c++快速开发例子--打印

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这段代码展示了如何使用Borland C++ Builder进行打印操作，包括设置打印次数、副本数量、页码范围，并在打印过程中处理页面布局和标题。程序首先保存当前页面，然后根据用户的打印设置进行多次打印，每次打印可能包含多个副本。对于每个页码，程序会打印页面内容并在必要时插入新的页面。

#include <vcl.h>
#pragma hdrstop
#include <printers.hpp>

#include "mainform.h"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"
TFormMain *FormMain;
//---------------------------------------------------------------------------
__fastcall TFormMain::TFormMain(TComponent* Owner)
: TForm(Owner)
{

}
//---------------------------------------------------------------------------
void __fastcall TFormMain::PrintBtnClick(TObject *Sender)
{

int trips; // number of times to print from first to last
int dups; // number of copies of each page to print each time
int firstpg;
int lastpg;
bool needsnewpg=false;

// make sure the current page is saved before printing
pages[TabSet1->TabIndex]->Text = Memo1->Text;

if (!PrintDialog1->Execute())
return; // user did not press OK

// if we're not collating, we only go from the first page to last page once
// but each time through we print duplicates of each page.
if (!PrintDialog1->Collate)
{
trips = 1;
dups = PrintDialog1->Copies;
}
// if we're collating, we go from the first page to the last page
// multiple times but only print one duplicate each time through.
else
{
trips = PrintDialog1->Copies;
dups = 1;
}

// user has selected to print all pages...
if (PrintDialog1->PrintRange == prAllPages)
{
firstpg = 1;
lastpg = 5;
}
// ...or a range of pages
else
{
firstpg = PrintDialog1->FromPage;
lastpg = PrintDialog1->ToPage;
}

// Initialize print job
Printer()->BeginDoc();

// Title to appear in the print manager and network print banners
Printer()->Title = "Borland C++Builder Printer Example";

for (int x=0; x<trips; x++) // for each pass
for (int y=firstpg-1; y<lastpg; y++) // for each page
for (int z=0; z<dups; z++) // for each dup of the page
{
if (needsnewpg) // page 1 does not need a page break
Printer()->NewPage();
PrintPage(y); // print the page
needsnewpg = true; // subsequent pages need page breaks
}

Printer()->EndDoc();
}
//---------------------------------------------------------------------
void __fastcall TFormMain::FormShow(TObject *Sender)
{
// initialize variables
currentpage=0;
for (int i=0; i<5; i++)
{
pages[i] = new TStringList;
pages[i]->Text = "Page " + IntToStr(i+1);
}

// the first page is the initial page
Memo1->Text = pages[0]->Text;
}
//---------------------------------------------------------------------
void __fastcall TFormMain::TabSet1Click(TObject *Sender)
{
// When a tab is selected, put the text for that page into the memo control
Memo1->Text = pages[TabSet1->TabIndex]->Text;
}
//---------------------------------------------------------------------
void __fastcall TFormMain::PrintPage(int page)
{
int pageline=0; // keeps track of the line number as we print for correct
// positioning of text on the page

// print a banner
Printer()->Canvas->TextOut(20,
(10+Printer()->Canvas->TextHeight("Hi there!"))*pageline,
"Borland C++Builder Printer Example -- Page " + IntToStr(page+1));
pageline+=2;

for (int line=0; line < pages[page]->Count; line++)
{
Printer()->Canvas->TextOut(20,
(10+Printer()->Canvas->TextHeight("Hi there!"))*pageline,
pages[page]->Strings[line].c_str());
pageline++;
}
}
//---------------------------------------------------------------------
void __fastcall TFormMain::TabSet1Change(TObject *Sender, int NewTab,
bool &AllowChange)
{
// before we leave this tab, save the text for this page
pages[TabSet1->TabIndex]->Text = Memo1->Text;
}
//---------------------------------------------------------------------
__fastcall TFormMain::~TFormMain(void)
{
// release dynamic data
for (int i=0; i<5; i++)
{
delete pages[i];
}
}
//-------------------------------------------------------------