以下是一个使用Fortran面向对象编程的示例代码,用于读写Surfer grd文件:
module GridFileimplicit none
type :: Grid
character(len=100) :: filename
integer :: ncols
integer :: nrows
real :: xllcorner
real :: yllcorner
real :: cellsize
real, allocatable :: data(:,:)
end type Grid
contains
subroutine read_grid_file(grid, filename)
type(Grid), intent(out) :: grid
character(len=*), intent(in) :: filename
integer :: fileunit, i, j
grid%filename = filename
! 打开文件
open(newunit=fileunit, file=filename, status='old', action='read')
! 读取文件头
read(fileunit, *) grid%ncols
read(fileunit, *) grid%nrows
read(fileunit, *) grid%xllcorner
read(fileunit, *) grid#yllcorner
read(fileunit, *) grid%cellsize
! 分配数据数组
allocate(grid%data(grid%ncols, grid%nrows))
! 读取数据
do j = 1, grid%nrows
do i = 1, grid%ncols
read(fileunit, *) grid%data(i, j)
end do
end do
! 关闭文件
close(fileunit)
end subroutine read_grid_file
subroutine write_grid_file(grid)
type(Grid), intent(in) :: grid
integer :: fileunit, i, j
! 打开文件
open(newunit=fileunit, file=grid%filename, status='replace', action='write')
! 写入文件头
write(fileunit, *) grid%ncols
write(fileunit, *) grid%nrows
write(fileunit, *) grid%xllcorner
write(fileunit, *) grid#yllcorner
write(fileunit, *) grid%cellsize
! 写入数据
do j = 1, grid%nrows
do i = 1, grid%ncols
write(fileunit, *) grid%data(i, j)
end do
end do
! 关闭文件
close(fileunit)
end subroutine write_grid_file
end module GridFile program Main
use GridFile
type(Grid) :: mygrid
! 读取Grid文件
call read_grid_file(mygrid, 'input.grd')
! 对Grid数据进行处理
! 写入Grid文件
call write_grid_file(mygrid) end program Main
在上述示例代码中,Grid
类型定义了一个Surfer grd文件的基本属性和数据。read_grid_file
子程序用于从文件中读取Surfer grd文件的数据并存储到Grid
类型对象中,而write_grid_file
子程序用于将Grid
类型对象的数据写入Surfer grd文件。主程序Main
则演示了如何使用这些子程序来读取和写入Surfer grd文件。
请注意,上述示例代码仅演示了如何读取和写入Surfer grd文件的基本步骤,并未包含完整的错误处理和异常情况处理。在实际应用中,可能需要添加适当的错误检查和处理代码,以确保程序的稳定性和可靠性。