VFP打印表单问题

回复 7楼 fnxyy

程序代码：

VFP中将表单的内容直接打印 在某表单的一个command 按纽中执行 do PrintForm.prg *-- 定义常量#DEFINE LOGPIXELSX 88#DEFINE LOGPIXELSY 90#DEFINE PHYSICALOFFSETX 112#DEFINE PHYSICALOFFSETY 113#DEFINE SRCCOPY 13369376#DEFINE DIB_RGB_COLORS 0*-- 调用本程序段中的子过程DO decl*-- 定义变量PRIVATE pnWidth, pnHeight, lnBitsPerPixel, lnBytesPerScan STORE 0 TO pnWidth, pnHeight, lnBitsPerPixel, lnBytesPerScan LOCAL hwnd, hFormDC, hPrnDC, hMemDC, hMemBmp, hSavedBitmap,; xOffsPrn, yOffsPrn, xScale, yScale, lcDocInfo, lcBInfo, lpBitsArray*-- 得到打印机设备的坐标偏移量hPrnDC = getDefaultPrnDC() && 没有进行错误检查 xOffsPrn = GetDeviceCaps(hPrnDC, PHYSICALOFFSETX) yOffsPrn = GetDeviceCaps(hPrnDC, PHYSICALOFFSETY)*-- 得到屏幕的窗口句柄，及她们的宽度、高度等。hwnd = GetFocus() && a window with keyboard focus hFormDC = GetWindowDC(hwnd)= getWinRect (hwnd, @pnWidth, @pnHeight)*-- 根据屏幕和打印机得到缩放值xScale = GetDeviceCaps(hPrnDC, LOGPIXELSX)/GetDeviceCaps(hFormDC,LOGPIXELSX) yScale = GetDeviceCaps(hPrnDC, LOGPIXELSY)/GetDeviceCaps(hFormDC,LOGPIXELSY)*-- 将屏幕的内容创建为位图图象数据hMemDC = CreateCompatibleDC (hFormDC) hMemBmp = CreateCompatibleBitmap (hFormDC, pnWidth, pnHeight) hSavedBitmap = SelectObject(hMemDC, hMemBmp)*-- 将位图数据从屏幕拷贝到虚拟设备上= BitBlt (hMemDC, 0,0, pnWidth,pnHeight, hFormDC, 0,0, SRCCOPY)= SelectObject(hMemDC, hSavedBitmap)* retrieving bits from the compatible bitmap into a buffer* as a device-independent bitmap (DIB) with a BitsPerPixel value* as one of the printer device context lcBInfo = InitBitmapInfo(hPrnDC) lpBitsArray = InitBitsArray()= GetDIBits (hMemDC, hMemBmp, 0, pnHeight,; lpBitsArray, @lcBInfo, DIB_RGB_COLORS) lcDocInfo = Chr(20) Repli(Chr(0), 19) && DOCINFO struct - 20 bytesIF StartDoc(hPrnDC, @lcDocInfo) > 0= StartPage(hPrnDC)= StretchDIBits (hPrnDC, xOffsPrn, yOffsPrn,; xOffsPrn Int(xScale * pnWidth),; yOffsPrn Int(yScale * pnHeight),;0,0, pnWidth, pnHeight,; lpBitsArray, @lcBInfo, DIB_RGB_COLORS, SRCCOPY)= EndPage(hPrnDC)= EndDoc(hPrnDC) ENDIF*-- 退出时释放系统资源= GlobalFree(lpBitsArray)= DeleteObject(hMemBmp)= DeleteDC(hMemDC)= DeleteDC(hPrnDC)= ReleaseDC(hwnd, hFormDC)RETURNPROCEDURE getWinRect (lnHwnd, lnWidth, lnHeight)*-- 返回指定句柄的窗口的宽和高#DEFINE maxDword 4294967295 && 0xffffffffLOCAL lpRect, lnLeft, lnTop, lnRight, lnBottom lpRect = REPLI (Chr(0), 16)= GetWindowRect (lnHwnd, @lpRect) lnRight = buf2dword(SUBSTR(lpRect, 9,4)) lnBottom = buf2dword(SUBSTR(lpRect, 13,4)) lnLeft = buf2dword(SUBSTR(lpRect, 1,4))IF lnLeft > lnRight lnLeft = lnLeft - maxDword ENDIF lnTop = buf2dword(SUBSTR(lpRect, 5,4))IF lnTop > lnBottom lnTop = lnTop - maxDword ENDIF lnWidth = lnRight - lnLeft lnHeight = lnBottom - lnTopRETURNFUNCTION getDefaultPrnDC* returns device context for the default printer #DEFINE PD_RETURNDC 256#DEFINE PD_RETURNDEFAULT 1024LOCAL lcStruct, lnFlags lnFlags = PD_RETURNDEFAULT PD_RETURNDC* fill PRINTDLG structure lcStruct = num2dword(66) Repli(Chr(0), 16) ; num2dword(lnFlags) Repli(Chr(0), 42)IF PrintDlg (@lcStruct) <> 0RETURN buf2dword (SUBSTR(lcStruct, 17,4)) ENDIFRETURN 0FUNCTION InitBitmapInfo(hTargetDC) #DEFINE BI_RGB 0#DEFINE RGBQUAD_SIZE 4 && RGBQUAD #DEFINE BHDR_SIZE 40 && BITMAPINFOHEADER LOCAL