lazarus - Free Pascal 之 文件处理

今儿来写写如何使用Free Pascal处理文件，感觉挺有用的

任务一：写hello world到文件

1 procedure TForm1.Button1Click(Sender: TObject);
2 var
3   f: TextFile;
4 begin
5    AssignFile(f, 'hello.txt');
6    ReWrite(f);
7    Write(f, 'hello world');
8    CloseFile(f);
9 end;

任务二：写0x00-0xff的二进制数据到文件

 1 procedure TForm1.Button1Click(Sender: TObject);
 2 var
 3   f: file of byte;
 4   i: integer;
 5 begin
 6    AssignFile(f, 'hello.txt');
 7    ReWrite(f);
 8 
 9    for i:= 0 to $ff do
10    begin
11         Write(f, i);
12    end;
13 
14    CloseFile(f);
15 end; 

任务三：写0x00-0xff到文件，每个数字占用4字节

 1 procedure TForm1.Button1Click(Sender: TObject);
 2 var
 3   f: file of longWord;
 4   i: integer;
 5 begin
 6    AssignFile(f, 'hello.txt');
 7    ReWrite(f);
 8 
 9    for i:= 0 to $ff do
10    begin
11         Write(f, i);
12    end;
13 
14    CloseFile(f);
15 end; 

总结

到这里你就已经很牛逼了