从c#文本框到win32 c++程序读取困难

本文关键字：程序 读取 c++ win32 文本 | 更新日期: 2023-09-27 18:07:56

我正试图从我创建的c#形式中读取并将其传递给我的win32应用程序。问题是我总是得到一个空字符串，而不是从文本框中获取文本。我从我的c++程序中创建了一个对c#表单dll文件的引用。我知道问题是在c#部分，因为我调试了它，发现它本身从来没有从文本中获得值。因为这是我第一次使用c#，我不知道什么是错误的，我粘贴我的c#代码下面。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace UpdaterForm
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void label1_Click(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Close();
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            this.Text=textBox1.Text;
        }
        public String textbox1
        {
            get{
                  return textBox1.Text;
            }
        }

        public String textbox2
        {
            get
            {
                return textBox2.Text;
            }
        }
        public String textbox3
        {
            get
            {
                return textBox3.Text;
            }
        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace UpdaterForm
{
    public class UpdaterForm
    {
        public string PickText( )
        {
            Form1 form = new Form1();
            String text1;
            String text2;
            String text3;
            Application.Run(form);
            text1 = form.textbox1;
            text2 = form.textbox2;
            text3 = form.textbox3;
            form.Dispose();
            string text = text1 + "." + text2 + "." + text3;
            return text;
        }
    }
}
下面是c++代码 
#include <string>
class UpdaterFormClient
{
 private:
    void* ref;
    void alloc();
    void free();
    wchar_t * pick();
 public:
    UpdaterFormClient();
    ~UpdaterFormClient();
    void picker(std::wstring &);
};
CPP文件 
#include <windows.h>
#include "UpdaterFormClient.h"
#include <vcclr.h>
using namespace System;
using namespace System::Runtime::InteropServices;
#pragma unmanaged
UpdaterFormClient::UpdaterFormClient()
{
 alloc();
}
UpdaterFormClient::~UpdaterFormClient()
{
 free();
}
void UpdaterFormClient::picker(std::wstring &text1)
{
 wchar_t *p;
 p = pick();
 text1 = p;
 delete [] p;
}
#pragma managed
#using <mscorlib.dll>
#using <..''..''UpdaterForm''UpdaterForm''bin''debug''UpdaterForm.dll>
void UpdaterFormClient::alloc()
{
 GCHandle gch;
 UpdaterForm::UpdaterForm ^obj;
 obj = gcnew UpdaterForm::UpdaterForm();
 gch = GCHandle::Alloc(obj);
 ref = GCHandle::ToIntPtr(gch).ToPointer();
 return;
}
void UpdaterFormClient::free()
{
 IntPtr temp(ref);
 GCHandle gch;
 gch = static_cast<GCHandle>(temp);
 gch.Free();
}
wchar_t * UpdaterFormClient::pick()
{
 IntPtr temp(ref);
 String ^text1;
 wchar_t *ret;
 GCHandle gch;
 UpdaterForm::UpdaterForm ^obj;
 gch = static_cast<GCHandle>(temp);
 obj = static_cast<UpdaterForm::UpdaterForm ^>(gch.Target);
 text1 = obj->PickText();
 ret = new wchar_t[text1->Length + 1];
 interior_ptr<const wchar_t> p1 = PtrToStringChars(text1);
 pin_ptr<const wchar_t> p2 = p1;
 wcscpy_s(ret, text1->Length + 1, p2);
 return ret;
}

从c#文本框到win32 c++程序读取困难

Windows程序无法正常运行

您启动一个应用程序循环Application.Run(form)，然后，当它结束时，您尝试获取文本框值。

你不能在Windows程序中这样做。

Application.Run(form)将阻塞，直到窗口关闭或消息循环结束。

因此，您需要将处理文本框的代码移到表单中。

在表单上放置一个按钮，并将文本框代码放入按钮单击事件中。使用消息框。显示调用以显示输入的内容。

我试图在这里演示这一点(您需要更深入地解释c++部分):

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
namespace UpdaterForm 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
        } 
        private void Form1_Load(object sender, EventArgs e) 
        { 
        } 
        private void label1_Click(object sender, EventArgs e) 
        { 
        } 
        private void button1_Click(object sender, EventArgs e) 
        { 
            String text1 = textBox1.Text;  
            String text2 = textBox2.Text;  
            String text3 = textBox3.Text;  
            string text = text1 + "." + text2 + "." + text3; 
            MessageBox.Show(text);           
        } 
    } 
} 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
namespace UpdaterForm 
{ 
    public class UpdaterForm 
    { 
        public string PickText( ) 
        { 
            Form1 form = new Form1(); 
            try {
              Application.Run(form); 
            } finally {
              form.Dispose();
            } 
        } 
    } 
}
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