lnRgbQuadSize, lcRgbQuad, lcBIHdr* use printer BitPerPixel value lnBitsPerPixel = 24* initializing BitmapInfoHeader structure lcBIHdr = num2dword(BHDR_SIZE) ; num2dword(pnWidth) num2dword(pnHeight) ; num2word(1) num2word(lnBitsPerPixel) ; num2dword(BI_RGB) Repli(Chr(0), 20)* creating a buffer for the color tableIF lnBitsPerPixel <= 8lnRgbQuadSize = (2^lnBitsPerPixel) * RGBQUAD_SIZE lcRgbQuad = Repli(Chr(0), lnRgbQuadSize)ELSElcRgbQuad = '' ENDIFRETURN lcBIHdr lcRgbQuadPROCEDURE InitBitsArray() #DEFINE GMEM_FIXED 0LOCAL lnPtr, lnAllocSize* making sure the value is DWORD-aligned lnBytesPerScan = Int((pnWidth * lnBitsPerPixel)/8)IF Mod(lnBytesPerScan, 4) <> 0lnBytesPerScan = lnBytesPerScan 4 - Mod(lnBytesPerScan, 4) ENDIF lnAllocSize = pnHeight * lnBytesPerScan lnPtr = GlobalAlloc (GMEM_FIXED, lnAllocSize)= ZeroMemory (lnPtr, lnAllocSize)RETURN lnPtrFUNCTION num2word (lnValue)RETURN Chr(MOD(m.lnValue,256)) CHR(INT(m.lnValue/256))FUNCTION num2dword (lnValue) #DEFINE m0 256#DEFINE m1 65536#DEFINE m2 16777216LOCAL b0, b1, b2, b3 b3 = Int(lnValue/m2) b2 = Int((lnValue - b3*m2)/m1) b1 = Int((lnValue - b3*m2 - b2*m1)/m0) b0 = Mod(lnValue, m0)RETURN Chr(b0) Chr(b1) Chr(b2) Chr(b3)FUNCTION buf2word (lcBuffer)RETURN Asc(SUBSTR(lcBuffer, 1,1)) ;Asc(SUBSTR(lcBuffer, 2,1)) * 256FUNCTION buf2dword (lcBuffer)RETURN Asc(SUBSTR(lcBuffer, 1,1)) ;Asc(SUBSTR(lcBuffer, 2,1)) * 256 ;Asc(SUBSTR(lcBuffer, 3,1)) * 65536 ;Asc(SUBSTR(lcBuffer, 4,1)) * 16777216PROCEDURE decl && so many of them declared hereDECLARE INTEGER GetFocus IN user32DECLARE INTEGER EndDoc IN gdi32 INTEGER hdcDECLARE INTEGER GetWindowDC IN user32 INTEGER hwndDECLARE INTEGER DeleteObject IN gdi32 INTEGER hObjectDECLARE INTEGER CreateCompatibleDC IN gdi32 INTEGER hdcDECLARE INTEGER ReleaseDC IN user32 INTEGER hwnd, INTEGER hdcDECLARE INTEGER GetWindowRect IN user32 INTEGER hwnd, STRING @lpRectDECLARE INTEGER GlobalAlloc IN kernel32 INTEGER wFlags, INTEGER dwBytesDECLARE INTEGER GetDeviceCaps IN gdi32 INTEGER hdc, INTEGER nIndexDECLARE INTEGER SelectObject IN gdi32 INTEGER hdc, INTEGER hObjectDECLARE INTEGER StartDoc IN gdi32 INTEGER hdc, STRING @ lpdiDECLARE INTEGER GlobalFree IN kernel32 INTEGER hMemDECLARE INTEGER PrintDlg IN comdlg32 STRING @ lppdDECLARE INTEGER DeleteDC IN gdi32 INTEGER hdcDECLARE INTEGER StartPage IN gdi32 INTEGER hdcDECLARE INTEGER EndPage IN gdi32 INTEGER hdcDECLARE RtlZeroMemory IN kernel32 As ZeroMemory;INTEGER dest, INTEGER numBytesDECLARE INTEGER CreateCompatibleBitmap IN gdi32;INTEGER hdc, INTEGER nWidth, INTEGER nHeightDECLARE INTEGER BitBlt IN gdi32;INTEGER hDestDC, INTEGER x, INTEGER y,;INTEGER nWidth, INTEGER nHeight, INTEGER hSrcDC,;INTEGER xSrc, INTEGER ySrc, INTEGER dwRopDECLARE INTEGER StretchDIBits IN gdi32;INTEGER hdc, INTEGER XDest, INTEGER YDest,;INTEGER nDestWidth, INTEGER nDestHeight, INTEGER XSrc,;INTEGER YSrc, INTEGER nSrcWidth, INTEGER nSrcHeight,;INTEGER lpBits, STRING @lpBitsInfo,;INTEGER iUsage, INTEGER dwRopDECLARE INTEGER GetDIBits IN gdi32;INTEGER hdc, INTEGER hbmp, INTEGER uStartScan,;INTEGER cScanLines, INTEGER lpvBits, STRING @lpbi,;INTEGER uUsageRETURN && decl