轉換內存流爲「字符串」我們有下面的代碼之前,德爾福2009年:在Delphi 2009年
<span style="font: 10pt Courier New;"><span class="pas1-reservedword">function</span><span class="pas1-space"> </span><span class="pas1-identifier">MemoryStreamToString(M:</span><span class="pas1-space"> </span><span class="pas1-identifier">TMemoryStream):</span><span class="pas1-space"> </span><span class="pas1-reservedword">String</span><span class="pas1-symbol">;
</span><span class="pas1-reservedword">var
</span><span class="pas1-space"> </span><span class="pas1-identifier">NewCapacity:</span><span class="pas1-space"> </span><span class="pas1-identifier">Longint;
</span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> </span><span class="pas1-symbol">(M.Size</span><span class="pas1-space"> </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-number">0)</span><span class="pas1-space"> </span><span class="pas1-reservedword">or</span><span class="pas1-space"> </span><span class="pas1-symbol">(M.Memory</span><span class="pas1-space"> </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-reservedword">nil</span><span class="pas1-symbol">)</span><span class="pas1-space"> </span><span class="pas1-reservedword">then
</span><span class="pas1-space"> </span><span class="pas1-identifier">Result:=</span><span class="pas1-space"> </span><span class="pas1-string">''
</span><span class="pas1-space"> </span><span class="pas1-reservedword">else
</span><span class="pas1-space"> </span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> </span><span class="pas1-identifier">TMemoryStreamProtected(M).Capacity</span><span class="pas1-space"> </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-identifier">M.Size</span><span class="pas1-space"> </span><span class="pas1-reservedword">then
</span><span class="pas1-space"> </span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> </span><span class="pas1-identifier">NewCapacity:=</span><span class="pas1-space"> </span><span class="pas1-identifier">M.Size+1;
</span><span class="pas1-space"> </span><span class="pas1-identifier">TMemoryStreamProtected(M).Realloc(NewCapacity);
</span><span class="pas1-space"> </span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-identifier">NullString(M.Memory^)[M.Size]:=</span><span class="pas1-space"> </span><span class="pas1-character">#0;
</span><span class="pas1-space"> </span><span class="pas1-identifier">Result:=</span><span class="pas1-space"> </span><span class="pas1-identifier">StrPas(M.Memory);
</span><span class="pas1-space"> </span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;
</span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;
</span></span>
我們如何把這段代碼轉換德爾福2009年爲支持Unicode現在?
我已經做了很多Delphi內存的東西,但我沒有聽說過SetString,總是使用SetLength(dest,length)和Move(src,@(dest [1]),length);其中SetString也可以(將它稱爲_LStrFromPCharLen) – 2009-04-09 08:39:45
類型化爲PChar,不應該產生任何問題。 – 2009-04-09 12:52:31
指針與所有內容兼容。您需要進行類型轉換的唯一原因是編譯器在重載解析時遇到問題。 – 2009-04-09 14:18:40