powerbuilder - 给定某些字体，PowerBuilder 中的列被截断

Question

我有一个专栏varchar(5000)。在 PowerBuilder 数据窗口中。4600当字号为 12 时，字符串长度大于此列的显示将被截断。

但是当字体大小为 8 时，它会显示该列的所有值/内容。

我想确认我的想法是 PB 限制。

Answer 1

您可以检查未正确显示的字符串的显示大小是否超过了显着值。我怀疑如果字符串超过 32768/65536 单位宽度，它可能会在 PB “绘制”列值时被截断......

这是一些以像素和单位进行测试的代码，使用与 DW 中相同的字体名称和大小来调用它：

public function long of_getstringwidth (window aw_parent, string as_text, string as_fontname, integer ai_size, boolean ab_bold, boolean ab_italic);// computes the width in pixels of a string as drawn in the specified font

ulong ll_handle, ll_hdc, ll_hdcbis
ulong ll_hfont
ulong weight
long height
long width = -1
st_size size

ll_handle = handle(aw_parent)
ll_hdc = GetDC(ll_handle)

// create the specified font
if ab_bold then weight = FW_BOLD else weight = FW_NORMAL
// compute the height using the display device physical properties
height = -MulDiv(ai_size, GetDeviceCaps(ll_hdc, LOGPIXELSX), 72)
ll_hfont = CreateFont( height, 0, 0, 0, weight, ab_italic, false, false, 0, DEFAULT_CHARSET, 0, 0, 0, as_fontname)
// use that font for the device context
SelectObject(ll_hdc, ll_hfont)

if GetTextExtentPoint32(ll_hdc, as_text, len(as_text), size) then
    width = size.cx + 1 //add 1 is better, look trhough MSDN for clues ;o)
end if

ReleaseDC(ll_handle, ll_hdc)

return width

end function

public function long of_getstringwidthunits (window aw_parent, string as_text, string as_fontname, integer ai_size, boolean ab_bold, boolean ab_italic);// computes the size in pixels of a string as drawn in the specified font
// returns a result in PB units

long width = -1

width = of_getstringwidth(aw_parent, as_text, as_fontname, ai_size, ab_bold, ab_italic)
width = PixelsToUnits(width, XPixelsToUnits!) 

return width

end function

以下是所需的外部函数和声明（希望我没有错过任何一个，但可以在平台 SDK/MSDN 中检索这些值）：

Function ULong GetDC(ULong hWnd) Library "User32.DLL"
Function ULong ReleaseDC(ULong hWnd, ULong hDC) Library "User32.DLL"
function long MulDiv(long nNumber, long nNumerator, int nDenominator) library "kernel32.dll"
Function ulong CreateFont(long nHeight,ulong nWidth,ulong nEscapement,ulong nOrientation,ulong fnWeight,boolean fdwItalic,boolean fdwUnderline,boolean fdwStrikeOut,ulong fdwCharSet,ulong fdwOutputPrecision,ulong fdwClipPrecision,ulong fdwQuality,ulong dwPitchAndFamily,ref string lpszFace) LIBRARY "gdi32.dll" ALIAS FOR "CreateFontW"  
Function Ulong SelectObject (Ulong hDC, Ulong hObject) Library "gdi32.dll"
Function Boolean GetTextExtentpoint32(ULong hdc, string lpString, int cbString, ref ST_SIZE lpSize) library "gdi32.dll" alias for "GetTextExtentPoint32W"
Function ulong GetDeviceCaps(ulong hdc,ulong nIndex) library "gdi32.dll"
constant integer FW_NORMAL     = 400
constant integer FW_BOLD       = 700
constant ulong LOGPIXELSX = 88  //Number of pixels per logical inch along the screen width.
constant ulong DEFAULT_CHARSET     = 1   //(x01)

该代码是我放置许多 GDI 函数的用户对象的一部分。如果有人感兴趣，我可以分享它的代码。