bitmap.save函数gdi错误 [英] bitmap.save function gdi error

问题描述

我有2个代码.
1.这是预览:

I have 2 code.
1. This is for preview :

Bitmap gambarBaru = new Bitmap(picOriginal.Image);
Graphics gfxGambar = Graphics.FromImage(gambarBaru);
Size sizeGambar = picOriginal.Image.Size;
Rectangle rctGambr = new Rectangle(new Point(0,0),sizeGambar);
ImageAttributes attrGambar = new ImageAttributes();
attrGambar.SetColorMatrix(colorTransformer, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
gfxGambar.DrawImage(picOriginal.Image, rctGambr, 0, 0, sizeGambar.Width, sizeGambar.Height, GraphicsUnit.Pixel, attrGambar);
attrGambar.Dispose();
gfxGambar.Dispose();
picAfter.Image = gambarBaru;
string apploc = System.IO.Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).ToString();
gambarBaru.Save(apploc + "\\config.png");

此代码可以成功运行.一会儿，
2.转换代码:

This code can run successfully. While,
2. The code for conversion :

private Bitmap TransformImage(Bitmap originalImage)
{
Bitmap gambarBaru = new Bitmap(originalImage.Width, originalImage.Height);  
Graphics gfxGambar = Graphics.FromImage(gambarBaru);
Size sizeGambar = gambarBaru.Size;
Rectangle rctGambr = new Rectangle(new Point(0, 0), originalImage.Size);
ImageAttributes attrGambar = new ImageAttributes();
attrGambar.SetColorMatrix(colorTransformer, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
gfxGambar.DrawImage(originalImage, rctGambr, 0, 0, sizeGambar.Width, sizeGambar.Height, GraphicsUnit.Pixel, attrGambar);
attrGambar.Dispose();
gfxGambar.Dispose();
return gambarBaru;
}
        
private void ColorizeImageFile(string imagePath, string TargetImagePath, ImageFormat format)
{
Bitmap originalBitmap = new Bitmap(imagePath, true);
Bitmap targetBitmap = TransformImage(originalBitmap);
originalBitmap.Dispose();
targetBitmap.Save(TargetImagePath,ImageFormat.Png);
}

此代码始终会引发GDI错误异常.错误发生在targetBitmap上.有人知道为什么会这样吗?

this code always throw GDI error exception. The error is on targetBitmap. Anyone knows why is this happen?

推荐答案

这是一个熟悉的问题.如果要使用PNG格式保存图像，则需要将位图保存到MemoryStream对象，并使用FileStream
将MemoryStream写入硬盘.
祝你好运，

爱德华

This is a familiar problem. If you want to save the image using the PNG format, you need to save the bitmap to a MemoryStream object and write that MemoryStream to your harddrive using a FileStream

Good Luck,

Eduard

最后，我知道了造成此问题的原因.它位于TargetImagePath上.在代码#1上，路径总是正确形成的(实际上并非总是:D).代码#2，必须提供正确格式的路径.就我而言，我只是希望Bitmap.Save()仅创建文件夹(如果尚未创建).这是错误的原因.您必须使用Directory.CreateDirectory()手动创建文件夹(如果尚不存在)

At last, I know the causes of this problem. It''s on the TargetImagePath. On the code #1, the path always formed properly (actually not always :D). The code #2, you must supply the correctly formed path. In my case, I just expect Bitmap.Save() to just create the folder if not already created. This is the cause of error. You must create the folder manually using Directory.CreateDirectory() if not already present

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