Improved error reporting.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39667 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/print/drivers/gutenprint/GPBinding.cpp

@@ -186,21 +186,26 @@ GPBinding::EndPage() throw(TransportException)
 {
 	status_t status = fJob.PrintPage(fBands);
 	DeleteBands();
-	if (status != B_OK)
+	if (status == B_IO_ERROR)
 		throw TransportException("I/O Error");
+	if (status == B_ERROR) {
+		BString message;
+		fJob.GetErrorMessage(message);
+		throw TransportException(message.String());
+	}
 }
 
 
-void
+status_t
 GPBinding::AddBitmapToPage(BBitmap* bitmap, BRect validRect, BPoint where)
 {
 	GPBand* band = new(nothrow) GPBand(bitmap, validRect, where);
 	if (band == NULL) {
-		// TODO report error
-		return;
+		return B_NO_MEMORY;
 	}
 
 	fBands.push_back(band);
+	return B_OK;
 }
 
 
@@ -210,8 +215,9 @@ GPBinding::InitGutenprint()
 	if (fInitialized)
 		return;
 	fInitialized = true;
-	// TODO make sure this creates no memory leaks,
-	// as there is no "destroy" counter part
+	// there is no "destroy" counter part so this creates memory leaks
+	// this is no problem because the print server loads printer add-ons
+	// in a new application instance that is terminated when not used anymore
 	stp_init();
 	stp_set_output_codeset("UTF-8");
 }

src/add-ons/print/drivers/gutenprint/GPBinding.h

@@ -48,7 +48,7 @@ public:
 	void		EndJob() throw(TransportException);
 	void		BeginPage() throw(TransportException);
 	void		EndPage() throw(TransportException);
-	void		AddBitmapToPage(BBitmap* bitmap, BRect validRect, BPoint where);
+	status_t	AddBitmapToPage(BBitmap* bitmap, BRect validRect, BPoint where);
 
 private:
 	void		InitGutenprint();

src/add-ons/print/drivers/gutenprint/GPDriver.cpp

@@ -207,6 +207,7 @@ GPDriver::endPage(int)
 		return true;
 	}
 	catch (TransportException& err) {
+		ShowError(err.what());
 		return false;
 	} 
 }
@@ -220,6 +221,7 @@ GPDriver::endDoc(bool)
 		return true;
 	}
 	catch (TransportException& err) {
+		ShowError(err.what());
 		return false;
 	} 
 }
@@ -261,25 +263,25 @@ GPDriver::nextBand(BBitmap* bitmap, BPoint* offset)
 
 			x = rc.left;
 			y += rc.top;
-/*
-			int width = rc.right - rc.left + 1;
-			int height = rc.bottom - rc.top + 1;
-			int delta = bitmap->BytesPerRow();
 
-			DBGMSG(("width = %d\n", width));
-			DBGMSG(("height = %d\n", height));
-			DBGMSG(("delta = %d\n", delta));
-			DBGMSG(("renderobj->get_pixel_depth() = %d\n", fHalftone->getPixelDepth()));
-*/
 			int width = rc.right - rc.left + 1;
 			int height = rc.bottom - rc.top + 1;
 			fprintf(stderr, "GPDriver nextBand x %d, y %d, width %d,"
 				" height %d\n",
 				x, y, width, height);
 			BRect imageRect(rc.left, rc.top, rc.right, rc.bottom);
-			fBinding.AddBitmapToPage(bitmap, imageRect, BPoint(x, y));
+			status_t status;
+			status = fBinding.AddBitmapToPage(bitmap, imageRect, BPoint(x, y));
+			if (status == B_NO_MEMORY) {
+				ShowError("Out of memory");
+				return false;
+			} else if (status != B_OK) {
+				ShowError("Unknown error");
+				return false;
+			}
+
 		} else {
-			DBGMSG(("band bitmap is clean.\n"));
+			DBGMSG(("band bitmap is empty.\n"));
 		}
 
