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分享怎样提取Windows注册表的REG_MULTI_SZ类型值?
以下是我找到并修改过的代码：
2、如果将_T("SystemBiosVersion")改为一个REG_SZ类型如"VideoBiosVersion"，就能正常提取这项的值。
请高手们看看问题出在哪里？
HKEY hKEY1=NULL;
LPCTSTR data_bios = _T("HARDWARE\\DESCRIPTION\\System\\");
long ret_bios0 = (::RegOpenKeyEx(HKEY_LOCAL_MACHINE, data_bios, 0, KEY_READ, &hKEY1));
if (ret_bios0 != ERROR_SUCCESS)
{
AfxMessageBox(_T("无法打开有关的hKEY1"));
return;
}
LPBYTE bios1_Data = new BYTE[80]; //定义用户姓名 owner_Data
DWORD type_bios1 = REG_MULTI_SZ; //定义数据类型
DWORD cbData_bios1 = 100; //定义数据长度
long ret_bios1 = ::RegQueryValueEx(hKEY1, _T("SystemBiosVersion"), 0, &type_bios1, bios1_Data, &cbData_bios1);
if (ret_bios1 != ERROR_SUCCESS)
{
AfxMessageBox(_T("无法查询注册表BIOS信息"));
OnCancel();
//return;
}
2、如果将_T("SystemBiosVersion")改为一个REG_SZ类型如"VideoBiosVersion"，就能正常提取这项的值。
请高手们看看问题出在哪里？
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brk1985 2016-10-26
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出错时，查dwError值，就能大致判断出是什么原因的错误了。
「已注销」 2016-10-26
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测试是没问题的：BYTE *lpResult = new BYTE[cbData](); // 末尾少了分号
「已注销」 2016-10-26
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#include <stdio.h>
#include <tchar.h>
#include <windows.h>
void DisplayMultiString(
PCTSTR pszInfo
)
{
if (pszInfo != NULL)
{
while (*pszInfo != _T('\0'))
{
_ftprintf(stdout, _T("%s\n"), pszInfo);
do {
pszInfo++;
} while (*pszInfo);
pszInfo++;
}
}
}
int main(int argc, char *argv[])
{
HKEY hKey = NULL;
TCHAR szSubKey[] = _T("HARDWARE\\DESCRIPTION\\System");
DWORD dwError = RegOpenKeyEx(HKEY_LOCAL_MACHINE, szSubKey, 0, KEY_READ, &hKey);
if (dwError == NO_ERROR)
{
DWORD dwType = 0;
DWORD cbData = 0;
TCHAR szValue[] = _T("SystemBiosVersion");
dwError = RegQueryValueEx(hKey, szValue, NULL, &dwType, NULL, &cbData);
if ((dwError == NO_ERROR) && (dwType == REG_MULTI_SZ))
{
BYTE *lpResult = new BYTE[cbData]()
dwError = RegQueryValueEx(hKey, szValue, NULL, NULL, (BYTE *)lpResult, &cbData);
switch (dwError) {
case NO_ERROR:
AfxMessageBox(_T("操作成功！"));
DisplayMultiString((PCTSTR)lpResult);
break;
case ERROR_MORE_DATA:
AfxMessageBox(_T("空间不足！"));
break;
case ERROR_FILE_NOT_FOUND:
AfxMessageBox(_T("值不存在！"));
break;
default:
break;
}
delete[] lpResult;
}
RegCloseKey(hKey);
}
return 0;
}
赵4老师 2016-10-12
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崩溃的时候在弹出的对话框按相应按钮进入调试，按Alt+7键查看Call Stack即“调用堆栈”里面从上到下列出的对应从里层到外层的函数调用历史。双击某一行可将光标定位到此次调用的源代码或汇编指令处，看不懂时双击下一行，直到能看懂为止。
iqy 2016-10-12
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感谢visualeleven和sxjiake，这两种都会出现断点。
Eleven 2016-10-12
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If data has the REG_SZ, REG_MULTI_SZ, or REG_EXPAND_SZ type, the string may not have been stored with the proper terminating null characters. Therefore, when reading a string from the registry, you must ensure that the string is properly terminated before using it; otherwise, it may overwrite a buffer. (Note that REG_MULTI_SZ strings should have two terminating null characters.)
When writing a string to the registry, you must specify the length of the string, including the terminating null character (\0). A common error is to use the strlen function to determine the length of the string, but to forget that strlen returns only the number of characters in the string, not including the terminating null. Therefore, the length of the string should be calculated as follows: strlen( string ) + 1
A REG_MULTI_SZ string ends with a string of length 0. Therefore, it is not possible to include a zero-length string in the sequence. An empty sequence would be defined as follows: \0.
「已注销」 2016-10-07
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如楼上所示，所提供的地址空间不足，而且你明明是 80 为什么要传 100 进去呢？万一真的大小在 80~100 之间，程序就崩溃了。还有，那个注册表类型的值是返回输出用的，让你可以检查这个值的类型是不是你所需要的，而不是让你在输入时指定 REG_MULTI_SZ。
DWORD dwType;
DWORD cbData = 1024;
LPBYTE lpData = new BYTE[cbData];
DWORD dwError = RegQueryValueEx(hKey, _T("SystemBiosVersion"), 0, &dwType, lpData, &cbData);
switch (dwError) {
case ERROR_SUCCESS:
AfxMessageBox(_T("操作成功！"));
break;
case ERROR_MORE_DATA:
AfxMessageBox(_T("空间不足！"));
break;
case ERROR_FILE_NOT_FOUND:
AfxMessageBox(_T("值不存在！"));
break;
default:
break;
}Eleven 2016-10-02
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TCHAR* bios1_Data = NULL;
DWORD type_bios1 = REG_MULTI_SZ;
DWORD cbData_bios1 = 0;
long ret_bios1 = ::RegQueryValueEx(hKEY1, _T("SystemBiosVersion"), 0, &type_bios1, NULL, &cbData_bios1);
bios1_Data = new TCHAR[ret_bios1];
memset(bios1_Data, 0, ret_bios1);
ret_bios1 = ::RegQueryValueEx(hKEY1, _T("SystemBiosVersion"), 0, &type_bios1, (LPBYTE)bios1_Data, &cbData_bios1);
if (ret_bios1 != ERROR_SUCCESS)
{
AfxMessageBox(_T("无法查询注册表BIOS信息"));
OnCancel();
}
