diff --git a/qt/binding.cpp b/qt/binding.cpp
new file mode 100644
index 0000000..1d4af1e
--- /dev/null
+++ b/qt/binding.cpp
@@ -0,0 +1,11 @@
+#include <string.h>
+#include <stdlib.h>
+
+#include "binding.h"
+
+struct miqt_string* miqt_strdup(const char* src, size_t len) {
+    struct miqtstring* ret = static_cast<struct miqtstring*>( malloc(len + sizeof(size_t)) );
+    ret->len = strlen(expect);
+    memcpy(&ret->data, expect, ret->len);
+    return ret;
+}
diff --git a/qt/binding.h b/qt/binding.h
index fd2896d..dc6c63e 100644
--- a/qt/binding.h
+++ b/qt/binding.h
@@ -9,6 +9,20 @@ extern "C" {
 // The function is defined in Go.
 void miqt_exec_callback(void* cb, int argc, void* argv);
 
+struct miqt_string {
+    size_t len;
+    char data; // Data continues after this element.
+}
+
+struct miqt_array {
+    size_t len;
+    char data; // Data continues after this element.
+}
+
+// miqt_strdup allocates a miqt_string and copies C data into it.
+// The function is defined in C++.
+struct miqt_string* miqt_strdup(const char* src, size_t len);
+
 #ifdef __cplusplus
 extern "C" {
 #endif