Delphi：如何在 cmd 命令中将变量作为参数提供

Question

Instead of passing a number as parameter. I want to pass a variable for the IP-address. How can I do this? I've already tried the + operator but it didnt worked.

ShellExecute(
    Application.handle, 
    'open', 
    'cmd.exe', 
    PChar('/c "mysqldump -h 192.168.100.1 -uroot database table > C:/Users/user1/Desktop/export.sql"'), 
    nil, 
    SW_show
);

Answer 1

If I've correctly understood your question, you are looking for something to compose the command string using variables. You can do that in several ways, this is one (Using the Format function):

var
  IPAddress : string;
begin
  IPAddress := '192.168.100.1';

  ShellExecute(
    Application.Handle,
    'open',
    'cmd.exe',
    PChar(Format('/c "mysqldump -h %s -uroot database table > C:/Users/user1/Desktop/export.sql"', [IPAddress])),
    nil,
    SW_SHOW
  );
end;