/* Use syncronous call to ghostscript to get the
* number of pages in a PDF file */
public int GetPageCount(String fileName)
{
gsParamState_t gsparams = new gsParamState_t();
gsParamState_t result;
gsparams.args = new List <string>();
gsparams.args.Add("gs");
gsparams.args.Add("-dNODISPLAY");
gsparams.args.Add("-dNOPAUSE");
gsparams.args.Add("-dBATCH");
gsparams.args.Add("-I%rom%Resource/Init/");
//gsparams.args.Add("-q");
gsparams.args.Add("-sFile=\"" + fileName + "\"");
gsparams.args.Add("--permit-file-read=\"" + fileName + "\"");
gsparams.args.Add("-c");
gsparams.args.Add("\"File (r) file runpdfbegin pdfpagecount = quit\"");
gsparams.task = GS_Task_t.GET_PAGE_COUNT;
m_params = gsparams;
result = gsFileSync(gsparams);
if (result.result == GS_Result_t.gsOK)
{
return(m_params.num_pages);
}
else
{
return(-1);
}
}
/* Close the display device and delete the instance */
public gsParamState_t DisplayDeviceClose()
{
int code = 0;
gsParamState_t out_params = new gsParamState_t();
out_params.result = GS_Result_t.gsOK;
try
{
int code1 = GSAPI.gsapi_exit(dispInstance);
if ((code == 0) || (code == gsConstants.E_QUIT))
{
code = code1;
}
GSAPI.gsapi_delete_instance(dispInstance);
dispInstance = IntPtr.Zero;
}
catch (Exception except)
{
gsErrorReport("Exception: " + except.Message);
out_params.result = GS_Result_t.gsFAILED;
}
return(out_params);
}
/* Launch a thread rendering a set of pages with the display device. For use with languages
* that can be indexed via pages which include PDF and XPS */
public gsStatus gsDisplayDeviceRenderPages(String fileName, int first_page, int last_page, double zoom)
{
gsParamState_t gsparams = new gsParamState_t();
int format = (gsConstants.DISPLAY_COLORS_RGB |
gsConstants.DISPLAY_DEPTH_8 |
gsConstants.DISPLAY_LITTLEENDIAN);
int resolution = (int)(72.0 * zoom + 0.5);
gsparams.args = new List <string>();
gsparams.args.Add("gs");
gsparams.args.Add("-dNOPAUSE");
gsparams.args.Add("-dBATCH");
gsparams.args.Add("-I%rom%Resource/Init/");
gsparams.args.Add("-dSAFER");
gsparams.args.Add("-r" + resolution);
gsparams.args.Add("-sDEVICE=display");
gsparams.args.Add("-dDisplayFormat=" + format);
gsparams.args.Add("-dFirstPage=" + first_page);
gsparams.args.Add("-dLastPage=" + last_page);
gsparams.args.Add("-f");
gsparams.args.Add(fileName);
gsparams.task = GS_Task_t.DISPLAY_DEV_PDF;
gsparams.currpage = first_page - 1;
m_params.currpage = first_page - 1;
return(RunGhostscriptAsync(gsparams));
}
/* Launch a thread rendering all the pages with the display device
* to collect thumbnail images or full resolution. */
public gsStatus gsDisplayDeviceRenderAll(String fileName, double zoom, bool aa, GS_Task_t task)
{
gsParamState_t gsparams = new gsParamState_t();
int format = (gsConstants.DISPLAY_COLORS_RGB |
gsConstants.DISPLAY_DEPTH_8 |
gsConstants.DISPLAY_BIGENDIAN);
int resolution = (int)(72.0 * zoom + 0.5);
gsparams.args = new List <string>();
gsparams.args.Add("gs");
gsparams.args.Add("-dNOPAUSE");
gsparams.args.Add("-dBATCH");
gsparams.args.Add("-I%rom%Resource/Init/");
gsparams.args.Add("-dSAFER");
gsparams.args.Add("-r" + resolution);
if (aa)
{
gsparams.args.Add("-dTextAlphaBits=4");
gsparams.args.Add("-dGraphicsAlphaBits=4");
}
gsparams.args.Add("-sDEVICE=display");
gsparams.args.Add("-dDisplayFormat=" + format);
gsparams.args.Add("-f");
gsparams.args.Add(fileName);
gsparams.task = task;
gsparams.currpage = 0;
