ReportMachine 打印机横向

Portrait 纵向

landscape  横向

RM_reg.pas ；TRMPageSetupForm

打印机设置RM_PageSetup.dfm

 TRMPageSetting定义在RM_Printer.pas

TRMPrinterOrientation = (rmpoPortrait, rmpoLandscape);

TRMPageSetting

property PageOr: TRMPrinterOrientation read FPageOr write SetPageOr;

TRMPageSetupForm = class(TForm)

property PageSetting: TRMPageSetting read FPageSetting;

TRMPageLayout = class(TPersistent)

property PageOrientation: TRMPrinterOrientation read FPageOr write FPageOr;

调用打印机设置窗口

RM_reg.pas

procedure TRMPageLayoutProperty.Edit;

打印方法：

RM_Class.pas

procedure TRMReport.PrintReport;

_DoPrintReport函数中

lPrinter := ReportPrinter;

初始值就不对。

ReportPrinter.PaperWidth;
ReportPrinter.PaperHeight;

ReportPrinter.PrintableWidth;
ReportPrinter.PrintableHeight;

RMReport1.LoadFromFile('Untitled5.rmf');装载完文件后，RM_Printer.pas里的FRMPrinter变量就变成真实的宽度了从4961变成7016了。也就是说PrintReport无问题了。

RM_Class.pas

TRMReport.LoadFromStream

PrinterName := RMReadString(aStream); 读出原始值。

Pages.LoadFromStream(FReportVersion, aStream);变成7016了

  >lPage.LoadFromStream(aStream);

>TRMReportPage.LoadFromStream

>ChangePaper(FPageSize, PageWidth, PageHeight, FPageBin, FPageOrientation);

RM_Printer.pas

procedure TRMCustomPrinter.DeviceContextChanged;

  >FPaperWidth := GetDeviceCaps(FDC, PHYSICALWIDTH); //纸宽 ，单位为打印机象素

再跟踪

function TRMCustomPrinter.GetDC: HDC;  FDC有为0 的情况，所以获取值。但是xe8没有为0的情况

 TRMPrinter.SetPrinterInfo函数里，aPageWidth，aPageHeight根据横竖算过了，在SetSettings又算一遍，不是又退回来了嘛！

procedure TRMPrinter.SetSettings(aPgWidth, aPgHeight: Integer);

TRMPrinter.SetSettings

lPDevMode := GlobalLock(lDevMode); 这个lPDevMode 为nil，d7中是正常有值，xe8里为nil，导致后续代码未执行。

FDevMode := GlobalAlloc(GHND,DocumentProperties(0, PrinterHandle, PChar(lPrinterInfo.Device), lStubDevMode, lStubDevMode, 0)); //一直为0

D7下

DocumentProperties(0, PrinterHandle, PChar(lPrinterInfo.Device), lStubDevMode, lStubDevMode, 0);=1012；，C6下也是1012；

xe8 delphi下，用Longint类型接受返回值是-1，用dword接受返回的是4294967295，这两个值都是错的，用xe8 c++获得是1076，比c6和d7多是因为用了Unicode的原因？

DocumentProperties()返回最后一个参数设置为 0 时所需的 DEVMODE 缓冲区的字节的数

function DocumentProperties(hWnd: HWND; hPrinter: THandle; pDeviceName: LPWSTR;const pDevModeOutput: TDeviceMode; var pDevModeInput: TDeviceMode;fMode: DWORD): Longint; stdcall; overload;

c6定义

 LONG (APIENTRY* pfnDocumentProperties)(HWND hWnd, HANDLE hPrinter, LPTSTR pDeviceName, PDEVMODE pDevModeOutput, PDEVMODE pDevModeInput,DWORD fMode);

第一步获取nSize不正确，A zero for last param returns the size of buffer needed.最后一个参数为0，后3个都是NULL，不用设定DevMode^参数，就正确了。

焦点就是如何缓冲区的大缓冲区字节的数

https://support.microsoft.com/en-us/kb/167345/zh-cn

https://support.microsoft.com/en-us/kb/140285

http://blog.csdn.net/hjfjoy/article/details/4250164

//果然是unicode的差异，导致获得的字节数不一样，以下代码在c6，xec8下都可以执行。结果验证。
void __fastcall TForm35::Button1Click(TObject *Sender)
{
    HANDLE hPrinter;
    DWORD pDevModeBytes;
    OpenPrinter(L"Microsoft XPS Document Writer", &hPrinter, NULL);
    pDevModeBytes = DocumentPropertiesW(0, hPrinter, L"Microsoft XPS Document Writer", NULL, NULL, 0);  //1076
    pDevModeBytes = DocumentPropertiesA(0, hPrinter, "Microsoft XPS Document Writer", NULL, NULL, 0); //1012
}

LONG
WINAPI
AdvancedDocumentPropertiesA(
IN HWND hWnd,
IN HANDLE hPrinter,
IN LPSTR pDeviceName,
OUT PDEVMODEA pDevModeOutput,
IN PDEVMODEA pDevModeInput
);
LONG
WINAPI
AdvancedDocumentPropertiesW(
IN HWND hWnd,
IN HANDLE hPrinter,
IN LPWSTR pDeviceName,
OUT PDEVMODEW pDevModeOutput,
IN PDEVMODEW pDevModeInput
);

RM_Printer.pas  1334 Line

 DocumentProperties(0, PrinterHandle, PChar(lPrinterInfo.Device), lStubDevMode, lStubDevMode, 0); 

>改成下面的就好了。

 DocumentProperties(0, PrinterHandle, PChar(lPrinterInfo.Device), nil, nil, 0);

这个计算空间，每一种打印机大小都不一样，打印机牌子、型号不一样，空间大小不相同，只能实际计算了。

最后修改正确，监视lPrinter的值如下，和d7相同了。

Draw(MasterReport, lPrinter.Canvas, liRect);