Alw*_*uff 5 c++ printing winapi
我试图通过尝试自己进行打印/打印预览来绕过我的应用程序中的另一个问题.
我正在尝试创建一个如下图所示的表:

我使用C++和WinAPI,在WindowsXP的SP3.我在MS Visual Studio 2008中工作.
我没有打印机,所以我通过打印到测试结果 MS OneNote 和 XPS file.
文本从数据库获得,长度可变.由于它可能不适合原始单元格,我需要扩展单元格并适当地拟合文本,如上图所示.
副作用:
我的测试代码的结果给出了有关字体大小的不一致结果.
在OneNote中,打印结果似乎很好:

但是,在XPS中它看起来不同:

我已经检查了MSDN文档以开始使用.到目前为止,我能够在打印表面上成功绘制文本和线条.
我曾经习惯DrawTextEx执行断字(使用旗帜DT_WORDBREAK).
为了获得我使用的打印区域的大小GetDeviceCaps,并且为了获得打印机设备上下文,我使用了打印属性表.
重要说明:
如果以下问题被认为过于宽泛,请发表评论,我将编辑我的帖子.我仍然认为我的错误很小,可以在一篇文章中解释.
你能解释一下如何调整细胞以使整个细胞系适合吗?
与往常一样,以下是创建SSCCE的说明:
1)在Visual Studio中,创建默认的Win32项目.
2)在stdafx.h文件注释中, #define WIN32_LEAN_AND_MEAN因此打印属性表可以正常工作.
3)在stdafx.h下面的#include <windows.h>行中添加以下内容:
#include <windowsx.h>
#include <commctrl.h>
#pragma comment( linker, "/manifestdependency:\"type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' \
language='*'\"")
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4)在窗口过程上面添加以下功能:
// hWnd is the window that owns the property sheet.
HRESULT DisplayPrintPropertySheet(HWND hWnd)
{
HRESULT hResult;
PRINTDLGEX pdx = {0};
LPPRINTPAGERANGE pPageRanges = NULL;
// Allocate an array of PRINTPAGERANGE structures.
pPageRanges = (LPPRINTPAGERANGE) GlobalAlloc(GPTR, 10 * sizeof(PRINTPAGERANGE));
if (!pPageRanges)
return E_OUTOFMEMORY;
// Initialize the PRINTDLGEX structure.
pdx.lStructSize = sizeof(PRINTDLGEX);
pdx.hwndOwner = hWnd;
pdx.hDevMode = NULL;
pdx.hDevNames = NULL;
pdx.hDC = NULL;
pdx.Flags = PD_RETURNDC;
pdx.Flags2 = 0;
pdx.ExclusionFlags = 0;
pdx.nPageRanges = 0;
pdx.nMaxPageRanges = 10;
pdx.lpPageRanges = pPageRanges;
pdx.nMinPage = 1;
pdx.nMaxPage = 1000;
pdx.nCopies = 1;
pdx.hInstance = 0;
pdx.lpPrintTemplateName = NULL;
pdx.lpCallback = NULL;
pdx.nPropertyPages = 0;
pdx.lphPropertyPages = NULL;
pdx.nStartPage = START_PAGE_GENERAL;
pdx.dwResultAction = 0;
// Invoke the Print property sheet.
hResult = PrintDlgEx(&pdx);
if ( ( hResult == S_OK )
&& ( pdx.dwResultAction == PD_RESULT_PRINT ) )
{
// User clicked the Print button,
// so use the DC and other information returned in the
// PRINTDLGEX structure to print the document.
/***************** IMPORTANT INFO : ********************/
/****** I have added additional test code here *********/
/**** please refer to the edited part of this post *****/
/***************** at the very bottom !! ***************/
DOCINFO diDocInfo = {0};
diDocInfo.cbSize = sizeof( DOCINFO );
diDocInfo.lpszDocName = L"Testing printing...";
//******************** initialize testing font *****************//
HFONT font, oldFont;
long lfHeight = -MulDiv( 14, GetDeviceCaps( pdx.hDC, LOGPIXELSY), 72 );
font = CreateFont( lfHeight,
0, 0, 0, FW_BOLD, TRUE, FALSE, FALSE, 0, 0, 0,
0, 0, L"Microsoft Sans Serif" );
oldFont = SelectFont( pdx.hDC, font );
SetBkMode( pdx.hDC, TRANSPARENT );
SetTextColor( pdx.hDC, RGB( 255, 0, 0 ) );
//******************** end of initialization ******************//
if( StartDoc( pdx.hDC, &diDocInfo ) > 0 )
{
if( StartPage( pdx.hDC ) > 0 )
{
// get paper dimensions
int pageWidth, pageHeight;
pageWidth = GetDeviceCaps( pdx.hDC, HORZRES );
pageHeight = GetDeviceCaps( pdx.hDC, VERTRES );
/************ draw a testing grid ***************/
// draw vertical lines of the grid
for( int i = 0; i < pageWidth; i += pageWidth / 4 )
{
MoveToEx( pdx.hDC, i, 0, NULL );
LineTo( pdx.hDC, i, pageHeight );
}
// draw horizontal lines of the grid
for( int j = 0; j < pageHeight; j += pageWidth / 10 )
{
MoveToEx( pdx.hDC, 0, j, NULL );
LineTo( pdx.hDC, pageWidth, j );
}
/************************************************/
// test rectangle for drawing the text
RECT r;
r.left = 0;
r.top = 0;
r.right = 550;
r.bottom = 100;
// fill rectangle with light gray brush
