Call PCL to PDF Converter by CreateProcess() function

I like your program very much, but I don't see an option to run it in the background without being on the taskbar (that's the big space in the bottom of the screen). Is there any way to do that?

Thanks,
========================
Thanks for your message, can you please let us know what product are you using?

VeryPDF
========================
VeryPDF PCL Converter v2.0
Thanks,
========================
You can use CreateProcess() function to run PCL to PDF Converter EXE application, and use CreatePipe() to hide the DOS window, please refer to following web page for more information,

http://support.microsoft.com/kb/190351

Sample code
/*++

Copyright (c) 1998  Microsoft Corporation

Module Name:

Redirect.c

Description:
This sample illustrates how to spawn a child console based
application with redirected standard handles.

The following import libraries are required:
user32.lib

Dave McPherson (davemm)   11-March-98

--*/

#include<windows.h>
#pragma comment(lib, "User32.lib")
void DisplayError(char *pszAPI);
void ReadAndHandleOutput(HANDLE hPipeRead);
void PrepAndLaunchRedirectedChild(HANDLE hChildStdOut,
HANDLE hChildStdIn,
HANDLE hChildStdErr);
DWORD WINAPI GetAndSendInputThread(LPVOID lpvThreadParam);

HANDLE hChildProcess = NULL;
HANDLE hStdIn = NULL; // Handle to parents std input.
BOOL bRunThread = TRUE;

void main ()
{
HANDLE hOutputReadTmp,hOutputRead,hOutputWrite;
HANDLE hInputWriteTmp,hInputRead,hInputWrite;
HANDLE hErrorWrite;
HANDLE hThread;
DWORD ThreadId;
SECURITY_ATTRIBUTES sa;

// Set up the security attributes struct.
sa.nLength= sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;

// Create the child output pipe.
if (!CreatePipe(&hOutputReadTmp,&hOutputWrite,&sa,0))
DisplayError("CreatePipe");

// Create a duplicate of the output write handle for the std error
// write handle. This is necessary in case the child application
// closes one of its std output handles.
if (!DuplicateHandle(GetCurrentProcess(),hOutputWrite,
GetCurrentProcess(),&hErrorWrite,0,
TRUE,DUPLICATE_SAME_ACCESS))
DisplayError("DuplicateHandle");

// Create the child input pipe.
if (!CreatePipe(&hInputRead,&hInputWriteTmp,&sa,0))
DisplayError("CreatePipe");

// Create new output read handle and the input write handles. Set
// the Properties to FALSE. Otherwise, the child inherits the
// properties and, as a result, non-closeable handles to the pipes
// are created.
if (!DuplicateHandle(GetCurrentProcess(),hOutputReadTmp,
GetCurrentProcess(),
&hOutputRead, // Address of new handle.
0,FALSE, // Make it uninheritable.
DUPLICATE_SAME_ACCESS))
DisplayError("DupliateHandle");

if (!DuplicateHandle(GetCurrentProcess(),hInputWriteTmp,
GetCurrentProcess(),
&hInputWrite, // Address of new handle.
0,FALSE, // Make it uninheritable.
DUPLICATE_SAME_ACCESS))
DisplayError("DupliateHandle");

// Close inheritable copies of the handles you do not want to be
// inherited.
if (!CloseHandle(hOutputReadTmp)) DisplayError("CloseHandle");
if (!CloseHandle(hInputWriteTmp)) DisplayError("CloseHandle");

// Get std input handle so you can close it and force the ReadFile to
// fail when you want the input thread to exit.
if ( (hStdIn = GetStdHandle(STD_INPUT_HANDLE)) ==
INVALID_HANDLE_VALUE )
DisplayError("GetStdHandle");

PrepAndLaunchRedirectedChild(hOutputWrite,hInputRead,hErrorWrite);

// Close pipe handles (do not continue to modify the parent).
// You need to make sure that no handles to the write end of the
// output pipe are maintained in this process or else the pipe will
// not close when the child process exits and the ReadFile will hang.
if (!CloseHandle(hOutputWrite)) DisplayError("CloseHandle");
if (!CloseHandle(hInputRead )) DisplayError("CloseHandle");
if (!CloseHandle(hErrorWrite)) DisplayError("CloseHandle");