m_params.currpage = 0;
return(RunGhostscriptAsync(gsparams));
}
/* Callback as worker progresses in run string case */
private void gsProgressChanged(gsParamState_t Params, int percent)
{
/* Callback with progress */
gsThreadCallBack info = new gsThreadCallBack(false, percent, Params);
Gtk.Application.Invoke(delegate {
ProgressCallBack(info);
});
}
/* Callback upon worker all done */
private void gsCompleted(gsParamState_t Params)
{
gsThreadCallBack info = new gsThreadCallBack(true, 100, Params);
m_worker_busy = false;
Gtk.Application.Invoke(delegate {
ProgressCallBack(info);
});
}
/* Call the appropriate worker thread based upon the task
* that we have to do */
private gsStatus RunGhostscriptAsync(gsParamState_t Params)
{
try
{
if (m_worker_busy)
{
return(gsStatus.GS_BUSY);
}
switch (Params.task)
{
case GS_Task_t.PS_DISTILL:
m_worker = new Thread(gsBytesAsync);
break;
case GS_Task_t.DISPLAY_DEV_NON_PDF:
case GS_Task_t.DISPLAY_DEV_PDF:
case GS_Task_t.DISPLAY_DEV_THUMBS_NON_PDF:
case GS_Task_t.DISPLAY_DEV_THUMBS_PDF:
m_worker = new Thread(DisplayDeviceAsync);
break;
case GS_Task_t.SAVE_RESULT:
case GS_Task_t.CREATE_XPS:
default:
m_worker = new Thread(gsFileAsync);
break;
}
var arguments = new List <object>();
arguments.Add(Params);
arguments.Add(this);
m_worker_busy = true;
m_worker.Start(arguments);
return(gsStatus.GS_READY);
}
catch (OutOfMemoryException)
{
Console.WriteLine("Memory allocation failed during gs rendering\n");
return(gsStatus.GS_ERROR);
}
}
/* Launch a thread rendering all the pages with the display device
* to distill an input PS file and save as a PDF. */
public gsStatus DistillPS(String fileName, int resolution)
{
gsParamState_t gsparams = new gsParamState_t();
gsparams.args = new List <string>();
gsparams.inputfile = fileName;
gsparams.args.Add("gs");
gsparams.args.Add("-dNOPAUSE");
gsparams.args.Add("-dBATCH");
gsparams.args.Add("-I%rom%Resource/Init/");
gsparams.args.Add("-dSAFER");
gsparams.args.Add("-sDEVICE=pdfwrite");
gsparams.outputfile = Path.GetTempFileName();
gsparams.args.Add("-o" + gsparams.outputfile);
gsparams.task = GS_Task_t.PS_DISTILL;
return(RunGhostscriptAsync(gsparams));
}
public gsThreadCallBack(bool completed, int progress, gsParamState_t param)
{
m_completed = completed;
m_progress = progress;
m_param = param;
}
/* Worker task for using display device */
private void DisplayDeviceAsync(object data)
{
int code = 0;
List <object> genericlist = data as List <object>;
gsParamState_t gsparams = (gsParamState_t)genericlist[0];
gsParamState_t Result = gsparams;
GCHandle argPtrsStable = new GCHandle();
int num_params = gsparams.args.Count;
var argParam = new GCHandle[num_params];
var argPtrs = new IntPtr[num_params];
List <byte[]> CharacterArray = new List <byte[]>(num_params);
bool cleanup = true;
gsparams.result = GS_Result_t.gsOK;
try
{
code = GSAPI.gsapi_new_instance(out dispInstance, IntPtr.Zero);
if (code < 0)
{
throw new GhostscriptException("DisplayDeviceAsync: gsapi_new_instance error");
}
code = GSAPI.gsapi_set_stdio(dispInstance, stdin_callback, stdout_callback, stderr_callback);
if (code < 0)
{
throw new GhostscriptException("DisplayDeviceAsync: gsapi_set_stdio error");
}
code = GSAPI.gsapi_set_arg_encoding(dispInstance, (int)gsEncoding.GS_ARG_ENCODING_UTF8);
if (code < 0)
{
throw new GhostscriptException("DisplayDeviceAsync: gsapi_set_arg_encoding error");
}
