请问RegQueryValueEX这个函数读REG_SZ值是乱码是怎么回事

mortimer7866 2015-11-11 07:41:13

在最后一步输出的时候程序停止运行，单步调试发现读出的data中是乱码，请大神帮忙解决

#include <windows.h>

#include <string>

#include <iostream>

using namespace std;



string GetVal(HKEY hKey, LPCTSTR lpValue)			//读取当前注册表键值

{

	string data;

	DWORD size = 200;

	DWORD type = REG_SZ;

	LONG nError = RegQueryValueEx(hKey, lpValue, NULL, &type, (LPBYTE)&data, &size);



	if (nError == ERROR_FILE_NOT_FOUND)

		data = "file not found"; // The value will be created and set to data next time SetVal() is called.

	else if (nError)

		return "read error";

	/*cout << "Error: " << nError << " Could not get registry value " << (char*)lpValue << endl;*/



	return data;

}



int main()

{

	HKEY hKey;

	RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control\\Class\\{4d36e972-e325-11ce-bfc1-08002be10318}\\0000", 0, KEY_WOW64_64KEY | KEY_ALL_ACCESS, &hKey);

	cout<<GetVal(hKey, L"DriverDesc")<<endl;

}

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赵4老师 2016-03-22

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void HexDump(char *buf,int len,int addr) {
    int i,j,k;
    char binstr[80];

    for (i=0;i<len;i++) {
        if (0==(i%16)) {
            sprintf(binstr,"%08x -",i+addr);
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        } else if (15==(i%16)) {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
            sprintf(binstr,"%s  ",binstr);
            for (j=i-15;j<=i;j++) {
                sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
            }
            printf("%s\n",binstr);
        } else {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        }
    }
    if (0!=(i%16)) {
        k=16-(i%16);
        for (j=0;j<k;j++) {
            sprintf(binstr,"%s   ",binstr);
        }
        sprintf(binstr,"%s  ",binstr);
        k=16-k;
        for (j=i-k;j<i;j++) {
            sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
        }
        printf("%s\n",binstr);
    }
}

赵4老师 2016-03-22

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RegQueryValueEx The RegQueryValueEx function retrieves the type and data for a specified value name associated with an open registry key. LONG RegQueryValueEx( HKEY hKey, // handle to key to query LPTSTR lpValueName, // address of name of value to query LPDWORD lpReserved, // reserved LPDWORD lpType, // address of buffer for value type LPBYTE lpData, // address of data buffer LPDWORD lpcbData // address of data buffer size ); …… lpcbData Pointer to a variable that specifies the size, in bytes, of the buffer pointed to by the lpData parameter. When the function returns, this variable contains the size of the data copied to lpData. If the data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, then lpcbData will also include the size of the terminating null character. The lpcbData parameter can be NULL only if lpData is NULL. If the buffer specified by lpData parameter is not large enough to hold the data, the function returns the value ERROR_MORE_DATA, and stores the required buffer size, in bytes, into the variable pointed to by lpcbData. If lpData is NULL, and lpcbData is non-NULL, the function returns ERROR_SUCCESS, and stores the size of the data, in bytes, in the variable pointed to by lpcbData. This lets an application determine the best way to allocate a buffer for the value's data.

赵4老师 2016-03-22