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Code stops working after adding if statements.

Cyclone (118)
Hi. I have a bunch of checkboxes used to write different values to a file. The checkBox1 control does what it's supposed to. But when I add another checkBox45 to the code it stops working. Any ideas?

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Hi. I have a bunch of checkboxes used to write different values to a file. The checkBox1 control does what it's supposed to. But when I add another checkBox to the code it stops working. Any ideas?

[code]
 int Write_Bytes(int Bytes_To_write, int N_Bytes, int location, std::string File_Path_Music)
	   {
		   ofstream fout;
		   fout.open(File_Path_Music, ios_base::out | ios_base::in | ios_base::binary);
		   fout.seekp(location); // The position in the file to write the bytes to.
		   fout.write((char*)&Bytes_To_write, N_Bytes); //  N_Bytes is the number of bytes to write.
		   fout.close();
		   return 0;
	   }

	  

private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
	int location = 0;
	int N_Bytes = 1;
	int Bytes_To_write;

	if (Bytes_To_write > 255) { N_Bytes = 2; }
	else { N_Bytes = 1; }

	std::string File_Path_Music;

	try {
		
		OpenFileDialog^ openFileDialog1 = gcnew OpenFileDialog;
		//openFileDialog1->InitialDirectory = "c:\\";
		openFileDialog1->Filter = "Text Files|*.txt|All Files|*.*";
		openFileDialog1->FilterIndex = 1;
		openFileDialog1->RestoreDirectory = true;


		if (openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK)
		{
			using namespace msclr::interop;
			System::String^ managedString = openFileDialog1->FileName; // This creates a managed String
			File_Path_Music = marshal_as<std::string>(managedString); // This converts to a Standard string
		}

	}
	catch (...) {}



	
	// The Below changes the music pointer
///////////////////////////////////////////////////////////////////////////////////////////////// checkBox1 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	
		if (checkBox1_Song_ID == 1)
		{
			location = 0x3983e2;
				Bytes_To_write = 0x8582;
				Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 2)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8589;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 3)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x86FC;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 4) 
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8703;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);

			location = 0x398703 + 1; 
			Bytes_To_write = 0x00;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);

		}
		if (checkBox1_Song_ID == 5)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8908;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}


		if (checkBox1_Song_ID == 6)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x89F0;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}

		if (checkBox1_Song_ID == 7)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8A84;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}

		if (checkBox1_Song_ID == 8)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8B75;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 9)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8BC1;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 10)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8C16;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 11)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8C59;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 12) 
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8CE8;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 13)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8D5F;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 14)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8DC3;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		 if (checkBox1_Song_ID == 15)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8E61;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 16) 
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8E1B;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 17)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8FB4;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 18)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x9015;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 19)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x901C;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}


		// The Below Changes the index of the music. not the pointer.
		// It will change all instences of the specified music.



		if (checkBox1_Song_ID == 22)  
		{

			location = 0x398703 + 1;
			Bytes_To_write = 0x17;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}

		if (checkBox1_Song_ID == 23) 
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x14;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 24)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x16;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 25)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x1A;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 26)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x11;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 27)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x19;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 28)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x12;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 29)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x0C;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 30) 
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x0A;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 31) 
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x09;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		if (checkBox1_Song_ID == 32)
		{
			location = 0x398703 + 1;
			Bytes_To_write = 0x0F;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}

		if (checkBox1_Song_ID >= 22)
		{
			location = 0x3983e2;
			Bytes_To_write = 0x8703;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}
		////////////////////////////////////////////////////////////////////////////////////  checkBox45   /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// this below statement stops the code above from working


		if (checkBox2_Song_ID == 7)
		{
			location = 0x3983c2;
			Bytes_To_write = 0x8A84;
			Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
		}


[/code]
Last edited on
seeplus (6598)
Well the first thought is that what you are writing into memory is either wrong or at the wrong address....

When you start writing data direct to memory all bets are off...

PS.Note that this is C++/cli code...
Last edited on
Cyclone (118)
The addresses are correct. I tested them individually. It’s just when I add another check box to the mix things stop working.
jonnin (11442)
I don't see any reason, but this is growing too big for this approach.
try making a vector of tuples with say <location, byte_address>
so you can just say write_bytes(...myvector[checkbox_ID]...) one time. That is, eliminate all the if statements and assignments entirely...

what does stop working mean, exactly?
did you verify that checkBox2_Song_ID is == 7 and step through with the debugger? what happens in the debugger for 7, anything weird, or like it skips that code block, or ???
deleted account xyzzy (5768)
So many if statements that could be pared down to a switch statement or two....

Lots less verbose, easier to read and understand, with a switch than a "billion" ifs.

https://www.learncpp.com/cpp-tutorial/switch-statement-basics/

jonnin's approach is a lot better, though, really. Preconfigure a container with the known/used locations/byte addresses and a single call with the song ID.

deleted account xyzzy (5768)
Cyclone wrote:
The addresses are correct. I tested them individually. It’s just when I add another check box to the mix things stop working.

Could it be a mistyped address for the 2nd check box?
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	if (checkBox1_Song_ID == 7)
	{
		location       = 0x3983e2;
		Bytes_To_write = 0x8A84;
		Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
	}

	if (checkBox2_Song_ID == 7)
	{
		location       = 0x3983c2;  // <-- you sure about that address?
		Bytes_To_write = 0x8A84;
		Write_Bytes(Bytes_To_write, N_Bytes, location, File_Path_Music);
	}

A 'c' instead of an 'e' is a very easy typo to make, and hard to spot after beating one's head on a desk for a while.
Cyclone (118)
That wasn’t the problem. I checked the code in a hex editor and found out that the incorrect number of bytes were being written.
Thanks for the help.
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