Windows Form App With Inline Assembly Code - c++-cli

Question

I am very confused and frustrated, I am in an assembly programming class and am tasked with modifying an example from the textbook for one on my assignment problems. The example is a simple string encrypter which uses inline assembly to modify characters from an input string one-by-one and print it back out in another textbox within a windows form.
I wrote everything exactly as it is in the text and no dice Visual Studio will not build it and tons of build errors are thrown. I don't understand what I am doing wrong, and it is frustrating when I cannot practically apply something that is demonstrated in the text.
Here is the example code:
Windows Form Data Encryption
And here is what I have which is in the header file .h that is part of the form design:
#pragma once
char EncryptionKey = 0x45;
char Encrypt(char code)
{
_asm
{
mov a1, code
xor a1, EncryptionKey
mov code, a1
mov a1, EncryptionKey
inc a1
and a1, 7fh
mov EncryptionKey, a1
}
return code;
}
namespace TextEncryter {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
/// <summary>
/// Summary for Form1
///
/// WARNING: If you change the name of this class, you will need to change the
/// 'Resource File Name' property for the managed resource compiler tool
/// associated with all .resx files this class depends on. Otherwise,
/// the designers will not be able to interact properly with localized
/// resources associated with this form.
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ Encrypt;
protected:
private: System::Windows::Forms::RichTextBox^ richTextBox1;
private: System::Windows::Forms::RichTextBox^ richTextBox2;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::Label^ label2;
protected:
private:
/// <summary>
/// Required designer variable.
/// </summary>
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->Encrypt = (gcnew System::Windows::Forms::Button());
this->richTextBox1 = (gcnew System::Windows::Forms::RichTextBox());
this->richTextBox2 = (gcnew System::Windows::Forms::RichTextBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->label2 = (gcnew System::Windows::Forms::Label());
this->SuspendLayout();
//
// Encrypt
//
this->Encrypt->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 9.75F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->Encrypt->Location = System::Drawing::Point(197, 249);
this->Encrypt->Name = L"Encrypt";
this->Encrypt->Size = System::Drawing::Size(75, 23);
this->Encrypt->TabIndex = 0;
this->Encrypt->Text = L"Encrypt";
this->Encrypt->UseVisualStyleBackColor = true;
this->Encrypt->Click += gcnew System::EventHandler(this, &Form1::Encrypt_Click);
//
// richTextBox1
//
this->richTextBox1->Location = System::Drawing::Point(13, 22);
this->richTextBox1->Name = L"richTextBox1";
this->richTextBox1->Size = System::Drawing::Size(259, 96);
this->richTextBox1->TabIndex = 1;
this->richTextBox1->Text = L"";
//
// richTextBox2
//
this->richTextBox2->Location = System::Drawing::Point(13, 138);
this->richTextBox2->Name = L"richTextBox2";
this->richTextBox2->Size = System::Drawing::Size(259, 96);
this->richTextBox2->TabIndex = 2;
this->richTextBox2->Text = L"";
//
// label1
//
this->label1->AutoSize = true;
this->label1->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 9.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->label1->Location = System::Drawing::Point(13, 3);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(36, 16);
this->label1->TabIndex = 3;
this->label1->Text = L"Input";
this->label1->Click += gcnew System::EventHandler(this, &Form1::label1_Click);
//
// label2
//
this->label2->AutoSize = true;
this->label2->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 9.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->label2->Location = System::Drawing::Point(10, 121);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(98, 16);
this->label2->TabIndex = 4;
this->label2->Text = L"Encrypted Text";
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(284, 284);
this->Controls->Add(this->label2);
this->Controls->Add(this->label1);
this->Controls->Add(this->richTextBox2);
this->Controls->Add(this->richTextBox1);
this->Controls->Add(this->Encrypt);
this->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
*private: System::Void Encrypt_Click(System::Object^ sender, System::EventArgs^ e)
{
richTextBox1->Text = "";
for (int a = 0; a < textBox1->Text->Length; a++)
{
richTextBox1->Text += Convert::ToChar(Encrypt(textBox1->Text[a]));
}
}*
};
}
I am using Visual Studio 2008 Express. When I try and use a newer version of visual studio windows forms are based on C# and not C++ and I can't even get it to build as far as in 2008. The main errors that are thrown are:
1> Inline native assembly not supported in managed code
error C3862: 'Encrypt': cannot compile an unmanaged function with /clr:pure or /clr:safe
C2227: left of '->Text' must point to class/struct/union/generic type
1> type is ''unknown-type''
Do I maybe need to put the char Encrypt function within the .ccp source file that belongs to the project? Any help would be greatly appreciated.