// Launch the thread that gets the input and sends it to the child.
hThread = CreateThread(NULL,0,GetAndSendInputThread,
(LPVOID)hInputWrite,0,&ThreadId);
if (hThread == NULL) DisplayError("CreateThread");

// Read the child's output.
ReadAndHandleOutput(hOutputRead);
// Redirection is complete

// Force the read on the input to return by closing the stdin handle.
if (!CloseHandle(hStdIn)) DisplayError("CloseHandle");

// Tell the thread to exit and wait for thread to die.
bRunThread = FALSE;

if (WaitForSingleObject(hThread,INFINITE) == WAIT_FAILED)
DisplayError("WaitForSingleObject");

if (!CloseHandle(hOutputRead)) DisplayError("CloseHandle");
if (!CloseHandle(hInputWrite)) DisplayError("CloseHandle");
}

///////////////////////////////////////////////////////////////////////
// PrepAndLaunchRedirectedChild
// Sets up STARTUPINFO structure, and launches redirected child.
///////////////////////////////////////////////////////////////////////
void PrepAndLaunchRedirectedChild(HANDLE hChildStdOut,
HANDLE hChildStdIn,
HANDLE hChildStdErr)
{
PROCESS_INFORMATION pi;
STARTUPINFO si;

// Set up the start up info struct.
ZeroMemory(&si,sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdOutput = hChildStdOut;
si.hStdInput  = hChildStdIn;
si.hStdError  = hChildStdErr;
// Use this if you want to hide the child:
//     si.wShowWindow = SW_HIDE;
// Note that dwFlags must include STARTF_USESHOWWINDOW if you want to
// use the wShowWindow flags.

// Launch the process that you want to redirect (in this case,
// Child.exe). Make sure Child.exe is in the same directory as
// redirect.c launch redirect from a command line to prevent location
// confusion.
if (!CreateProcess(NULL,"Child.EXE",NULL,NULL,TRUE,
CREATE_NEW_CONSOLE,NULL,NULL,&si,&pi))
DisplayError("CreateProcess");

// Set global child process handle to cause threads to exit.
hChildProcess = pi.hProcess;

// Close any unnecessary handles.
if (!CloseHandle(pi.hThread)) DisplayError("CloseHandle");
}

///////////////////////////////////////////////////////////////////////
// ReadAndHandleOutput
// Monitors handle for input. Exits when child exits or pipe breaks.
///////////////////////////////////////////////////////////////////////
void ReadAndHandleOutput(HANDLE hPipeRead)
{
CHAR lpBuffer[256];
DWORD nBytesRead;
DWORD nCharsWritten;

while(TRUE)
{
if (!ReadFile(hPipeRead,lpBuffer,sizeof(lpBuffer),
&nBytesRead,NULL) || !nBytesRead)
{
if (GetLastError() == ERROR_BROKEN_PIPE)
break; // pipe done - normal exit path.
else
DisplayError("ReadFile"); // Something bad happened.
}

// Display the character read on the screen.
if (!WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE),lpBuffer,
nBytesRead,&nCharsWritten,NULL))
DisplayError("WriteConsole");
}
}

///////////////////////////////////////////////////////////////////////
// GetAndSendInputThread
// Thread procedure that monitors the console for input and sends input
// to the child process through the input pipe.
// This thread ends when the child application exits.
///////////////////////////////////////////////////////////////////////
DWORD WINAPI GetAndSendInputThread(LPVOID lpvThreadParam)
{
CHAR read_buff[256];
DWORD nBytesRead,nBytesWrote;
HANDLE hPipeWrite = (HANDLE)lpvThreadParam;

// Get input from our console and send it to child through the pipe.
while (bRunThread)
{
if(!ReadConsole(hStdIn,read_buff,1,&nBytesRead,NULL))
DisplayError("ReadConsole");

read_buff[nBytesRead] = '\0'; // Follow input with a NULL.

if (!WriteFile(hPipeWrite,read_buff,nBytesRead,&nBytesWrote,NULL))
{
if (GetLastError() == ERROR_NO_DATA)
break; // Pipe was closed (normal exit path).
else
DisplayError("WriteFile");
}
}

return 1;
}

///////////////////////////////////////////////////////////////////////
// DisplayError
// Displays the error number and corresponding message.
///////////////////////////////////////////////////////////////////////
void DisplayError(char *pszAPI)
{
LPVOID lpvMessageBuffer;
CHAR szPrintBuffer[512];
DWORD nCharsWritten;

FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpvMessageBuffer, 0, NULL);

wsprintf(szPrintBuffer,
"ERROR: API    = %s.\n   error code = %d.\n   message    = %s.\n",
pszAPI, GetLastError(), (char *)lpvMessageBuffer);

WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE),szPrintBuffer,
lstrlen(szPrintBuffer),&nCharsWritten,NULL);

LocalFree(lpvMessageBuffer);
ExitProcess(GetLastError());
}

//////////////////////////////////////////////////////////////////////
// child.c
// Echoes all input to stdout. This will be redirected by the redirect
// sample. Compile and build child.c as a Win32 Console application and
// put it in the same directory as the redirect sample.
//
#include<windows.h>
#include<stdio.h>
#include<string.h>

void main ()
{
FILE*    fp;
CHAR     szInput[1024];

// Open the console. By doing this, you can send output directly to
// the console that will not be redirected.

fp = fopen("CON", "w");
if (!fp) {
printf("Error opening child console - perhaps there is none.\n");
fflush(NULL);
}
else
{

// Write a message direct to the console (will not be redirected).

fprintf(fp,"This data is being printed directly to the\n");
fprintf(fp,"console and will not be redirected.\n\n");
fprintf(fp,"Since the standard input and output have been\n");
fprintf(fp,"redirected data sent to and from those handles\n");
fprintf(fp,"will be redirected.\n\n");
fprintf(fp,"To send data to the std input of this process.\n");
fprintf(fp,"Click on the console window of the parent process\n");
fprintf(fp,"(redirect), and enter data from it's console\n\n");
fprintf(fp,"To exit this process send the string 'exit' to\n");
fprintf(fp,"it's standard input\n");
fflush(fp);
}

ZeroMemory(szInput,1024);
while (TRUE)
{
gets(szInput);
printf("Child echoing [%s]\n",szInput);
fflush(NULL);  // Must flush output buffers or else redirection
// will be problematic.
if (!_stricmp(szInput,"Exit") )
break;

ZeroMemory(szInput,strlen(szInput) );

}
}

VeryPDF
========================

You can use CreateProcess() function to run PCL to PDF Converter EXE application, and use CreatePipe to hide the DOS window, please refer to following web page for more information,

 

http://support.microsoft.com/kb/190351

 

Sample code

/*++

Copyright (c) 1998  Microsoft Corporation

Module Name:

Redirect.c

Description:

This sample illustrates how to spawn a child console based

application with redirected standard handles.

The following import libraries are required:

user32.lib

Dave McPherson (davemm)   11-March-98

--*/

#include<windows.h>

#pragma comment(lib, "User32.lib")

void DisplayError(char *pszAPI);

void ReadAndHandleOutput(HANDLE hPipeRead);

void PrepAndLaunchRedirectedChild(HANDLE hChildStdOut,

HANDLE hChildStdIn,

HANDLE hChildStdErr);

DWORD WINAPI GetAndSendInputThread(LPVOID lpvThreadParam);

HANDLE hChildProcess = NULL;

HANDLE hStdIn = NULL; // Handle to parents std input.

BOOL bRunThread = TRUE;

void main ()

{

HANDLE hOutputReadTmp,hOutputRead,hOutputWrite;

HANDLE hInputWriteTmp,hInputRead,hInputWrite;

HANDLE hErrorWrite;

HANDLE hThread;

DWORD ThreadId;

SECURITY_ATTRIBUTES sa;

// Set up the security attributes struct.

sa.nLength= sizeof(SECURITY_ATTRIBUTES);

sa.lpSecurityDescriptor = NULL;

sa.bInheritHandle = TRUE;

// Create the child output pipe.

if (!CreatePipe(&hOutputReadTmp,&hOutputWrite,&sa,0))

DisplayError("CreatePipe");

// Create a duplicate of the output write handle for the std error

// write handle. This is necessary in case the child application

// closes one of its std output handles.

if (!DuplicateHandle(GetCurrentProcess(),hOutputWrite,

GetCurrentProcess(),&hErrorWrite,0,

TRUE,DUPLICATE_SAME_ACCESS))

DisplayError("DuplicateHandle");

// Create the child input pipe.

if (!CreatePipe(&hInputRead,&hInputWriteTmp,&sa,0))

DisplayError("CreatePipe");

// Create new output read handle and the input write handles. Set

// the Properties to FALSE. Otherwise, the child inherits the

// properties and, as a result, non-closeable handles to the pipes

// are created.

if (!DuplicateHandle(GetCurrentProcess(),hOutputReadTmp,

GetCurrentProcess(),

&hOutputRead, // Address of new handle.

