Difficulty with WebView

[noclass1980]

Hi, need some advice on the following problem:
I wanted to create a pdf from a table that wasn't produced using a database. Erel suggested I look at the DBUtils and borrow some code from the ExecuteHTML sub. In the attached, I have been able to generate an HTML table from my table data and open a WebView with the table data showing; so far, so good. The problem is then creating a BitMap from the WebView - the WebView.CaptureBitmap returns a NULLPOINTER exception. Other posts suggested the format might be:

dim img as BitMap
img.initialize3(WebView1.CaptureBitMap)

and I've also seen

img=WebView1.CaptureBitMap

but both cause the NULLPOINTER problem. I also tried to initialize the image bitmap with a bitmap file and the replacing it with CaptureBitMap approach but that didn't work either.

if the Bitmap is initialised with an image file, the pdfwriter part of the code successfully saves the image as a pdf so the problem appears to lie somewhere around line 158 with the WebView1.CaptureBitMap code. Would be grateful for any suggestions. Thanks.

 

[Erel]

Can you post the full error message from the logs?

 

[noclass1980]

It doesn't really show an error message on the logs as I remember, just the red NULLPOINTER message in the local variables and the app pauses during running in debug mode. I can't run the app tonight so will post it midday(ish) tomorrow. Thanks for looking though.

 

[noclass1980]

webview erro log

Hi, I've run the app again with the same failure at line 156. I've attached a copy of the log for information. I don't know if this is relevant but the second line of the nullpointer error log is:

at anywheresoftware.b4a.samples.dbutils.main._pdfbutton_click(main.java:792)

I had the dbutils module inserted in the app during the early development but then deleted it after I'd used the code in dbutils.ExecuteHTML in the main module in sub "pdfbutton_Click" so could the missing module be the cause?

I look forward to your comments. Thanks

 

[Erel]

Seems like WebView is not yet ready. You should use the WebView PageFinished event and save the bitmap there.

 

[noclass1980]

Seems like WebView is not yet ready. You should use the WebView PageFinished event and save the bitmap there.

ok, I'll try that. Is the Webview_PageFinished event automatically raised when it's finished? and should I use

pdfimage.InitializeMutable(WebView1.width, WebView1.height) pdfimage=WebView1.CaptureBitmap

or

pdfimage.Initialize3(WebView1.CaptureBitmap)

thanks for the prompt response.

 

[Erel]

WebView.CaptureBitmap returns a bitmap. You do not need to do any initialization yourself:

Dim bmp As Bitmap = WebView1.CaptureBitmap

 

[noclass1980]

WebView.CaptureBitmap returns a bitmap. You do not need to do any initialization yourself:

Dim bmp As Bitmap = WebView1.CaptureBitmap

That works very well now although I had to use the CaptureTimer_Tick in this

URL]

thread because if I put the pdfwriter code in the Page_Finished sub I got an Out of Memory error. Thank you very much for the help.