code = GSAPI.gsapi_set_display_callback(dispInstance, ptr_display_struct);
if (code < 0)
{
throw new GhostscriptException("DisplayDeviceAsync: gsapi_set_display_callback error");
}
String fullcommand = "";
for (int k = 0; k < num_params; k++)
{
CharacterArray.Add(System.Text.Encoding.UTF8.GetBytes((gsparams.args[k] + "\0").ToCharArray()));
argParam[k] = GCHandle.Alloc(CharacterArray[k], GCHandleType.Pinned);
argPtrs[k] = argParam[k].AddrOfPinnedObject();
fullcommand = fullcommand + " " + gsparams.args[k];
}
argPtrsStable = GCHandle.Alloc(argPtrs, GCHandleType.Pinned);
fullcommand = "Command Line: " + fullcommand + "\n";
StdIOCallBack(fullcommand, fullcommand.Length);
code = GSAPI.gsapi_init_with_args(dispInstance, num_params, argPtrsStable.AddrOfPinnedObject());
if (code < 0)
{
throw new GhostscriptException("DisplayDeviceAsync: gsapi_init_with_args error");
}
}
catch (DllNotFoundException except)
{
gsErrorReport("Exception: " + except.Message);
gsparams.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = gsparams;
}
catch (BadImageFormatException except)
{
gsErrorReport("Exception: " + except.Message);
gsparams.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = gsparams;
}
catch (GhostscriptException except)
{
gsErrorReport("Exception: " + except.Message);
gsparams.result = GS_Result_t.gsFAILED;
if (dispInstance != IntPtr.Zero)
{
GSAPI.gsapi_delete_instance(dispInstance);
}
dispInstance = IntPtr.Zero;
}
catch (Exception except)
{
gsErrorReport("Exception: " + except.Message);
gsparams.result = GS_Result_t.gsFAILED;
if (dispInstance != IntPtr.Zero)
{
GSAPI.gsapi_delete_instance(dispInstance);
}
dispInstance = IntPtr.Zero;
}
finally
{
if (cleanup)
{
for (int k = 0; k < num_params; k++)
{
argParam[k].Free();
}
argPtrsStable.Free();
Result = gsparams;
if (gsparams.result == GS_Result_t.gsOK && (gsparams.task == GS_Task_t.DISPLAY_DEV_NON_PDF ||
gsparams.task == GS_Task_t.DISPLAY_DEV_THUMBS_NON_PDF))
{
gsParamState_t result = DisplayDeviceClose();
if (gsparams.result == 0)
{
gsparams.result = result.result;
}
}
}
}
gsCompleted(Result);
return;
}
/* Processing with gsapi_run_string for callback progress */
private void gsBytesAsync(object data)
{
List <object> genericlist = data as List <object>;
gsParamState_t Params = (gsParamState_t)genericlist[0];
gsParamState_t Result = Params;
int num_params = Params.args.Count;
var argParam = new GCHandle[num_params];
var argPtrs = new IntPtr[num_params];
List <byte[]> CharacterArray = new List <byte[]>(num_params);
GCHandle argPtrsStable = new GCHandle();
Byte[] Buffer = new Byte[gsConstants.GS_READ_BUFFER];
int code = 0;
int exitcode = 0;
var Feed = new GCHandle();
var FeedPtr = new IntPtr();
FileStream fs = null;
bool cleanup = true;
try
{
/* Open the file */
fs = new FileStream(Params.inputfile, FileMode.Open);
var len = (int)fs.Length;
code = GSAPI.gsapi_new_instance(out gsInstance, IntPtr.Zero);
if (code < 0)
{
throw new GhostscriptException("gsBytesAsync: gsapi_new_instance error");
}
code = GSAPI.gsapi_set_stdio(gsInstance, stdin_callback, stdout_callback, stderr_callback);
if (code < 0)
{
throw new GhostscriptException("gsBytesAsync: gsapi_set_stdio error");
}
code = GSAPI.gsapi_set_arg_encoding(gsInstance, (int)gsEncoding.GS_ARG_ENCODING_UTF8);
if (code < 0)
{
throw new GhostscriptException("gsBytesAsync: gsapi_set_arg_encoding error");
}
/* Now convert our Strings to char* and get pinned handles to these.
