GetPreviewBitmapFile保存具有奇怪颜色的预览位图（SolidWorks）

Question

I'm developing C# VSTA macro for our manufacturing department. I'm using SldWorks.GetPreviewBitMapFile to save a bitmap preview of the selected model and show it in the picturebox as shown below:

The code looks fine and execute fine except for the strange colors:

bool status = swApp.GetPreviewBitmapFile(filepath, configuration, "D:\\preview.bmp");
            pictureBox1.ImageLocation = "D:\\Preview.bmp";
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            pictureBox1.Refresh();

Has anyone had a similar problem and what's the remedy?

Answer 1

Here is an example of working code:

//to compare output
iSwApp.GetPreviewBitmapFile(@"c:\Path\Part1.SLDPRT", "Default", @"c:\Path\Part1_0.bmp");

object com = iSwApp.GetPreviewBitmap(@"c:\Path\Part1.SLDPRT", "Default");
stdole.StdPicture pic = com as stdole.StdPicture;
Bitmap bmp = Bitmap.FromHbitmap((IntPtr)pic.Handle);
bmp.Save(@"c:\Path\Part1_1.bmp");

There are few notes about GetPreviewBitmap from SW API:

• Currently only in-process applications (that is, macros or add-ins) can use this method; out-of-process applications (that is, executables) will get an automation error because the IPictureDisp interface cannot be marshalled across process boundaries. This is a Microsoft behavior by design. See the Microsoft Knowledge Base for details.
• This method is not supported in macros or out-of-process applications in SolidWorks x64.

I was able to make it work in SolidWorks x64 only in .NET add-in and in VBA macros. Let me know if you need add-in example.

Answer 2

An update for SW2016. The GetPreviewBitmapFile function works for an out-of-process Csharp console program. However, the colors of the generated bitmap are very strange. It turns out the only valid solution is to use the SaveBmp function.