修正大量demo

screenwidget/main.cpp

@@ -1,9 +1,8 @@
 #pragma execution_character_set("utf-8")
 
-#include "screenwidget.h"
+#include "frmscreenwidget.h"
 #include <QApplication>
 #include <QTextCodec>
-#include <QIcon>
 
 int main(int argc, char *argv[])
 {
@@ -24,7 +23,9 @@ int main(int argc, char *argv[])
     QTextCodec::setCodecForLocale(codec);
 #endif
 
-    ScreenWidget::Instance()->showFullScreen();
+    frmScreenWidget w;
+    w.setWindowTitle("屏幕截图");
+    w.show();
 
     return a.exec();
 }