如何在VC++中使用API直接打印

(说明:)这一段代码，用以演示《如何在VC++中使用API直接打印》。并且该段代码可以直接嵌入各种工程中，有实际使用的价值。

(用途:)在Visual C++中，应用程序通常是使用CView中提供的打印功能，在OnPrint()或OnDraw()中向打印机输出。但是对于对话框中的数据，或基于对话框的程序，打印成了一件繁琐的工作。

该 段代码向用户提供了PrintListCtrl()函数，用于打印用户在对话框或FormView中的CListCtrl（控件必须是Report View 形式的）控件中的内容。在打印过程中，根据控件中每列标题的宽度计算打印输出时各列的宽度，并根据数据的行数自动分页。在本代码的基础上稍作修改，就可以 适应各种数据的输出。

(用法:)该段代码使用Visual C++ 6.0, 使用Windows API来完成所需功能，使用时将本文本作为头文件使用。打印时直接调用PrintListCtrl(),函数的参数为所要打印的ListCtrl。?联系方法：lff@mail.wl.xj.cn

*///该结构用于存储各列的信息
typedef struct tagColAtt
{
int nColIndex;
CString strColText;
int nPrintX;
int nSubItemIndex;
}
COLATT;

BOOL PrintListCtrl(CListCtrl &list)
{
PRINTDLG pd;
pd.lStructSize = sizeof(PRINTDLG);
pd.Flags = PD_RETURNDC;
pd.hDC = NULL;
pd.hwndOwner = NULL;
pd.hInstance = NULL;
pd.nMaxPage = 1;
pd.nMinPage = 1;
pd.nFromPage = 1;
pd.nToPage = 1;
pd.nCopies = 1;
pd.hDevMode = NULL;
pd.hDevNames = NULL;
//显示打印对话框，
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由用户来设定纸张大小等。
if(!PrintDlg(&pd)) return FALSE;
ASSERT(pd.hDC!=NULL);
int nHorRes = GetDeviceCaps(pd.hDC, HORZRES);
int nVerRes = GetDeviceCaps(pd.hDC, VERTRES);
int nXMargin = 2;
int nYMargin = 2;
TEXTMETRIC tm;
GetTextMetrics(pd.hDC, &tm);
int nCharHeight = tm.tmHeight;
int nCharWidth = tm.tmAveCharWidth;
CHeaderCtrl* pHeader = list.GetHeaderCtrl();
//获得行，列的个数
int nColCount = pHeader->GetItemCount();
int nLineCount = list.GetItemCount();
int ColOrderArray[100];
COLATT ca[100];
list.GetColumnOrderArray(ColOrderArray, nColCount);
int nColX =nXMargin*nCharWidth;
//检索各列的信息，确定列标题的内容长度。
for(int i =0 ; i< nColCount; i++)
{
ca[i].nColIndex = ColOrderArray[i];
LVCOLUMN lvc;
char text[100];
lvc.mask = LVCF_TEXT|LVCF_SUBITEM;
lvc.pszText = text;
lvc.cchTextMax = 100;
list.GetColumn(ca[i].nColIndex, &lvc);
ca[i].strColText = lvc.pszText;
ca[i].nSubItemIndex = lvc.iSubItem;
ca[i].nPrintX = nColX;
nColX += nCharWidth * strlen(ca[i].strColText);
if(nColX > nHorRes)
{
DeleteDC(pd.hDC);
AfxMessageBox("字段太多，无法在一行内打印，请试用较大的纸，或横向打印。");
return FALSE;
}
}
DOCINFO di;
di.cbSize = sizeof(DOCINFO);
di.lpszDocName = "ListCtrl Data Printing";
di.lpszOutput = (LPTSTR) NULL;
di.lpszDatatype = (LPTSTR) NULL;
di.fwType = 0;
StartDoc(pd.hDC, &di);
StartPage(pd.hDC);
//调整各列的宽度，以使各列在后面的打印输出时更均匀的打印在纸上。
int space = (nHorRes-nXMargin*nCharWidth-nColX) / (nColCount -1);
for(i =1; i<nColCount; i++)
{
ca[i].nPrintX += i*space;
}
//输出列标题
for(i =0; i<nColCount; i++)
TextOut(pd.hDC, ca[i].nPrintX, nYMargin,
ca[i].strColText, strlen(ca[i].strColText));
int nMaxLinePerPage = nVerRes/nCharHeight -3;
int nCurPage =1;
//输出各列的数据
for(i =0; i<nLineCount; i++)
{
for(int j =0; j<nColCount; j++)
{
if(i+1-(nCurPage-1)*nMaxLinePerPage > nMaxLinePerPage)
{
//新的一页
EndPage(pd.hDC);
StartPage(pd.hDC);
nCurPage ++;
}
CString subitem = list.GetItemText(i, ca[j].nSubItemIndex);
TextOut(pd.hDC, ca[j].nPrintX,nYMargin+(i+1-(nCurPage-1)*nMaxLinePerPage)*nCharHeight,subitem, strlen(subitem));
}
}
EndPage(pd.hDC);
EndDoc(pd.hDC);
//打印结束
DeleteDC(pd.hDC);
return TRUE;    TRACKBACK:http://www.kpwang.com/vc/110651711139.htm