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2026-06-18

读取数据库配置项 - GetDbConfig ​

函数简介 ​

读取自定义的配置项。

接口名称 ​

GetDbConfig

DLL调用 ​

cpp
long GetDbConfig(long ola, long db, string key);

参数说明 ​

参数名类型说明
ola长整数型OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
db长整数型数据库对象指针，由 OpenDatabase 接口返回。
key字符串配置项名，如"width"、"height"。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
std::string result = ola.GetDbConfig(0, "width");
csharp
using OLAPlug;

var ola = new OLAPlugServer();
string result = ola.GetDbConfig(0, "width");
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
result = ola.GetDbConfig(0, "width")
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
String result = ola.GetDbConfig(0, "width");
cpp
var ola = com("OlaPlug.OlaSoft")
var result = ola.GetDbConfig(0, "width")
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
result = ola.GetDbConfig(0, "width")
text
.局部变量 ola, OLAPlug
ola.创建 ()
result ＝ ola.GetDbConfig(0, “width”)
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var result = ola.GetDbConfig(0, "width");
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
文本型 result = ola.GetDbConfig(0, "width")
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
std::string result = ola.GetDbConfig(0, "width");

原生 DLL 调用 ​

cpp
long instance = CreateCOLAPlugInterFace();
long ptr = GetDbConfig(instance, 0, "width");
if (ptr != 0) {
    char buffer[512] = {0};
    GetStringFromPtr(ptr, buffer, sizeof(buffer));
    FreeStringPtr(ptr);
}
csharp
using System.Runtime.InteropServices;
using System.Text;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long CreateCOLAPlugInterFace();
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int GetStringFromPtr(long ptr, StringBuilder lpString, int size);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int FreeStringPtr(long ptr);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern int GetStringSize(long ptr);
[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long GetDbConfig(long ola, long db, string key);

long instance = CreateCOLAPlugInterFace();
long ptr = GetDbConfig(instance, 0, "width");
if (ptr != 0) {
    StringBuilder sb = new StringBuilder(GetStringSize(ptr) + 1);
    GetStringFromPtr(ptr, sb, sb.Capacity);
    FreeStringPtr(ptr);
    string result = sb.ToString();
}
python
from ctypes import CDLL, c_int, c_int64, create_string_buffer

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
instance = ola.CreateCOLAPlugInterFace()
ptr = ola.GetDbConfig(instance, 0, "width")
if ptr:
    buf = create_string_buffer(512)
    ola.GetStringFromPtr(ptr, buf, 512)
    ola.FreeStringPtr(ptr)
    result = buf.value.decode("utf-8")

返回值 ​

返回值说明
（返回值）字符串指针：对应配置项的值。DLL调用返回字符串指针地址，需要调用 FreeStringPtr 接口释放内存。

注意事项 ​

项目说明
该函数用于读取用户自定义数据该函数用于读取用户自定义数据，如账号密码、软件默认配置等信息。