some fix

Author: jinzhongjia

examples/call_zig_from_js/main.zig

@@ -8,8 +8,10 @@ const html = @embedFile("index.html");
 pub fn main() !void {
     var nwin = try webui.newWindow();
 
-    _ = try nwin.bind("my_function_string", my_function_string);
-    _ = try nwin.bind("my_function_integer", my_function_integer);
+    _ = try nwin.binding("my_function_string", getString);
+    // _ = try nwin.bind("my_function_string", my_function_string);
+    _ = try nwin.binding("my_function_integer", getInteger);
+    // _ = try nwin.bind("my_function_integer", my_function_integer);
     _ = try nwin.bind("my_function_boolean", my_function_boolean);
     _ = try nwin.bind("my_function_with_response", my_function_with_response);
     _ = try nwin.bind("my_function_raw_binary", my_function_raw_binary);
@@ -21,6 +23,13 @@ pub fn main() !void {
     webui.clean();
 }
 
+fn getString(str1: [:0]const u8, str2: [:0]const u8) void {
+    // Hello
+    std.debug.print("my_function_string 1: {s}\n", .{str1});
+    // World
+    std.debug.print("my_function_string 2: {s}\n", .{str2});
+}
+
 fn my_function_string(e: *webui.Event) void {
     // JavaScript:
     // my_function_string('Hello', 'World`);
@@ -35,6 +44,12 @@ fn my_function_string(e: *webui.Event) void {
     std.debug.print("my_function_string 2: {s}\n", .{str_2});
 }
 
+fn getInteger(n1: i64, n2: i64, n3: i64, f1: f64) void {
+    std.debug.print("number is {},{},{},{}", .{
+        n1, n2, n3, f1,
+    });
+}
+
 fn my_function_integer(e: *webui.Event) void {
     // JavaScript:
     // my_function_integer(123, 456, 789, 12345.6789);
@@ -95,7 +110,7 @@ fn my_function_raw_binary(e: *webui.Event) void {
 
     // Or e.getStringAt(0);
     const raw_1 = e.getString();
-    const raw_2 = e.getStringAt(1);
+    const raw_2 = e.getRawAt(1);
 
     // Or e.getSizeAt(0);
     const len_1 = e.getSize() catch return;

examples/custom_spa_server_on_free_port/main.zig

@@ -1,4 +1,5 @@
 //! Custom web Server - Free Port - Example
+// Note: if you want to run this example, you nedd a python, zig will wrap a child process to launch python server
 const std = @import("std");
 const webui = @import("webui");
 

src/c.zig

@@ -895,6 +895,16 @@ pub extern fn webui_return_string(e: *Event, s: [*:0]const u8) callconv(.C) void
 /// @example webui_return_bool(e, true);
 pub extern fn webui_return_bool(e: *Event, b: bool) callconv(.C) void;
 
+/// @brief Get the last WebUI error code.
+///
+/// @example int error_num = webui_get_last_error_number();
+pub extern fn webui_get_last_error_number() callconv(.C) c_int;
+
+/// @brief Get the last WebUI error message.
+///
+/// @example const char* error_msg = webui_get_last_error_message();
+pub extern fn webui_get_last_error_message() callconv(.C) [*:0]const u8;
+
 // -- Wrapper's Interface -------------
 
 /// @brief Bind a specific HTML element click event with a function. Empty element means all events.