborStreamReader {
 	data_alias := C.struct_miqt_string{}
-	data_alias.data = (*C.char)(unsafe.Pointer(&data[0]))
+	if len(data) > 0 {
+		data_alias.data = (*C.char)(unsafe.Pointer(&data[0]))
+	} else {
+		data_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	data_alias.len = C.size_t(len(data))
 
 	return newQCborStreamReader(C.QCborStreamReader_new4(data_alias))
@@ -119,7 +123,11 @@ func (this *QCborStreamReader) Device() *qt.QIODevice {
 
 func (this *QCborStreamReader) AddData(data []byte) {
 	data_alias := C.struct_miqt_string{}
-	data_alias.data = (*C.char)(unsafe.Pointer(&data[0]))
+	if len(data) > 0 {
+		data_alias.data = (*C.char)(unsafe.Pointer(&data[0]))
+	} else {
+		data_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	data_alias.len = C.size_t(len(data))
 	C.QCborStreamReader_AddData(this.h, data_alias)
 }

diff --git a/qt/cbor/gen_qcborstreamwriter.go b/qt/cbor/gen_qcborstreamwriter.go
@@ -74,7 +74,11 @@ func (this *QCborStreamWriter) AppendWithQCborNegativeInteger(n QCborNegativeInt
 
 func (this *QCborStreamWriter) AppendWithBa(ba []byte) {
 	ba_alias := C.struct_miqt_string{}
-	ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	if len(ba) > 0 {
+		ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	} else {
+		ba_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	ba_alias.len = C.size_t(len(ba))
 	C.QCborStreamWriter_AppendWithBa(this.h, ba_alias)
 }

diff --git a/qt/cbor/gen_qcborvalue.go b/qt/cbor/gen_qcborvalue.go
@@ -190,7 +190,11 @@ func NewQCborValue8(st QCborSimpleType) *QCborValue {
 // NewQCborValue9 constructs a new QCborValue object.
 func NewQCborValue9(ba []byte) *QCborValue {
 	ba_alias := C.struct_miqt_string{}
-	ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	if len(ba) > 0 {
+		ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	} else {
+		ba_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	ba_alias.len = C.size_t(len(ba))
 
 	return newQCborValue(C.QCborValue_new9(ba_alias))
@@ -540,7 +544,11 @@ func QCborValue_FromCbor(reader *QCborStreamReader) *QCborValue {
 
 func QCborValue_FromCborWithBa(ba []byte) *QCborValue {
 	ba_alias := C.struct_miqt_string{}
-	ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	if len(ba) > 0 {
+		ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	} else {
+		ba_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	ba_alias.len = C.size_t(len(ba))
 	_goptr := newQCborValue(C.QCborValue_FromCborWithBa(ba_alias))
 	_goptr.GoGC() // Qt uses pass-by-value semantics for this type. Mimic with finalizer
@@ -607,7 +615,11 @@ func (this *QCborValue) TaggedValue1(defaultValue *QCborValue) *QCborValue {
 
 func (this *QCborValue) ToByteArray1(defaultValue []byte) []byte {
 	defaultValue_alias := C.struct_miqt_string{}
-	defaultValue_alias.data = (*C.char)(unsafe.Pointer(&defaultValue[0]))
+	if len(defaultValue) > 0 {
+		defaultValue_alias.data = (*C.char)(unsafe.Pointer(&defaultValue[0]))
+	} else {
+		defaultValue_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	defaultValue_alias.len = C.size_t(len(defaultValue))
 	var _bytearray C.struct_miqt_string = C.QCborValue_ToByteArray1(this.h, defaultValue_alias)
 	_ret := C.GoBytes(unsafe.Pointer(_bytearray.data), C.int(int64(_bytearray.len)))
@@ -652,7 +664,11 @@ func (this *QCborValue) ToUuid1(defaultValue *qt.QUuid) *qt.QUuid {
 
 func QCborValue_FromCbor22(ba []byte, error *QCborParserError) *QCborValue {
 	ba_alias := C.struct_miqt_string{}
-	ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	if len(ba) > 0 {
+		ba_alias.data = (*C.char)(unsafe.Pointer(&ba[0]))
+	} else {
+		ba_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	ba_alias.len = C.size_t(len(ba))
 	_goptr := newQCborValue(C.QCborValue_FromCbor22(ba_alias, error.cPointer()))
 	_goptr.GoGC() // Qt uses pass-by-value semantics for this type. Mimic with finalizer
@@ -1027,7 +1043,11 @@ func (this *QCborValueRef) ToDouble1(defaultValue float64) float64 {
 
 func (this *QCborValueRef) ToByteArray1(defaultValue []byte) []byte {
 	defaultValue_alias := C.struct_miqt_string{}
-	defaultValue_alias.data = (*C.char)(unsafe.Pointer(&defaultValue[0]))
+	if len(defaultValue) > 0 {
+		defaultValue_alias.data = (*C.char)(unsafe.Pointer(&defaultValue[0]))
+	} else {
+		defaultValue_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	defaultValue_alias.len = C.size_t(len(defaultValue))
 	var _bytearray C.struct_miqt_string = C.QCborValueRef_ToByteArray1(this.h, defaultValue_alias)
 	_ret := C.GoBytes(unsafe.Pointer(_bytearray.data), C.int(int64(_bytearray.len)))

diff --git a/qt/gen_qabstractbutton.go b/qt/gen_qabstractbutton.go
@@ -1304,7 +1304,11 @@ func miqt_exec_callback_QAbstractButton_HideEvent(self *C.QAbstractButton, cb C.
 
 func (this *QAbstractButton) callVirtualBase_NativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 
 	return (bool)(C.QAbstractButton_virtualbase_NativeEvent(unsafe.Pointer(this.h), eventType_alias, message, (*C.long)(unsafe.Pointer(result))))

diff --git a/qt/gen_qabstracteventdispatcher.go b/qt/gen_qabstracteventdispatcher.go
@@ -160,7 +160,11 @@ func (this *QAbstractEventDispatcher) RemoveNativeEventFilter(filterObj *QAbstra
 
 func (this *QAbstractEventDispatcher) FilterNativeEvent(eventType []byte, message unsafe.Pointer, result *int64) bool {
 	eventType_alias := C.struct_miqt_string{}
-	eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	if len(eventType) > 0 {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(&eventType[0]))
+	} else {
+		eventType_alias.data = (*C.char)(unsafe.Pointer(nil))
+	}
 	eventType_alias.len = C.size_t(len(eventType))
 	return (bool)(C.QAbstractEventDispatcher_FilterNativeEvent(this.h, eventType_alias, message, (*C.long)(unsafe.Pointer(result))))
 }