我有一个asp页面访问C++代码,并得到一个xml字符串返回。无论何时访问网页,我都会在Web浏览器中看到超时。For循环非常缓慢,并导致asp超时
我想我知道这个问题,但不知道如何解决它。我不确定xml字符串有多大,所以我不确定用什么大小来声明变量来保存它,所以我声明iDataBufferSize是我可以做到的最大值。
下面的函数有一个for循环,它创建一个返回到asp代码的xml字符串。
for循环需要经过大约500行,我认为当它碰到这行wcscat_s(wDataBuffer,iSize,wBuffer)时,它会启动磁盘交换并减慢for循环。
我知道,当我使iDataBufferSize变小时,它可以工作,但恐怕我不会为xml字符串制作足够大的缓冲区。
感谢 -Dimitry
LPWCH wLargeDataBuffer = 0;
char *cLargeCBuffer = 0;
size_t iDataBufferSize = 93276800;
wLargeDataBuffer = new WCHAR[iDataBufferSize];
cLargeCBuffer = new char[iDataBufferSize];
memset(wLargeDataBuffer, 0, iDataBufferSize);
memset(cLargeCBuffer, 0, iDataBufferSize);
iDataLen = getCServPBJList(wLargeDataBuffer, iDataBufferSize);
int CAdminConsoleInterface::getCServPBJList(LPWCH wDataBuffer, size_t iSize) {
wcscpy_s(wDataBuffer, iSize, L"<jobsList>");
houseKeeper->getCServJobsXML(wDataBuffer, iSize, configHandler->getTextValue (L"UniqueID"), L'P');
wcscat_s(wDataBuffer, iSize, L"</jobsList>");
return wcslen(wDataBuffer);
}
int CHouseKeeper::getCServJobsXML(LPWCH wDataBuffer, size_t iSize, LPWCH wLocation, WCHAR wPrefix) {
WCHAR wIndexPath[1024];
WCHAR wBuffer[1024];
LPWCH wTempBuffer = new WCHAR[16384];
int rc;
char *zErrMsg=0;
char **results;
int nrow=0, ncol=0;
char cSQLDB[1024];
sqlite3 *CServDB;
size_t convertedChars=0;
size_t origsize;
cout << "Looking up CServ jobs." << endl;
getIndexPath(wIndexPath, 1024);
wcscat_s(wIndexPath, 1024, L"CServ.db");
WideCharToMultiByte(CP_UTF8, 0, wIndexPath, -1, cSQLDB, PATH_LENGTH, 0,0);
//cout << "Opening DB: " << cSQLDB << endl;
rc = sqlite3_open(cSQLDB, &CServDB);
if (rc != SQLITE_OK)
{
cout << "Error opening DB." << endl;
return -1;
}
rc = sqlite3_get_table(CServDB, "SELECT * FROM OServ_jobs;", &results, &nrow, &ncol, &zErrMsg);
//cout << "nrow: " << nrow << " - ncol: " << ncol << endl;
for (int i=1; i<=nrow; i++) {
origsize = strlen(results[1+(ncol*i)]) + 1;
mbstowcs_s(&convertedChars, wBuffer, origsize, results[1+(ncol*i)], 1024);
wcscat_s(wDataBuffer, iSize, L"<job id=\"");
wcscat_s(wDataBuffer, iSize, CHelper::escapeXMLData(wBuffer, wTempBuffer, 16384));
wcscat_s(wDataBuffer, iSize, L"\" type=\"");
//wcout << "JobID: " << wBuffer << endl;
origsize = strlen(results[4+(ncol*i)]) + 1;
mbstowcs_s(&convertedChars, wBuffer, origsize, results[4+(ncol*i)], 1024);
wcscat_s(wDataBuffer, iSize, wBuffer);
//wcout << "Type: " << wBuffer << endl;
wcscat_s(wDataBuffer, iSize, L"\">");
origsize = strlen(results[(ncol*i)]) + 1;
mbstowcs_s(&convertedChars, wBuffer, origsize, results[(ncol*i)], 1024);
wcscat_s(wDataBuffer, iSize, L"<currentLocation>");
wcscat_s(wDataBuffer, iSize, wBuffer);
//wcout << "Location: " << wBuffer << endl;
wcscat_s(wDataBuffer, iSize, L"</currentLocation>");
wcscat_s(wDataBuffer, iSize, L"<date>");
origsize = strlen(results[2+(ncol*i)]) + 1;
mbstowcs_s(&convertedChars, wBuffer, origsize, results[2+(ncol*i)], 1024);
wcscat_s(wDataBuffer, iSize, wBuffer);
//wcout << "Date: " << wBuffer << endl;
wcscat_s(wDataBuffer, iSize, L"</date>");
wcscat_s(wDataBuffer, iSize, L"<time>");
origsize = strlen(results[3+(ncol*i)]) + 1;
mbstowcs_s(&convertedChars, wBuffer, origsize, results[3+(ncol*i)], 1024);
wcscat_s(wDataBuffer, iSize, wBuffer);
//wcout << "Time: " << wBuffer << endl;
wcscat_s(wDataBuffer, iSize, L"</time>");
wcscat_s(wDataBuffer, iSize, L"</job>");
memset(wBuffer, 0, 1024);
memset(wTempBuffer, 0, 16384);
}
//wcout << "Data: " << wDataBuffer << endl;
delete []wTempBuffer;
sqlite3_free_table(results);
sqlite3_close(CServDB);
return wcslen(wDataBuffer);
}
请使用'std :: string'或'std :: vector';从来不删除东西。 – GManNickG