0,FALSE, // Make it uninheritable.

DUPLICATE_SAME_ACCESS))

DisplayError("DupliateHandle");

if (!DuplicateHandle(GetCurrentProcess(),hInputWriteTmp,

GetCurrentProcess(),

&hInputWrite, // Address of new handle.

0,FALSE, // Make it uninheritable.

DUPLICATE_SAME_ACCESS))

DisplayError("DupliateHandle");

// Close inheritable copies of the handles you do not want to be

// inherited.

if (!CloseHandle(hOutputReadTmp)) DisplayError("CloseHandle");

if (!CloseHandle(hInputWriteTmp)) DisplayError("CloseHandle");

// Get std input handle so you can close it and force the ReadFile to

// fail when you want the input thread to exit.

if ( (hStdIn = GetStdHandle(STD_INPUT_HANDLE)) ==

INVALID_HANDLE_VALUE )

DisplayError("GetStdHandle");

PrepAndLaunchRedirectedChild(hOutputWrite,hInputRead,hErrorWrite);

// Close pipe handles (do not continue to modify the parent).

// You need to make sure that no handles to the write end of the

// output pipe are maintained in this process or else the pipe will

// not close when the child process exits and the ReadFile will hang.

if (!CloseHandle(hOutputWrite)) DisplayError("CloseHandle");

if (!CloseHandle(hInputRead )) DisplayError("CloseHandle");

if (!CloseHandle(hErrorWrite)) DisplayError("CloseHandle");

// Launch the thread that gets the input and sends it to the child.

hThread = CreateThread(NULL,0,GetAndSendInputThread,

(LPVOID)hInputWrite,0,&ThreadId);

if (hThread == NULL) DisplayError("CreateThread");

// Read the child's output.

ReadAndHandleOutput(hOutputRead);

// Redirection is complete

// Force the read on the input to return by closing the stdin handle.

if (!CloseHandle(hStdIn)) DisplayError("CloseHandle");

// Tell the thread to exit and wait for thread to die.

bRunThread = FALSE;

if (WaitForSingleObject(hThread,INFINITE) == WAIT_FAILED)

DisplayError("WaitForSingleObject");

if (!CloseHandle(hOutputRead)) DisplayError("CloseHandle");

if (!CloseHandle(hInputWrite)) DisplayError("CloseHandle");

}

///////////////////////////////////////////////////////////////////////

// PrepAndLaunchRedirectedChild

// Sets up STARTUPINFO structure, and launches redirected child.

///////////////////////////////////////////////////////////////////////

void PrepAndLaunchRedirectedChild(HANDLE hChildStdOut,

HANDLE hChildStdIn,

HANDLE hChildStdErr)

{

PROCESS_INFORMATION pi;

STARTUPINFO si;

// Set up the start up info struct.

ZeroMemory(&si,sizeof(STARTUPINFO));

si.cb = sizeof(STARTUPINFO);

si.dwFlags = STARTF_USESTDHANDLES;

si.hStdOutput = hChildStdOut;

si.hStdInput  = hChildStdIn;

si.hStdError  = hChildStdErr;

// Use this if you want to hide the child:

//     si.wShowWindow = SW_HIDE;

// Note that dwFlags must include STARTF_USESHOWWINDOW if you want to

// use the wShowWindow flags.

// Launch the process that you want to redirect (in this case,

// Child.exe). Make sure Child.exe is in the same directory as

// redirect.c launch redirect from a command line to prevent location

// confusion.

if (!CreateProcess(NULL,"Child.EXE",NULL,NULL,TRUE,

CREATE_NEW_CONSOLE,NULL,NULL,&si,&pi))

DisplayError("CreateProcess");

// Set global child process handle to cause threads to exit.

hChildProcess = pi.hProcess;

// Close any unnecessary handles.

if (!CloseHandle(pi.hThread)) DisplayError("CloseHandle");

}

///////////////////////////////////////////////////////////////////////

// ReadAndHandleOutput

// Monitors handle for input. Exits when child exits or pipe breaks.