* This keeps the c# GC from moving stuff around on us */
String fullcommand = "";
for (int k = 0; k < num_params; k++)
{
CharacterArray.Add(System.Text.Encoding.UTF8.GetBytes((Params.args[k] + "\0").ToCharArray()));
argParam[k] = GCHandle.Alloc(CharacterArray[k], GCHandleType.Pinned);
argPtrs[k] = argParam[k].AddrOfPinnedObject();
fullcommand = fullcommand + " " + Params.args[k];
}
/* Also stick the array of pointers into memory that will not be GCd */
argPtrsStable = GCHandle.Alloc(argPtrs, GCHandleType.Pinned);
fullcommand = "Command Line: " + fullcommand + "\n";
StdIOCallBack(fullcommand, fullcommand.Length);
code = GSAPI.gsapi_init_with_args(gsInstance, num_params, argPtrsStable.AddrOfPinnedObject());
if (code < 0)
{
throw new GhostscriptException("gsBytesAsync: gsapi_init_with_args error");
}
/* Pin data buffer */
Feed = GCHandle.Alloc(Buffer, GCHandleType.Pinned);
FeedPtr = Feed.AddrOfPinnedObject();
/* Now start feeding the input piece meal and do a call back
* with our progress */
if (code == 0)
{
int count;
double perc;
int total = 0;
GSAPI.gsapi_run_string_begin(gsInstance, 0, ref exitcode);
if (exitcode < 0)
{
code = exitcode;
throw new GhostscriptException("gsBytesAsync: gsapi_run_string_begin error");
}
while ((count = fs.Read(Buffer, 0, gsConstants.GS_READ_BUFFER)) > 0)
{
GSAPI.gsapi_run_string_continue(gsInstance, FeedPtr, count, 0, ref exitcode);
if (exitcode < 0)
{
code = exitcode;
throw new GhostscriptException("gsBytesAsync: gsapi_run_string_continue error");
}
total = total + count;
perc = 100.0 * (double)total / (double)len;
gsProgressChanged(Params, (int)perc);
}
GSAPI.gsapi_run_string_end(gsInstance, 0, ref exitcode);
if (exitcode < 0)
{
code = exitcode;
throw new GhostscriptException("gsBytesAsync: gsapi_run_string_end error");
}
}
}
catch (DllNotFoundException except)
{
gsErrorReport("Exception: " + except.Message);
Params.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = Params;
}
catch (BadImageFormatException except)
{
gsErrorReport("Exception: " + except.Message);
Params.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = Params;
}
catch (GhostscriptException except)
{
gsErrorReport("Exception: " + except.Message);
}
catch (Exception except)
{
/* Could be a file io issue */
gsErrorReport("Exception: " + except.Message);
Params.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = Params;
}
finally
{
if (cleanup)
{
fs.Close();
/* Free pinned items */
for (int k = 0; k < num_params; k++)
{
argParam[k].Free();
}
argPtrsStable.Free();
Feed.Free();
/* gs clean up */
int code1 = GSAPI.gsapi_exit(gsInstance);
if ((code == 0) || (code == gsConstants.E_QUIT))
{
code = code1;
}
GSAPI.gsapi_delete_instance(gsInstance);
Params.return_code = code;
if ((code == 0) || (code == gsConstants.E_QUIT))
{
Params.result = GS_Result_t.gsOK;
Result = Params;
}
else
{
Params.result = GS_Result_t.gsFAILED;
Result = Params;
}
gsInstance = IntPtr.Zero;
}
}
gsCompleted(Result);
return;
}
