[教学]：替换ACAD内部命令的方法...

XDSoft

2. 
   
3. Replacing Acad's Internal Commands  
   
4. ID    1957  
   
5. Applies to:    AutoCAD
   
6. AutoCAD 2000I
   
7. AutoCAD R14
   
8. 
   
9. Date    12/24/2001  
   
10. 
    
11. This document is part of    AcEd     
    
12. 
    
13. 
    
14. Question
    
15. How do I define my own commands that replace AutoCAD's ?
    
16. Answer
    
17. The ObjectARX API doesn't provide an ARX method to override an AutoCAD internal
    
18. command. This can only be achieved by using the "UNDEFINE" command. In the following
    
19. sample, undocumented function acedPostCommand() is used to post a lisp expression
    
20. that uses the UNDEFINE command to undefine the "OPEN" and "SAVEAS" command.
    
21. Also, ObjectARX does provide two functions to undefine certain type of commands,
    
22. they are:
    
23. 
    
24. 1)  acedUndef()
    
25. Undefines a function (an AutoLISP external function) that was previously defined
    
26. by a call to acedDefun().
    
27. 
    
28. 2) acedCmdUndefine().
    
29. acedCmdUndefine only works with ARX registered commands.
    
30. 
    
31. For example, if you want to override OPEN and SAVEAS commands, you need to do
    
32. the following:
    
33. 
    
34. 
    
35. // declare the following function
    
36. int acedPostCommand(const char*);
    
37. 
    
38. 
    
39. // place the following lines in acrxEntryPoint()'s case AcRx::kInitAppMsg:
    
40.   case AcRx::kInitAppMsg:
    
41.   acedPostCommand("(command "_undefine" "_open") ");   
    
42.   acedPostCommand("(command "_undefine" "_saveas") ");   
    
43. 
    
44. 
    
45. // ** do this always **
    
46.   acedRegCmds->addCommand("MYCOMMAND_GRP", "OPEN", "_OPEN", ACRX_CMD_MODAL, rx_open);
    
47.   acedRegCmds->addCommand("MYCOMMAND_GRP", "SAVE", "_SAVE",  ACRX_CMD_MODAL, rx_saveAs);
    
48.   acedRegCmds->addCommand("MYCOMMAND_GRP", "SAVEAS", "_SAVEAS", ACRX_CMD_MODAL, rx_saveAs);
    
49. 
    
50. 
    
51. 
    
52. 
    
53. 
    
54. #include <afxdlgs.h>
    
55. void rx_open()
    
56. {
    
57.   CFileDialog FDialog (TRUE, "dwg", "",OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, _T("AutoCAD Drawing Files (*.dwg)|*.dwg||"));
    
58.   
    
59.   if (FDialog.DoModal() == IDOK)
    
60.   {
    
61.    char* pFile = new char[512];
    
62.    strcpy(pFile, FDialog.GetPathName());
    
63.    if(acedSyncFileOpen(pFile) != Acad::eOk)
    
64.     acutPrintf("\nError open drawing file.");
    
65.    delete [] pFile;
    
66.   }
    
67. }
    
68. 
    
69. 
    
70. void rx_saveAs()
    
71. {
    
72.   CFileDialog FDialog (FALSE, "dwg", "",  
    
73.    OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
    
74.    _T("Save AutoCAD Drawing File As (*.dwg)|*.dwg||"));
    
75.   
    
76.   if (FDialog.DoModal() == IDOK)
    
77.   {
    
78.    char* pFile = new char[512];
    
79.    strcpy(pFile, FDialog.GetPathName());
    
80.    // user can obtain the database object through readDwgFile()
    
81.    // for an external database
    
82.    AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
    
83.    if(pDb->saveAs(pFile) != Acad::eOk)
    
84.     acutPrintf("\nError saving drawing file.");
    
85. 
    
86.    //clean up
    
87.    delete [] pFile;
    
88.   }
    
89. 
    
90. 
    
91. }
    
92. 
    
93. 
    
94. Note:
    
95. 
    
