Create safe_length.c

strings/safe_length.c

@@ -0,0 +1,37 @@
+#include <windows.h>
+#include <strsafe.h>
+#include <wchar.h>
+
+int wmain(void) { 
+
+    wchar_t str[] = L"ZetCode";
+    size_t target_size = 0;
+
+    size_t size = sizeof(str);
+
+    HRESULT r = StringCbLengthW(str, size, &target_size);
+    
+    if (SUCCEEDED(r)) {
+
+        wprintf(L"The string has %lld bytes\n", target_size);
+    } else {
+
+        wprintf(L"StringCbLengthW() failed\n"); 
+        return 1;
+    }
+
+    size = sizeof(str)/sizeof(wchar_t);
+
+    r = StringCchLengthW(str, size, &target_size);
+    
+    if (SUCCEEDED(r)) {
+
+        wprintf(L"The string has %lld characters\n", target_size);
+    } else {
+
+        wprintf(L"StringCchLengthW() failed\n"); 
+        return 1;
+    }
+
+    return 0;
+}