added new examples

8 files changed, 176 insertions, 0 deletions

diff --git a/Binary_files/BinaryFiles_Cheatsheet.pdf b/Binary_files/BinaryFiles_Cheatsheet.pdf
new file mode 100644
index 0000000..397177c
--- /dev/null
+++ b/Binary_files/BinaryFiles_Cheatsheet.pdf
diff --git a/Binary_files/GetStructsFromBinaryFile.cpp b/Binary_files/GetStructsFromBinaryFile.cpp
new file mode 100644
index 0000000..011629a
--- /dev/null
+++ b/Binary_files/GetStructsFromBinaryFile.cpp
@@ -0,0 +1,47 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+struct test
+{
+	char ch;
+	int num;
+};
+
+int GetFileSize(ifstream& ifs)
+{
+	ifs.seekg(0, std::ios::end); //отиваме в края на файла
+	int size = ifs.tellg(); //запазваме коя е текущата позиция(тя всъщност е и размерът на файла)
+	ifs.seekg(0, std::ios::beg); //връщаме се в началото на файла  
+	return size;
+//тази функция е хубаво да я извикваме преди да сме чели каквото и да е от файла, понеже ще се върнем в началото и ще загубим информация до къде сме стигнали с четенето
+}
+
+ 
+int main()
+{
+	std::ifstream inF("Structs.bat", std::ios::binary);
+
+	if (!inF.is_open())
+		return false;
+
+	int fileSize = GetFileSize(inF); // взимаме големината на файла
+	int objectCount = fileSize / sizeof(test); // намираме броя на обектите записани във файла
+
+	test* arr = new test[objectCount];
+
+	inF.read((char*)arr, fileSize); //директно ги четем в масива
+
+	if (!inF)
+	{
+		cout << "Error occurred while reading from the file";
+		return 1;
+	}
+	inF.close();
+
+	for (int i = 0; i < objectCount; i++)
+		cout << arr[i].ch << " " << arr[i].num << endl;
+	delete[] arr;
+
+	return 0;
+}
\ No newline at end of file
diff --git a/Binary_files/README.md b/Binary_files/README.md
new file mode 100644
index 0000000..f740e9f
--- /dev/null
+++ b/Binary_files/README.md
@@ -0,0 +1,5 @@
+# How does the binary file look like?
+The file after running  **SaveStructsToBinaryFile.cpp** or **SaveStructsToBinaryFile(as array).cpp**
+
+![Image of the binary file after running the code](https://lh3.googleusercontent.com/NcLcTEemBj6dMkOFFjUPo2jyR_7vdrUkn0dHqx8TX1CYmtW-XZzSaDwAxscJz0m3EnniPL68ag "Binary file")
+
diff --git a/Binary_files/SaveAndReadStudents_BinaryFile.cpp b/Binary_files/SaveAndReadStudents_BinaryFile.cpp
new file mode 100644
index 0000000..0f600aa
--- /dev/null
+++ b/Binary_files/SaveAndReadStudents_BinaryFile.cpp
@@ -0,0 +1,47 @@
+#include <iostream>
+#include <fstream>
+
+using namespace std;
+void SaveStudent(const char* name, int fn, ofstream& f)
+{
+	 f.write((const char*)&fn, sizeof(int)); //sizeof(int) is 4
+	 int strLen = strlen(name);
+	 f.write((const char*)&strLen,sizeof(int));
+	 f.write(name, strLen);
+}
+void ReadStudent(ifstream& f)
+{
+	 int fn;
+	 f.read((char*)&fn, sizeof(int));
+
+	 int nameLen;
+	 f.read((char*)&nameLen, sizeof(int));
+
+	 char* name = new char[nameLen + 1];
+	 f.read(name, nameLen);
+	 name[nameLen] = '\0';
+
+ 	cout << "Name: " << name << " Fn: " << fn << endl;
+	 delete[] name;
+
+}
+
+
+
+int main()
+{
+ //ofstream f;
+ // f.open("students.bat");
+ // SaveStudent("Ivan",123,f);
+ // SaveStudent("Sasho",555,f);
+ // f.close();
+
+ //ifstream f2;
+ //f2.open("students.bat");
+ //ReadStudent(f2);
+ //ReadStudent(f2);
+ //f2.close();
+ 
+
+
+}
diff --git a/Binary_files/SaveStructsToBinaryFile(as array).cpp b/Binary_files/SaveStructsToBinaryFile(as array).cpp
new file mode 100644
index 0000000..146a93c
--- /dev/null
+++ b/Binary_files/SaveStructsToBinaryFile(as array).cpp
@@ -0,0 +1,37 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+struct test
+{
+	char ch;
+	int num;
+};
+
+int main()
+{
+
+	test arr[] = { { 'a', 4 }, { 'b', 5 }, { 'c', 6 } };
+
+	ofstream outF("Structs.bat", ios::binary);
+
+	if (!outF.is_open())
+	{
+		cout << "Error while opening file" << endl;
+		return 1;
+	}
+
+	outF.write((const char*)&arr, sizeof(arr)); 
+	//можем директно да запазим масива във файла. Резултатът ще същия като от SaveStructToBinaryFile.cpp
+	
+
+	if (!outF.good()) 
+	{
+		cout << "Error occurred while writing the file";
+		return 1;
+	}
+
+	outF.close();
+
+	return 0;
+}
\ No newline at end of file
diff --git a/Binary_files/SaveStructsToBinaryFile.cpp b/Binary_files/SaveStructsToBinaryFile.cpp
new file mode 100644
index 0000000..3caad14
--- /dev/null
+++ b/Binary_files/SaveStructsToBinaryFile.cpp
@@ -0,0 +1,40 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+struct test
+{
+	char ch;
+	int num;
+};
+
+int main()
+{
+
+	test obj1{ 'a', 4 };
+	test obj2{ 'b', 5 };
+	test obj3{ 'c', 6 };
+
+	ofstream outF("Structs.bat", ios::binary);
+
+	if (!outF.is_open())
+	{
+		cout << "Error while opening file"<<endl;
+		return 1;
+	}
+	
+	//запазваме 3-те обекта във файла
+	outF.write((const char*)&obj1, sizeof(test));
+	outF.write((const char*)&obj2, sizeof(test));
+	outF.write((const char*)&obj3, sizeof(test));
+
+	if (!outF.good()) // проверяваме дали след операцията потокът е в невалидено състояние
+	{
+		cout<<"Error occurred while writing the file";
+		return 1;
+	}
+	
+	outF.close();
+
+	return 0;
+}
\ No newline at end of file
diff --git a/Binary_files/Structs.bat b/Binary_files/Structs.bat
new file mode 100644
index 0000000..37573c8
--- /dev/null
+++ b/Binary_files/Structs.bat
diff --git a/Binary_files/StructsBAT (how does it look).png b/Binary_files/StructsBAT (how does it look).png
new file mode 100644
index 0000000..5e9e5b3
--- /dev/null
+++ b/Binary_files/StructsBAT (how does it look).png