Fix: improve QProcess usage for Qt6 compatibility

- Refactored QProcess::start() calls in parseEDID() to use the modern
  API by separating program name and arguments instead of shell string concatenation.
- Added return value validation for waitForFinished() to
  handle process execution failures gracefully.
- Applied QString::fromLocal8Bit() to standard output reading to
  ensure proper text encoding handling.
- These changes improve code robustness, security (avoiding shell injection risks),
  and compatibility with Qt6 best practices.

Log: fix issue
Bug: https://pms.uniontech.com/bug-view-353603.html

Author: GongHeng2017

deepin-devicemanager/src/Tool/commontools.cpp

@@ -198,12 +198,17 @@ void CommonTools::parseEDID(const QStringList &allEDIDS, const QString &input, b
         QString edidStr;
         if (isHW) {
             QProcess process;
-            process.start(QString("hexdump %1").arg(edid));
-            process.waitForFinished(-1);
+            process.start("hexdump", QStringList() << edid);
+            if (!process.waitForFinished(3000)) {
+                qCritical() << "Failed to hexdump edid file!";
+                continue;
+            }
 
-            QString deviceInfo = process.readAllStandardOutput();
-            if (deviceInfo.isEmpty())
+            QString deviceInfo = QString::fromLocal8Bit(process.readAllStandardOutput());
+            if (deviceInfo.isEmpty()) {
+                qWarning() << "The edid file is empty! " << edid;
                 continue;
+            }
 
             QStringList lines = deviceInfo.split("\n");
             for (auto line:lines) {
@@ -218,11 +223,16 @@ void CommonTools::parseEDID(const QStringList &allEDIDS, const QString &input, b
             }
         } else {
             QProcess process;
-            process.start(QString("hexdump -C %1").arg(edid));
-            process.waitForFinished(-1);
-            QString deviceInfo = process.readAllStandardOutput();
-            if (deviceInfo.isEmpty())
+            process.start("hexdump", QStringList() << "-C" << edid);
+            if (!process.waitForFinished(3000)) {
+                qCritical() << "Failed to hexdump edid file!";
                 continue;
+            }
+            QString deviceInfo = QString::fromLocal8Bit(process.readAllStandardOutput());
+            if (deviceInfo.isEmpty()) {
+                qWarning() << "The edid file is empty! " << edid;
+                continue;
+            }
 
             QStringList lines = deviceInfo.split("\n");
             for (auto line: lines) {