中国DOS联盟

DOS6.2 + BC3.1

实际项目中是图形界面，drive=0,1 时（A：，B：），_chdrivee有效，
但_dos_getdiskfree出错，应该是在执行21号中断是提示出错信息(General failure reaing drive A)，破坏图形环境。
另外用 DUSE49 加载驱动参数为 drivers=3,则后两个盘符也会提示出错信息（Invalid unit reading drive F）。

Windows XP 下执行是光驱和虚拟光驱报错。

有什么办法不出现提示信息？自己知道这个驱动器不能用就行了。

代码如下：

C/C++ code // crt_getdrive.c // compile with: /c // Illustrates drive functions including: // _getdrive _chdrive _getdcwd // #include <dos.h> #include <stdio.h> #include <direct.h> #include <stdlib.h> #include <ctype.h> int main( void ) { int ch, drive, curdrive; long LM; static char path; struct diskfree_t diskspace; curdrive = _getdrive(); // Save current drive. for( drive = 1; drive <= 26; drive++ ) // If we can switch to the drive, it exists. { if( !_chdrive( drive ) ) { printf( "%c:", drive + 'A' - 1 ); if( _getdcwd( drive, path, _MAX_PATH ) != NULL ) printf( " (Current directory is %s)", path ); if(0==_dos_getdiskfree(drive,&diskspace)) { LM=(unsigned long)(diskspace.avail_clusters) *(unsigned long)(diskspace.sectors_per_cluster) *(unsigned long)(diskspace.bytes_per_sector)/1024/1024; printf( " %ld MBytes free",LM); } putchar( '\n' ); } } _chdrive( curdrive ); // Restore original drive. }

// crt_getdiskfree.c // compile with: /c #include <windows.h> #include <direct.h> #include <stdio.h> #include <tchar.h> TCHAR g_szBorder = _T("======================================================================\n"); TCHAR g_szTitle1 = _T("|DRIVE|TOTAL CLUSTERS|AVAIL CLUSTERS|SECTORS / CLUSTER|BYTES / SECTOR|\n"); TCHAR g_szTitle2 = _T("|=====|==============|==============|=================|==============|\n"); TCHAR g_szLine = _T("| A: | | | | |\n"); void utoiRightJustified(TCHAR* szLeft, TCHAR* szRight, unsigned uVal); int main(int argc, char* argv) { TCHAR szMsg; struct _diskfree_t df = {0}; ULONG uDriveMask = _getdrives(); unsigned uErr, uLen, uDrive; printf(g_szBorder); printf(g_szTitle1); printf(g_szTitle2); for (uDrive=1; uDrive<=26; ++uDrive) { if (uDriveMask & 1) { uErr = _getdiskfree(uDrive, &df); memcpy(szMsg, g_szLine, sizeof(g_szLine)); szMsg = uDrive + 'A' - 1; if (uErr == 0) { utoiRightJustified(szMsg+8, szMsg+19, df.total_clusters); utoiRightJustified(szMsg+23, szMsg+34, df.avail_clusters); utoiRightJustified(szMsg+38, szMsg+52, df.sectors_per_cluster); utoiRightJustified(szMsg+56, szMsg+67, df.bytes_per_sector); } else { uLen = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, uErr, 0, szMsg+8, 4100, NULL); szMsg = ' '; szMsg = ' '; szMsg = ' '; } printf(szMsg); } uDriveMask >>= 1; } printf(g_szBorder); } void utoiRightJustified(TCHAR* szLeft, TCHAR* szRight, unsigned uVal) { TCHAR* szCur = szRight; int nComma = 0; if (uVal) { while (uVal && (szCur >= szLeft)) { if (nComma == 3) { *szCur = ','; nComma = 0; } else { *szCur = (uVal % 10) | 0x30; uVal /= 10; ++nComma; } --szCur; } } else { *szCur = '0'; --szCur; } if (uVal) { szCur = szLeft; while (szCur <= szRight) { *szCur = '*'; ++szCur; } } }

结果如下，中间未提示错误信息，这样就好

======================================================================
|DRIVE|TOTAL CLUSTERS|AVAIL CLUSTERS|SECTORS / CLUSTER|BYTES / SECTOR|
|=====|==============|==============|=================|==============|
| C: | 7,681,070 | 5,276,989 | 8 | 512 |
| D: | 23,041,218 | 18,417,512 | 8 | 512 |
| E: | 23,041,218 | 16,398,257 | 8 | 512 |
| F: | 21,818,270 | 2,858,339 | 8 | 512 |
| G: | 2,560,351 | 2,543,733 | 8 | 512 |
| H: | 设备未就绪。 | | |
| I: | 设备未就绪。 | | |
======================================================================