/* Process command line with gsapi_init_with_args */
private void gsFileAsync(object data)
{
List <object> genericlist = data as List <object>;
gsParamState_t Params = (gsParamState_t)genericlist[0];
gsParamState_t Result = Params;
int num_params = Params.args.Count;
var argParam = new GCHandle[num_params];
var argPtrs = new IntPtr[num_params];
List <byte[]> CharacterArray = new List <byte[]>(num_params);
GCHandle argPtrsStable = new GCHandle();
int code = 0;
bool cleanup = true;
try
{
code = GSAPI.gsapi_new_instance(out gsInstance, IntPtr.Zero);
if (code < 0)
{
throw new GhostscriptException("gsFileAsync: gsapi_new_instance error");
}
code = GSAPI.gsapi_set_stdio(gsInstance, stdin_callback, stdout_callback, stderr_callback);
if (code < 0)
{
throw new GhostscriptException("gsFileAsync: gsapi_set_stdio error");
}
code = GSAPI.gsapi_set_arg_encoding(gsInstance, (int)gsEncoding.GS_ARG_ENCODING_UTF8);
if (code < 0)
{
throw new GhostscriptException("gsFileAsync: gsapi_set_arg_encoding error");
}
/* Now convert our Strings to char* and get pinned handles to these.
* This keeps the c# GC from moving stuff around on us */
String fullcommand = "";
for (int k = 0; k < num_params; k++)
{
CharacterArray.Add(System.Text.Encoding.UTF8.GetBytes((Params.args[k] + "\0").ToCharArray()));
argParam[k] = GCHandle.Alloc(CharacterArray[k], GCHandleType.Pinned);
argPtrs[k] = argParam[k].AddrOfPinnedObject();
fullcommand = fullcommand + " " + Params.args[k];
}
/* Also stick the array of pointers into memory that will not be GCd */
argPtrsStable = GCHandle.Alloc(argPtrs, GCHandleType.Pinned);
fullcommand = "Command Line: " + fullcommand + "\n";
StdIOCallBack(fullcommand, fullcommand.Length);
code = GSAPI.gsapi_init_with_args(gsInstance, num_params, argPtrsStable.AddrOfPinnedObject());
if (code < 0)
{
throw new GhostscriptException("gsFileAsync: gsapi_init_with_args error");
}
}
catch (DllNotFoundException except)
{
gsErrorReport("Exception: " + except.Message);
Params.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = Params;
}
catch (BadImageFormatException except)
{
gsErrorReport("Exception: " + except.Message);
Params.result = GS_Result_t.gsFAILED;
cleanup = false;
Result = Params;
}
catch (GhostscriptException except)
{
gsErrorReport("Exception: " + except.Message);
}
catch (Exception except)
{
gsErrorReport("Exception: " + except.Message);
}
finally
{
if (cleanup)
{
/* All the pinned items need to be freed so the GC can do its job */
for (int k = 0; k < num_params; k++)
{
argParam[k].Free();
}
argPtrsStable.Free();
int code1 = GSAPI.gsapi_exit(gsInstance);
if ((code == 0) || (code == gsConstants.E_QUIT))
{
code = code1;
}
GSAPI.gsapi_delete_instance(gsInstance);
Params.return_code = code;
if ((code == 0) || (code == gsConstants.E_QUIT))
{
Params.result = GS_Result_t.gsOK;
Result = Params;
}
else
{
Params.result = GS_Result_t.gsFAILED;
Result = Params;
}
gsInstance = IntPtr.Zero;
}
}
/* Completed. */
gsCompleted(Result);
return;
}
