Preview error handle

src/ShimLib/ShimLib.c

@@ -120,7 +120,15 @@ const size_t Col = 140;
 
 const char* FRAME_FILE_PATH_1 = "./img1_v2.bin";
 const char* FRAME_FILE_PATH_2 = "./pre_image.bin";
+
+int previewCount = 0;
 const char* GetPreviewData() {
+    previewCount++;
+    if (previewCount>3){
+        status = READY;
+        innerCallback("22222");
+        return NULL;
+    }
 	FILE* file;
 	preivew_change_flag++;
 	preivew_change_flag = preivew_change_flag % 2;

src/components/DateSlidePickerBox.cpp

@@ -6,7 +6,7 @@
 #include <QHBoxLayout>
 #include <QLabel>
 #include <QDate>
-DateSlidePickerBox::DateSlidePickerBox(QWidget *parent) {
+DateSlidePickerBox::DateSlidePickerBox(QWidget *parent):QWidget(parent) {
     layout = new QHBoxLayout(this);
     myear = new SlidePickerBox(this);
     QStringList centry;

src/device/DeviceManager.cpp

@@ -164,7 +164,9 @@ void DeviceManager::initDevice() {
 			if (inf.status == SCANNING) {
 				qDebug() << "Preview data reader read start!";
 				const char* data = GetPreviewData();
-				if (!data)continue;
+				if (!data){
+				    continue;
+				}
 				qDebug() << "Preview data reader read end!";
 				QByteArray bytes = QByteArray::fromRawData(data, 140 * 140);
 				//double check

src/forms/scan/ScanFormWidget.cpp

@@ -258,9 +258,11 @@ ScanFormWidget::ScanFormWidget(QWidget* parent) : TabFormWidget(parent) {
 		lbl_e2->setText(tr("some settings\n\nparameters\n"));
 		});
 
+    connect(EventCenter::Default(), &EventCenter::DeviceErrorRaise, [=](QObject* parent, QObject* msg){
+        setPreviewing(false);
+    });
 
-
+    previewfunc = [=](bool val)->void {
-	previewfunc = [=](bool val)->void {
 		viewer->setVisible(val);
 		btnPreview->setCheckable(val);
 		btnPreview->setChecked(val);