 		if (y >= page_height) {
@@ -292,8 +294,19 @@ GPDriver::nextBand(BBitmap* bitmap, BPoint* offset)
 		return true;
 	}
 	catch (TransportException& err) {
-		BAlert* alert = new BAlert("", err.what(), "OK");
-		alert->Go();
+		ShowError(err.what());
 		return false;
 	} 
 }
+
+
+void
+GPDriver::ShowError(const char* message)
+{
+	BString text;
+	text << "An error occurred attempting to print with Gutenprint:";
+	text << "\n";
+	text << message;
+	BAlert* alert = new BAlert("", text.String(), "OK");
+	alert->Go();
+}

src/add-ons/print/drivers/gutenprint/GPDriver.h

@@ -42,6 +42,7 @@ protected:
 	bool		nextBand(BBitmap* bitmap, BPoint* offset);
 	bool		endPage(int page);
 	bool		endDoc(bool success);
+	void		ShowError(const char* message);
 
 private:
 	GPBinding		fBinding;

src/add-ons/print/drivers/gutenprint/GPJob.cpp

@@ -19,7 +19,7 @@ GPJob::GPJob()
 	fVariables(NULL),
 	fBands(NULL),
 	fCachedBand(NULL),
-	fWriteError(B_OK)
+	fStatus(B_OK)
 {
 	fImage.init = ImageInit;
 	fImage.reset = ImageReset;
@@ -61,7 +61,7 @@ GPJob::SetOutputStream(OutputStream* outputStream)
 status_t
 GPJob::Begin()
 {
-	fWriteError = B_OK;
+	fStatus = B_OK;
 
 	stp_init();
 
@@ -217,8 +217,8 @@ from72dpi(int value, int toUnit)
 
 status_t
 GPJob::PrintPage(list<GPBand*>& bands) {
-	if (fWriteError != B_OK)
-		return fWriteError;
+	if (fStatus != B_OK)
+		return fStatus;
 
 	fPrintRect = GetPrintRectangle(bands);
 	fBands = &bands;
@@ -304,7 +304,14 @@ GPJob::PrintPage(list<GPBand*>& bands) {
 
 	stp_print(fVariables, &fImage);
 
-	return fWriteError;
+	return fStatus;
+}
+
+
+void
+GPJob::GetErrorMessage(BString& message)
+{
+	message = fErrorMessage;
 }
 
 
@@ -356,7 +363,7 @@ GPJob::Height()
 stp_image_status_t
 GPJob::GetRow(unsigned char* data, size_t size, int row)
 {
-	if (fWriteError != B_OK)
+	if (fStatus != B_OK)
 		return STP_IMAGE_STATUS_ABORT;
 
 	// row is relative to left, top of image
@@ -454,7 +461,7 @@ GPJob::Write(const char* data, size_t size)
 	try {
 		fOutputStream->Write(data, size);
 	} catch (TransportException e) {
-		fWriteError = B_IO_ERROR;
+		fStatus = B_IO_ERROR;
 	}
 }
 
@@ -462,8 +469,9 @@ GPJob::Write(const char* data, size_t size)
 void
 GPJob::ReportError(const char* data, size_t size)
 {
-	// TODO report error in printer add-on
-	fprintf(stderr, "GPJob Gutenprint Error: %*s\n", (int)size, data);
+	if (fStatus == B_OK)
+		fStatus = B_ERROR;
+	fErrorMessage.Append(data, size);
 }
 
 

src/add-ons/print/drivers/gutenprint/GPJob.h

@@ -34,6 +34,8 @@ public:
 
 	status_t	PrintPage(list<GPBand*>& bands);
 
+	void		GetErrorMessage(BString& message);
+
 private:
 	BRect	GetPrintRectangle(list<GPBand*>& bands);
 	GPBand*	FindBand(int line);
@@ -75,6 +77,7 @@ private:
 	BRect					fPrintRect;
 	list<GPBand*>*			fBands;
 	GPBand*					fCachedBand;
-	status_t				fWriteError;
+	status_t				fStatus;
+	BString					fErrorMessage;
 };
 #endif