Add backtraces to examples (#5973)

* examples: Log stack trace on exceptions

For now, this is only implemented on Windows.
This helps to address #5520.

* examples: Print log file if there is any

* format code

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/examples/example-winmain/main.cpp b/examples/example-winmain/main.cpp
new file mode 100644
index 000000000..8094e7fc4
--- /dev/null
+++ b/examples/example-winmain/main.cpp
@@ -0,0 +1,28 @@
+#include "../stacktrace-windows/common.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+
+extern int exampleMain(int argc, char** argv);
+extern const char* const g_logFileName;
+
+int WinMain(
+    HINSTANCE /* instance */,
+    HINSTANCE /* prevInstance */,
+    LPSTR /* commandLine */,
+    int /*showCommand*/)
+
+{
+    FILE* logFile = fopen(g_logFileName, "w");
+    __try
+    {
+        int argc = 0;
+        char** argv = nullptr;
+        return exampleMain(argc, argv);
+    }
+    __except (exceptionFilter(logFile, GetExceptionInformation()))
+    {
+        ::exit(1);
+    }
+}