// so we can see if text is properly drawn
FillRect( pdx.hDC, &r,
(HBRUSH)GetStockObject(LTGRAY_BRUSH) );
// draw text in test rectangle
if( 0 == DrawTextEx( pdx.hDC,
L"This is test string!",
wcslen( L"This is test string!" ),
&r,
DT_CENTER | DT_WORDBREAK | DT_NOCLIP, NULL ) )
// for now pop a message box saying something went wrong
MessageBox( hWnd, L"DrawText failed!", L"Error", MB_OK );
if( EndPage( pdx.hDC ) < 0 )
// for now pop a message box saying something went wrong
MessageBox( hWnd, L"EndDoc failed!", L"Error", MB_OK );
}
EndDoc( pdx.hDC );
SelectFont( pdx.hDC, oldFont );
DeleteFont( font );
}
}
if (pdx.hDevMode != NULL)
GlobalFree(pdx.hDevMode);
if (pdx.hDevNames != NULL)
GlobalFree(pdx.hDevNames);
if (pdx.lpPageRanges != NULL)
GlobalFree(pPageRanges);
if (pdx.hDC != NULL)
DeleteDC(pdx.hDC);
return hResult;
}
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5)在WM_COMMAND处理程序中,修改case IDM_ABOUT如下:
case IDM_ABOUT: // test our printing here
{
if( FAILED( DisplayPrintPropertySheet( hWnd ) ) )
MessageBox( hWnd,
L"Can't display print property sheet!",
L"Error", MB_OK );
}
//DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
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在if ( ( hResult == S_OK ) && ( pdx.dwResultAction == PD_RESULT_PRINT ) )提交的SSCCE中的块之后,我添加了以下内容用于测试目的:
int xDpi = GetDeviceCaps( pdx.hDC, LOGPIXELSX ),
yDpi = GetDeviceCaps( pdx.hDC, LOGPIXELSY );
int mapMode = GetMapMode( pdx.hDC );
wchar_t displayDPI[50];
swprintf_s( displayDPI, 50, L" xDPI = %s , yDPI = %s", xDpi, yDpi );
MessageBox( hWnd, displayDPI, L"", MB_OK );
switch( mapMode )
{
case MM_ANISOTROPIC:
MessageBox( hWnd, L"MM_ANISOTROPIC", L"", MB_OK );
break;
case MM_HIENGLISH:
MessageBox( hWnd, L"MM_HIENGLISH", L"", MB_OK );
break;
case MM_HIMETRIC:
MessageBox( hWnd, L"MM_HIMETRIC", L"", MB_OK );
break;
case MM_ISOTROPIC:
MessageBox( hWnd, L"MM_ISOTROPIC", L"", MB_OK );
break;
case MM_LOENGLISH:
MessageBox( hWnd, L"MM_LOENGLISH", L"", MB_OK );
break;
case MM_LOMETRIC:
MessageBox( hWnd, L"MM_LOMETRIC", L"", MB_OK );
break;
case MM_TEXT:
MessageBox( hWnd, L"MM_TEXT", L"", MB_OK );
break;
case MM_TWIPS:
MessageBox( hWnd, L"MM_TWIPS", L"", MB_OK );
break;
default:
MessageBeep(0);
break;
}
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在这两种情况下,映射模式是相同的(MM_TEXT),但XPS我得到xDPI = 600 , yDPI = 600的MessageBox,而OneNote中了xDPI = 300 , yDPI = 300.
这导致了成员*Carey Gregory*的评论是正确的结论 - >具有相同特征的虚拟打印机将重现相同的结果.这也解释了为什么OneNote在我测试时正确打印到XPS中,以及为什么我的应用程序失败了.要解决这个问题,我需要找到DPI感知解决方案......
使用GDI+创建字体和绘制文本我能够获得一致的结果(DPI不再是一个问题).尽管如此,如果有人知道如何使用GDI我仍然感兴趣的相同结果.
对我来说唯一的事情是绘制一个合适的网格,以便文本可以正确地适应单元格.
仔细阅读这个MSDN链接后,我能够改变字体创建代码,以实现(在我看来)稳定的结果(字体的实际高度最终变小,但我可以使用更大的数字我猜):
font = CreateFont(
// DPI aware, thanks to the below equation ( or so it seems... )
lfHeight / ( GetDeviceCaps( pdx.hDC, LOGPIXELSY ) / 96 ),
0, 0, 0, FW_BOLD, TRUE, FALSE, FALSE, 0, 0, 0, // remained the same
0, 0, L"Microsoft Sans Serif" ); // remained the same
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为了安全起见,我会尽力坚持下去,GDI+但会在测试结果的基础上更新这篇文章,GDI并且会使用上面提到的等式,以防其他人偶然发现同样的问题.我只希望能节省那些人的时间......
问题很简单。您正在调整字体大小(以像素为单位)以匹配您要绘制的设备的 DPI,但您没有调整矩形的大小。由于您的映射模式都是MM_TEXT以像素为单位测量的,并且您的边界框实际上是设备上尺寸的一半,分辨率是两倍。
解决方案是像缩放字体大小一样缩放矩形。在本例中,由于您已确定这些坐标在 300 DPI 下是正确的,因此我们将相对于该常数进行缩放。
RECT r;
r.left = 0 * GetDeviceCaps(pdx.hDC, LOGPIXELSX) / 300;
r.top = 0 * GetDeviceCaps(pdx.hDC, LOGPIXELSY) / 300;
r.right = 550 * GetDeviceCaps(pdx.hDC, LOGPIXELSX) / 300;
r.bottom = 100 * GetDeviceCaps(pdx.hDC, LOGPIXELSX) / 300;
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关于您 6 月 10 日的编辑,它之所以有效,是因为您将字体做得小得多,以便它既适合全尺寸边界框又适合半尺寸边界框。我建议返回到字体大小的原始定义,这与大多数其他 Windows 应用程序一致。