start/stop zcashd.exe on windows

src/connection.cpp

@@ -146,9 +146,18 @@ bool ConnectionLoader::startEmbeddedZcashd() {
     // Finally, start zcashd    
     qDebug() << "Starting zcashd";
     QFileInfo fi(Settings::getInstance()->getExecName());
-    auto zcashdProgram = fi.dir().filePath("zcashd");
+#ifdef Q_OS_LINUX
+    auto zcashdProgram = "zcashd";
+#elif defined(Q_OS_DARWIN)
+    auto zcashdProgram = "zcashd";
+#else
+    auto zcashdProgram = "zcashd.exe";
+#endif
+    
+    qDebug() << zcashdProgram << QFile(zcashdProgram).exists();
 
     ezcashd = new QProcess(main);    
+    ezcashd->setWorkingDirectory(fi.dir().absolutePath());
     QObject::connect(ezcashd, &QProcess::started, [=] () {
         qDebug() << "zcashd started";
         Settings::getInstance()->setEmbeddedZcashdRunning(true);
@@ -160,7 +169,7 @@ bool ConnectionLoader::startEmbeddedZcashd() {
     });
 
     QObject::connect(ezcashd, &QProcess::errorOccurred, [&] (auto error) mutable {
-        qDebug() << "Couldn't start zcashd: " << error;
+        qDebug() << "Couldn't start zcashd: " << error << ezcashd->errorString();
     });
 
     ezcashd->start(zcashdProgram);

src/main.cpp

@@ -20,6 +20,7 @@ int main(int argc, char *argv[])
 
     std::srand(std::time(nullptr));
     Settings::init();
+    Settings::getInstance()->setExecName(argv[0]);
 
     if (argc >= 2 && QString::fromStdString(argv[1]) == "-manual") {
         Settings::getInstance()->setManualConnection(true);

src/rpc.cpp

@@ -839,6 +839,9 @@ void RPC::shutdownZcashd() {
     d.setWindowFlags(Qt::SplashScreen);
 
     QTimer waiter(main);
+
+    // We capture by reference all the local variables because of the d.exec() 
+    // below, which blocks this function until we exit. 
     QObject::connect(&waiter, &QTimer::timeout, [&] () {
         if (ezcashd->atEnd()) {
             qDebug() << "Ended";