c#,winform，启动时Application.Run(new Form1())报错

Question

winform的图如下

报错信息如下，抛出了Win32Exception

窗体代码如下

 public partial class Form1 : Form
    {
        [DllImport("C:\\Users\\Dell-pc\\Desktop\\ConsoleApplication1\\Debug\\ConsoleApplication1.dll")]
        protected static extern bool BeginHook();

        [DllImport("C:\\Users\\Dell-pc\\Desktop\\ConsoleApplication1\\Debug\\ConsoleApplication1.dll")]
        protected static extern bool FinishHook();

        string str="";

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            BeginHook();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            FinishHook();
        }

        protected override void WndProc(ref System.Windows.Forms.Message msg)
        {
            str = str + msg.WParam + "\n";
            label1.Text = str;
        }
    }

这里导入了自己写的dll
dll的cpp文件代码

 #include "stdafx.h"
#include "ConsoleApplication1.h"
#include <windows.h>


HMODULE hThisDllModule;

#pragma data_seg("test")
HHOOK hHook=NULL;
HWND hMainWindow=NULL;
#pragma data_seg()

LRESULT CALLBACK  HandleHookMessage(int nCode, WPARAM wParam, LPARAM lParam)
{
    PostMessage(hMainWindow, nCode, wParam, lParam);
    return ::CallNextHookEx(hHook, nCode, wParam, lParam);
}


CONSOLEAPPLICATION1_API BOOL WINAPI BeginHook()
{

    hHook=::SetWindowsHookEx(WH_KEYBOARD, HandleHookMessage, hThisDllModule, 0);
    return true;

}



CONSOLEAPPLICATION1_API BOOL WINAPI FinishHook()
{
    return ::UnhookWindowsHookEx(hHook);
}

dll的h文件

 #ifdef CONSOLEAPPLICATION1_EXPORTS
#define CONSOLEAPPLICATION1_API __declspec(dllexport)
#else
#define CONSOLEAPPLICATION1_API __declspec(dllimport)
#endif

CONSOLEAPPLICATION1_API BOOL WINAPI BeginHook();

CONSOLEAPPLICATION1_API BOOL WINAPI FinishHook();

用了def文件

 LIBRARY
   EXPORTS 
       BeginHook
       FinishHook

   SECTIONS
       test Read Write Shared  

代码如上，这个应该是窗体代码中有哪里出错了所以启动不了窗体，但是我看不出哪里出错了，求大神指点指点

Answer 1

protected override void WndProc(ref System.Windows.Forms.Message msg)
{
str = str + msg.WParam + "\n";
label1.Text = str;
}

->
protected override void WndProc(ref System.Windows.Forms.Message msg)
{
str = str + msg.WParam + "\n";
label1.Text = str;
return base.WndProc(msg);
}