///////////////////////////////////////////////////////////////////////

void ReadAndHandleOutput(HANDLE hPipeRead)

{

CHAR lpBuffer[256];

DWORD nBytesRead;

DWORD nCharsWritten;

while(TRUE)

{

if (!ReadFile(hPipeRead,lpBuffer,sizeof(lpBuffer),

&nBytesRead,NULL) || !nBytesRead)

{

if (GetLastError() == ERROR_BROKEN_PIPE)

break; // pipe done - normal exit path.

else

DisplayError("ReadFile"); // Something bad happened.

}

// Display the character read on the screen.

if (!WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE),lpBuffer,

nBytesRead,&nCharsWritten,NULL))

DisplayError("WriteConsole");

}

}

///////////////////////////////////////////////////////////////////////

// GetAndSendInputThread

// Thread procedure that monitors the console for input and sends input

// to the child process through the input pipe.

// This thread ends when the child application exits.

///////////////////////////////////////////////////////////////////////

DWORD WINAPI GetAndSendInputThread(LPVOID lpvThreadParam)

{

CHAR read_buff[256];

DWORD nBytesRead,nBytesWrote;

HANDLE hPipeWrite = (HANDLE)lpvThreadParam;

// Get input from our console and send it to child through the pipe.

while (bRunThread)

{

if(!ReadConsole(hStdIn,read_buff,1,&nBytesRead,NULL))

DisplayError("ReadConsole");

read_buff[nBytesRead] = '\0'; // Follow input with a NULL.

if (!WriteFile(hPipeWrite,read_buff,nBytesRead,&nBytesWrote,NULL))

{

if (GetLastError() == ERROR_NO_DATA)

break; // Pipe was closed (normal exit path).

else

DisplayError("WriteFile");

}

}

return 1;

}

///////////////////////////////////////////////////////////////////////

// DisplayError

// Displays the error number and corresponding message.

///////////////////////////////////////////////////////////////////////

void DisplayError(char *pszAPI)

{

LPVOID lpvMessageBuffer;

CHAR szPrintBuffer[512];

DWORD nCharsWritten;

FormatMessage(

FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,

NULL, GetLastError(),

MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

(LPTSTR)&lpvMessageBuffer, 0, NULL);

wsprintf(szPrintBuffer,

"ERROR: API    = %s.\n   error code = %d.\n   message    = %s.\n",

pszAPI, GetLastError(), (char *)lpvMessageBuffer);

WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE),szPrintBuffer,

lstrlen(szPrintBuffer),&nCharsWritten,NULL);

LocalFree(lpvMessageBuffer);

ExitProcess(GetLastError());

}

//////////////////////////////////////////////////////////////////////

// child.c

// Echoes all input to stdout. This will be redirected by the redirect

// sample. Compile and build child.c as a Win32 Console application and

// put it in the same directory as the redirect sample.

//

#include<windows.h>

#include<stdio.h>

#include<string.h>

void main ()

{

FILE*    fp;

CHAR     szInput[1024];

// Open the console. By doing this, you can send output directly to

// the console that will not be redirected.

fp = fopen("CON", "w");

if (!fp) {

printf("Error opening child console - perhaps there is none.\n");

fflush(NULL);

}

else

{

// Write a message direct to the console (will not be redirected).

fprintf(fp,"This data is being printed directly to the\n");

fprintf(fp,"console and will not be redirected.\n\n");

fprintf(fp,"Since the standard input and output have been\n");

fprintf(fp,"redirected data sent to and from those handles\n");

fprintf(fp,"will be redirected.\n\n");

fprintf(fp,"To send data to the std input of this process.\n");

fprintf(fp,"Click on the console window of the parent process\n");

fprintf(fp,"(redirect), and enter data from it's console\n\n");

fprintf(fp,"To exit this process send the string 'exit' to\n");

fprintf(fp,"it's standard input\n");

fflush(fp);

}

ZeroMemory(szInput,1024);

while (TRUE)

{

gets(szInput);

printf("Child echoing [%s]\n",szInput);

fflush(NULL);  // Must flush output buffers or else redirection

// will be problematic.

if (!_stricmp(szInput,"Exit") )

break;

ZeroMemory(szInput,strlen(szInput) );

}

}

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