[求助]：怎么提取AcDbMText实体中的文字

urgod

AcDbMText实体中包含了很多格式代码，如果我只想读出其中的文字内容该怎么办办，望高手指点
AcDbMText中的函数contents(),帮助文档是这么说的：

char *

contents() const;

Returns a pointer to a dynamically allocated buffer containing a copy of the character contents of the MText object. Formatting data used for word wrap calculations is removed before the string is copied.

也就是说，它返回的应该是其中的文字内容，也就是我需要的，但是，我跟踪了一下，返回的文字里面包含了控制格式的代码：（

照猫画虎

把控制格式的东西虑掉就行啦

binbin

这样很难！！！我想了很久，给个思路吧！
做一个派生实体。
克隆一个Mtext。
用这个派生实体调用Mtext的explode，返回的entitySet里放的是AcDbText对象指针(多个)。这样就好办了！

hothua

去熟悉熟悉一下ASCII编码，过滤控制字符应该不难

urgod

binbin的思路很好， 我在ADN上也提了这个问题，很多人都是这么想的：

可以参考一下下面这段代码：

2. [font=courier new]
   
3. // Append a new entity to the model space
   
4. // and close it.
   
5. void PostToMs(AcDbEntity *pEnt)
   
6. {
   
7. AcDbBlockTable *pTable;
   
8. AcDbBlockTableRecord *pRecord; acdbCurDwg()->getBlockTable(pTable, AcDb::kForRead);
   
9. pTable->getAt(ACDB_MODEL_SPACE, pRecord, AcDb::kForWrite);
   
10. pTable->close();
    
11. pRecord->appendAcDbEntity(pEnt);
    
12. pRecord->close();
    
13. pEnt->close();
    
14. }// This function creates a new text style
    
15. // for an MTEXT fragment.
    
16. // NOTE: This function fails when using
    
17. //     TrueType fonts (the font and bigfont
    
18. //     member contains an empty string).
    
19. AcDbObjectId CreateStyle(AcDbMTextFragment *frag)
    
20. {
    
21. if (!frag)
    
22.    return AcDbObjectId::kNull; static int counter = 0;
    
23. char buffer[33];
    
24. AcDbTextStyleTableRecord *pStyle = new AcDbTextStyleTableRecord; // Create and set name
    
25. itoa(counter++, buffer, 10);
    
26. pStyle->setName(buffer); // Set parameters
    
27. if (frag->font)
    
28.    pStyle->setFileName(frag->font);
    
29. else
    
30.    pStyle->setFileName("txt.shx");
    
31. if (frag->bigfont)
    
32.    pStyle->setBigFontFileName(frag->bigfont); ads_printf("\nFont: %s", frag->font); // Append the new style to the style table
    
33. AcDbObjectId styleId;
    
34. AcDbTextStyleTable *pTable; acdbCurDwg()->getTextStyleTable(pTable, AcDb::kForWrite);
    
35. pTable->add(styleId, pStyle);
    
36. pTable->close();
    
37. pStyle->close(); return styleId;
    
38. }// This function is the callback function for
    
39. // explodeFragments(). Here you will get the
    
40. // MTEXT fragments
    
41. int MTextEnum(AcDbMTextFragment *frag, void *param)
    
42. {
    
43. AcDbText *pText = new AcDbText;
    
44. AcDbObjectId styleId = CreateStyle(frag); if (styleId == AcDbObjectId::kNull)
    
45.    return 1; pText->setTextString(frag->text);
    
46. pText->setPosition(frag->location);
    
47. pText->setNormal(frag->normal);
    
48. pText->setOblique(frag->obliqueAngle);
    
49. pText->setWidthFactor(frag->widthFactor);
    
50. pText->setColorIndex(frag->colorIndex);
    
51. pText->setHeight(frag->capsHeight);
    
52. pText->setTextStyle(styleId); PostToMs(pText); return 1;
    
53. }void expmtext()
    
54. {
    
55. // Let the user select an MTEXT entity ads_name ename;
    
56. ads_point pt; if (RTNORM != acedEntSel("\nSelect a mtext entity: ", ename, pt))
    
57.    return; AcDbObjectId objId;
    
58. AcDbEntity *pEnt; acdbGetObjectId(objId, ename);
    
59. if (Acad::eOk != acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead)) {
    
60.    ads_printf("\nCannot open selected entity.");
    
61.    return;
    
