编辑:
看起来这是一个文件大小的问题。我正在处理的文件大小为10600 x 700像素。这最终成为了一个约280 MB的位图。我已经尝试将明显小得多的文件大小(10x10)保存为PNG格式,它们能够正确保存。是否存在GDI+所达到的大小限制?
几乎完整的代码:
class Converter
{
/* Each PNG below is 50x50 */
private static readonly int BLOCK_SIZE = 50;
private static Dictionary<char, Bitmap> BlockLookup => new Dictionary<char, Bitmap>
{
{'R', new Bitmap("Content/Map/Blocks/RedBlock.png")},
{'G', new Bitmap("Content/Map/Blocks/GreenBlock.png")},
{'B', new Bitmap("Content/Map/Blocks/BlueBlock.png")},
{'P', new Bitmap("Content/Map/Blocks/PurpleBlock.png")},
{'Y', new Bitmap("Content/Map/Blocks/YellowBlock.png")},
{'O', new Bitmap("Content/Map/Blocks/OrangeBlock.png")}
};
public void Convert(string textFilePath, string outputDirectory)
{
List<string> fileContents = new List<string>();
/* Irrelevant loading code snipped, loads text file into fileContents */
int width = fileContents.Max(line => line.Length) * BLOCK_SIZE; // 10600
int height = fileContents.Count * BLOCK_SIZE; // 700
/* Try to convert our text-file-as-image into a real image, mapping chars to their blocks */
using (Bitmap bitmap = new Bitmap(width, height))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.Clear(Color.WhiteSmoke);
graphics.SmoothingMode = SmoothingMode.AntiAlias;
for (int y = 0; y < fileContents.Count; ++y)
{
for (int x = 0; x < fileContents[y].Length; ++x)
{
char currentCharacter = fileContents[y][x];
if (!blockLookup.ContainsKey(currentCharacter))
{
continue;
}
Bitmap mapBlock = blockLookup[currentCharacter];
var mapX = x * BLOCK_SIZE;
var mapY = y * BLOCK_SIZE;
graphics.DrawImage(mapBlock, new Point(mapX, mapY));
}
}
graphics.Flush(FlushIntention.Sync);
graphics.Save();
}
if (!Directory.Exists(outputDirectory))
{
Directory.CreateDirectory(outputDirectory);
}
bitmap.Save(outputDirectory + mapName, ImageFormat.Png);
}
}
}
我有以下代码:
using (Bitmap bitmap = new Bitmap(width, height))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.Clear(Color.WhiteSmoke);
/* SNIP, a bunch of image manipulation here */
graphics.Flush();
}
if (!Directory.Exists(outputDirectory))
{
Directory.CreateDirectory(outputDirectory);
}
bitmap.Save(outputDirectory + imageName, ImageFormat.Bmp);
}
这段代码工作得很好。但是,如果我将ImageFormat从ImageFormat.Bmp更改为ImageFormat.Png,就会收到“在GDI+中发生通用错误”的错误消息。我在stackoverflow和谷歌上搜寻过了。文件不存在,路径存在。我已经删除了所有输出文件。我尝试了64位和32位构建。即使像复制Bitmap并写入内存流这样的操作也失败了(下面的代码不起作用):
using (Bitmap bitmap = new Bitmap(width, height))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.Clear(Color.WhiteSmoke);
/* SNIP, a bunch of image manipulation here */
graphics.Flush();
}
if (!Directory.Exists(outputDirectory))
{
Directory.CreateDirectory(outputDirectory);
}
using (MemoryStream memoryStream = new MemoryStream())
{
Bitmap temp = new Bitmap(bitmap);
temp.Save(memoryStream, ImageFormat.Png);
}
}
我希望能够输出PNG文件。然而,我不知道我的GDI版本与PNG文件是否存在某些问题。有没有什么方法可以使我得到PNG输出?