cls
[void][System.Reflection.Assembly]::LoadWithPartialName('System.Drawing')

#判断文件编码的函数
function Get-FileCoder($file_path){
	$bytes = [System.IO.File]::ReadAllBytes($file_path)
	if($bytes[0] -eq 0xff -and $bytes[1] -eq 0xfe){ return 'utf-16_le' }
	if($bytes[0] -eq 0xfe -and $bytes[1] -eq 0xff){ return 'utf-16_be' }
	if($bytes[0] -eq 0xef -and $bytes[1] -eq 0xbb -and $bytes[2] -eq 0xbf){ return 'utf-8_bom' }
	$index = 0; $bu8 = $false
	while($index -lt $bytes.Count){
		$one = 0
		for($i = 0; $i -lt 8; $i++){
			if(($bytes[$index] -band (0x80 -shr $i)) -eq 0){ break; }
			++$one
		}
		if($one -eq 0){
			++$index
		} else {
			if($one -eq 1){ return 'ansi' }
			$bu8 = $true
			for($i = 0; $i -lt $one-1; $i++){
				++$index
				if(($bytes[$index] -band 0x80) -ne 0x80){ return 'ansi' }
			}
			++$index
		}
	}
	if($bu8){return 'utf-8'} else { return 'ansi'}
}

#字体
$font_size = 20
$font_family = 'Courier New'
$font = New-Object 'System.Drawing.Font'(([System.Drawing.FontFamily]::Families | Where-Object { $_.Name -eq $font_family } | Select-Object -First 1),$font_size)
#画刷
$black_brush = New-Object 'System.Drawing.SolidBrush'([System.Drawing.Color]::Black)
$white_brush = New-Object 'System.Drawing.SolidBrush'([System.Drawing.Color]::White)


#遍历txt
[void][System.IO.Directory]::CreateDirectory('png')
Get-ChildItem '*.txt' | foreach {
    Write-Host $_.FullName
    #读取文字
    $cp = Get-FileCoder -file_path $_.FullName
    Write-Host $cp
    $lines = $null
    if($cp -eq 'utf-8'){
		$lines = Get-Content -Encoding UTF8 -Path $_.FullName
    } elseif ( $cp -eq 'ansi'){
		$lines = Get-Content -Encoding Default -Path $_.FullName
    } elseif ( $cp -eq 'utf-16_le'){
		$lines = Get-Content -Encoding Unicode -Path $_.FullName
    } elseif ( $cp -eq 'utf-16_be'){
		$lines = Get-Content -Encoding BigEndianUnicode -Path $_.FullName
    } elseif ( $cp -eq 'utf-8_bom'){
		$lines = Get-Content -Encoding UTF8 -Path $_.FullName
    }
    #计算宽高
    $max_c = 0
    $lines | foreach { 
        $len = ([System.Text.UnicodeEncoding]::Unicode.GetBytes($_)|Where-Object{ $_ -ne 0 }).Count
        if($max_c -lt $len){ $max_c = $len} 
    }
    $w = $max_c*$font_size+20
    $h = $lines.Count*2*$font_size+20
    #创建图片和画布
    $bmp = New-Object 'System.Drawing.Bitmap'($w,$h)
    $g = [System.Drawing.Graphics]::FromImage($bmp)
    #画白色背景
    $g.FillRectangle($white_brush,0,0,$w,$h)
    #画文字
    $y0 = 5
    $x0 = 5
    $lines | foreach {
        $g.DrawString($_,$font,$black_brush,$x0,$y0)
        $y0 += $font_size*2
    }
    #保存图片
    [void]$g.Save()
    $bmp.Save('.\png\' + $_.BaseName + '.png',[System.Drawing.Imaging.ImageFormat]::Png)
    '.\png\' + $_.BaseName + '.png'
    '------------------------'
}
pause
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