62. } if (!pEnt->isKindOf(AcDbMText::desc())) {
    
63.    ads_printf("\nSelected entity is not a mtext entity.");
    
64.    pEnt->close();
    
65.    return;
    
66. } AcDbMText *pMText = (AcDbMText*) pEnt; // Get every MTEXT fragment
    
67. pMText->explodeFragments(MTextEnum, NULL); pMText->close();
    
68. }
    
69. [/font]

[font=courier new]<br /> // Append a new entity to the model space<br /> // and close it.<br /> void PostToMs(AcDbEntity *pEnt)<br /> {<br /> AcDbBlockTable *pTable;<br /> AcDbBlockTableRecord *pRecord; acdbCurDwg()->getBlockTable(pTable, AcDb::kForRead);<br /> pTable->getAt(ACDB_MODEL_SPACE, pRecord, AcDb::kForWrite);<br /> pTable->close();<br /> pRecord->appendAcDbEntity(pEnt);<br /> pRecord->close();<br /> pEnt->close();<br /> }// This function creates a new text style<br /> // for an MTEXT fragment.<br /> // NOTE: This function fails when using<br /> //     TrueType fonts (the font and bigfont<br /> //     member contains an empty string).<br /> AcDbObjectId CreateStyle(AcDbMTextFragment *frag)<br /> {<br /> if (!frag)<br />    return AcDbObjectId::kNull; static int counter = 0;<br /> char buffer[33];<br /> AcDbTextStyleTableRecord *pStyle = new AcDbTextStyleTableRecord; // Create and set name<br /> itoa(counter++, buffer, 10);<br /> pStyle->setName(buffer); // Set parameters<br /> if (frag->font)<br />    pStyle->setFileName(frag->font);<br /> else<br />    pStyle->setFileName("txt.shx");<br /> if (frag->bigfont)<br />    pStyle->setBigFontFileName(frag->bigfont); ads_printf("\nFont: %s", frag->font); // Append the new style to the style table<br /> AcDbObjectId styleId;<br /> AcDbTextStyleTable *pTable; acdbCurDwg()->getTextStyleTable(pTable, AcDb::kForWrite);<br /> pTable->add(styleId, pStyle);<br /> pTable->close();<br /> pStyle->close(); return styleId;<br /> }// This function is the callback function for<br /> // explodeFragments(). Here you will get the<br /> // MTEXT fragments<br /> int MTextEnum(AcDbMTextFragment *frag, void *param)<br /> {<br /> AcDbText *pText = new AcDbText;<br /> AcDbObjectId styleId = CreateStyle(frag); if (styleId == AcDbObjectId::kNull)<br />    return 1; pText->setTextString(frag->text);<br /> pText->setPosition(frag->location);<br /> pText->setNormal(frag->normal);<br /> pText->setOblique(frag->obliqueAngle);<br /> pText->setWidthFactor(frag->widthFactor);<br /> pText->setColorIndex(frag->colorIndex);<br /> pText->setHeight(frag->capsHeight);<br /> pText->setTextStyle(styleId); PostToMs(pText); return 1;<br /> }void expmtext()<br /> {<br /> // Let the user select an MTEXT entity ads_name ename;<br /> ads_point pt; if (RTNORM != acedEntSel("\nSelect a mtext entity: ", ename, pt))<br />    return; AcDbObjectId objId;<br /> AcDbEntity *pEnt; acdbGetObjectId(objId, ename);<br /> if (Acad::eOk != acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead)) {<br />    ads_printf("\nCannot open selected entity.");<br />    return;<br /> } if (!pEnt->isKindOf(AcDbMText::desc())) {<br />    ads_printf("\nSelected entity is not a mtext entity.");<br />    pEnt->close();<br />    return;<br /> } AcDbMText *pMText = (AcDbMText*) pEnt; // Get every MTEXT fragment<br /> pMText->explodeFragments(MTextEnum, NULL); pMText->close();<br /> }<br /> [/font]

XDSoft

最初由 binbin 发布
[B]这样很难！！！我想了很久，给个思路吧！
做一个派生实体。
克隆一个Mtext。
用这个派生实体调用Mtext的explode，返回的entitySet里放的是AcDbText对象指针(多个)。这样就好办了！ [/B]

不用派生，克隆吧，直接explode 就可以了，生成临时的AcDbText 得到后，释放掉就可以了。

hcsjy-zyg

太复杂了，不明白

vitue

呵呵，学习了。。。

yswang

看看