96. 1) You can always use the original native ACAD command by prefixing the command
    
97. name with a "." even if it is already undefined.
    
98. 2) The above code runs only in SDI mode due to the use of acedSyncFileOpen() method.
    
99. 
    

<br /> Replacing Acad's Internal Commands  <br /> ID    1957  <br /> Applies to:    AutoCAD <br /> AutoCAD 2000I<br /> AutoCAD R14<br /> <br /> Date    12/24/2001  <br /> <br /> This document is part of    AcEd     <br /> <br /> <br /> Question <br /> How do I define my own commands that replace AutoCAD's ?<br /> Answer <br /> The ObjectARX API doesn't provide an ARX method to override an AutoCAD internal <br /> command. This can only be achieved by using the "UNDEFINE" command. In the following <br /> sample, undocumented function acedPostCommand() is used to post a lisp expression <br /> that uses the UNDEFINE command to undefine the "OPEN" and "SAVEAS" command. <br /> Also, ObjectARX does provide two functions to undefine certain type of commands, <br /> they are:<br /> <br /> 1)  acedUndef()<br /> Undefines a function (an AutoLISP external function) that was previously defined <br /> by a call to acedDefun().<br /> <br /> 2) acedCmdUndefine().<br /> acedCmdUndefine only works with ARX registered commands.<br /> <br /> For example, if you want to override OPEN and SAVEAS commands, you need to do <br /> the following:<br /> <br /> <br /> // declare the following function<br /> int acedPostCommand(const char*); <br /> <br /> <br /> // place the following lines in acrxEntryPoint()'s case AcRx::kInitAppMsg:<br />   case AcRx::kInitAppMsg: <br />   acedPostCommand("(command "_undefine" "_open") ");   <br />   acedPostCommand("(command "_undefine" "_saveas") ");   <br /> <br /> <br /> // ** do this always **<br />   acedRegCmds->addCommand("MYCOMMAND_GRP", "OPEN", "_OPEN", ACRX_CMD_MODAL, rx_open);<br />   acedRegCmds->addCommand("MYCOMMAND_GRP", "SAVE", "_SAVE",  ACRX_CMD_MODAL, rx_saveAs);<br />   acedRegCmds->addCommand("MYCOMMAND_GRP", "SAVEAS", "_SAVEAS", ACRX_CMD_MODAL, rx_saveAs);<br /> <br /> <br /> <br /> <br /> <br /> #include <afxdlgs.h> <br /> void rx_open() <br /> { <br />   CFileDialog FDialog (TRUE, "dwg", "",OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, _T("AutoCAD Drawing Files (*.dwg)|*.dwg||")); <br />   <br />   if (FDialog.DoModal() == IDOK) <br />   { <br />    char* pFile = new char[512]; <br />    strcpy(pFile, FDialog.GetPathName()); <br />    if(acedSyncFileOpen(pFile) != Acad::eOk) <br />     acutPrintf("\nError open drawing file."); <br />    delete [] pFile; <br />   } <br /> } <br /> <br /> <br /> void rx_saveAs() <br /> { <br />   CFileDialog FDialog (FALSE, "dwg", "",  <br />    OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, <br />    _T("Save AutoCAD Drawing File As (*.dwg)|*.dwg||")); <br />   <br />   if (FDialog.DoModal() == IDOK) <br />   { <br />    char* pFile = new char[512]; <br />    strcpy(pFile, FDialog.GetPathName()); <br />    // user can obtain the database object through readDwgFile()<br />    // for an external database<br />    AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();<br />    if(pDb->saveAs(pFile) != Acad::eOk) <br />     acutPrintf("\nError saving drawing file."); <br /> <br />    //clean up<br />    delete [] pFile; <br />   } <br /> <br /> <br /> }<br /> <br /> <br /> Note:<br /> <br /> 1) You can always use the original native ACAD command by prefixing the command <br /> name with a "." even if it is already undefined.<br /> 2) The above code runs only in SDI mode due to the use of acedSyncFileOpen() method.<br /> <br />