VC中一些保存,读取应用程序数据的方式

经验总结

VC中一些常用的保存,读取应用程序数据的方式:

1.写入系统分配ini文件(适合少量数据的存取)

存:

  WriteProfileInt 

  Call this member function to write the specified value into the specified section of the application's registry or .INI file.

  WriteProfileString

  The WriteProfileString function copies a string into the specified section of the Win.ini file. If Win.ini uses Unicode characters, the function writes Unicode characters to the file. Otherwise, the function writes ANSI characters.

取:

  相应的get函数

  

2.写入自定义.ini文件(适合应用程序的初始化参数设置)

存

  WritePrivateProfileString

  The WritePrivateProfileString function copies a string into the specified section of an initialization file.

取

  GetPrivateProfileString

  The GetPrivateProfileString function retrieves a string from the specified section in an initialization file.

  The following sample code illustrates the preceding guidelines and is based on several assumptions:

 举例:

 There is an application named App Name. 

That application uses an .ini file named AppName.ini. 

There is a section in the .ini file that we want to look like this:

[Section1] 

  FirstKey = It all worked out okay. 

  SecondKey = By golly, it works. 

  ThirdKey = Another test.

The user will not have to reboot the system in order to have future invocations of the application see the mapping of the .ini file to the registry.

#include <stdio.h> 

#include <windows.h> 

 

int main() 

{ 

   CHAR   inBuf[80]; 

   HKEY   hKey1, hKey2; 

   DWORD  dwDisposition; 

   LONG   lRetCode; 

   CHAR   szData[] = "USR:App Name//Section1";

 

   // Create the .ini file key. 

   lRetCode = RegCreateKeyEx ( HKEY_LOCAL_MACHINE, 

       "SOFTWARE//Microsoft//Windows NT//CurrentVersion//IniFileMapping//appname.ini", 

       0, 

       NULL, 

       REG_OPTION_NON_VOLATILE, 

       KEY_WRITE, 

       NULL, 

       &hKey1, 

       &dwDisposition); 

 

   if (lRetCode != ERROR_SUCCESS)

   { 

      printf ("Error in creating appname.ini key/n"); 

      return (0) ; 

   } 

 

   // Set a section value 

   lRetCode = RegSetValueEx ( hKey1, 

                              "Section1", 

                              0, 

                              REG_SZ, 

                              szData, 

                              sizeof(szData)); 

 

   if (lRetCode != ERROR_SUCCESS) 

   { 

      printf ("Error in setting Section1 value/n"); 

      // Close the key

      lRetCode = RegCloseKey( hKey1 );

      if( lRetCode != ERROR_SUCCESS )

      {

         printf("Error in RegCloseKey/n");

         return (0) ; 

      }

   } 

 

   // Create an App Name key 

   lRetCode = RegCreateKeyEx ( HKEY_CURRENT_USER, 

                               "App Name", 

                               0, 

                               NULL, 

                               REG_OPTION_NON_VOLATILE,

                               KEY_WRITE, 

                               NULL, 

                               &hKey2, 

                               &dwDisposition); 

 

   if (lRetCode != ERROR_SUCCESS) 

   { 

      printf ("Error in creating App Name key/n");

      // Close the key

      lRetCode = RegCloseKey( hKey2 );

      if( lRetCode != ERROR_SUCCESS )

      {

         printf("Error in RegCloseKey/n");

         return (0) ; 

      }

   } 

 

   // Force the system to read the mapping into shared memory 

   // so that future invocations of the application will see it 

   // without the user having to reboot the system 

   WritePrivateProfileStringW( NULL, NULL, NULL, L"appname.ini" ); 

 

   // Write some added values 

   WritePrivateProfileString ("Section1", 

                              "FirstKey", 

                              "It all worked out OK.", 

                              "appname.ini"); 

   WritePrivateProfileString ("Section1", 

                              "SecondKey", 

                              "By golly, it works!", 

                              "appname.ini"); 

   WritePrivateProfileString ("Section1", 

                              "ThirdKey", 

                              "Another test...", 

                              "appname.ini");

   // Test 

   GetPrivateProfileString ("Section1", 

                            "FirstKey", 

                            "Error: GPPS failed", 

                            inBuf, 

                            80, 

                            "appname.ini"); 

   printf ("%s", inBuf); 

 

   // Close the keys

   lRetCode = RegCloseKey( hKey1 );

   if( lRetCode != ERROR_SUCCESS )

   {

      printf("Error in RegCloseKey/n");

      return(0);

   }

   lRetCode = RegCloseKey( hKey2 );

   if( lRetCode != ERROR_SUCCESS )

   {

      printf("Error in RegCloseKey/n");

      return(0);

   }

   

   return(1); 

}

3.注册表内存取(适合一些固定数据参数的读写)

存:

DWORD SetRegistry(char *szRegPort, char *szKey, char *szValue)

{

    char    ValueName[128];

    HKEY    hkPort;

    DWORD    cbData = 256;

    DWORD    retCode, dwDisp;

    if ((retCode=RegCreateKeyEx(HKEY_LOCAL_MACHINE, szRegPort, 0, NULL, REG_OPTION_NON_VOLATILE,

                                KEY_ALL_ACCESS, NULL, &hkPort, &dwDisp)) == ERROR_SUCCESS)

    {

        lstrcpy(ValueName, szKey);

        retCode = RegSetValueEx(hkPort,                    // Key handle returned from RegOpenKeyEx.

                                ValueName,                // Name of value.

                                0,                        //reserved , must be null

                                REG_SZ,                    // Type of data.

                                (PBYTE)szValue,            // Data buffer.

                                strlen(szValue));        // Size of data buffer.

        RegCloseKey(hkPort);

    }

    return retCode;

}

取:

DWORD QueryRegistry(char *szRegPort, char *szKey, char *szValue)

{

    char    ValueName[128];

    HKEY    hkPort;

    BYTE    bData[256];  // in registry the max length is banner user name

    DWORD    cbData = 256;

    DWORD    retCode;

    DWORD    dwType=REG_SZ;

    if ((retCode = RegOpenKeyEx(HKEY_LOCAL_MACHINE, szRegPort, 0, KEY_EXECUTE, &hkPort)) == ERROR_SUCCESS)

    {

        lstrcpy(ValueName, szKey);

        retCode = RegQueryValueEx (hkPort,                // Key handle returned from RegOpenKeyEx.

                                ValueName,                // Name of value.

                                NULL,                    //reserved , must be null

                                &dwType,                // Type of data.

                                bData,                    // Data buffer.

                                &cbData);                // Size of data buffer.

        if (retCode == ERROR_SUCCESS)

        {

            strcpy(szValue,(const char*)bData);

        }

        RegCloseKey(hkPort);

    }

    return retCode;

}

4.自定义格式的文件(适合大量数据存取,不一定有规律)

  主要是CFile,FILE的操作

    

5.数据库的存取(适合大量有组织的数据)