如何检查INNOSETUP中的注册表值 [英] How to check the registry value in INNOSETUP

问题描述

Root：HKLM;子键：SOFTWARE\xxx\yyy; ValueType：string; ValueName：KEYNAME; ValueData：{olddata}; C：\ x\y\z.dll



我在inno设置中使用这行代码来打开注册表路径并在现有数据的enf处添加a.dll。如何检查注册表值是否具有我想要添加的dll名称。



我尝试了什么：



i尝试使用if和comparetext的组合但没有成功

Root: HKLM; Subkey: "SOFTWARE\xxx\yyy"; ValueType: string ; ValueName: "KEYNAME"; ValueData: "{olddata};C:\x\y\z.dll

I am using this line of code in inno setup to open the registry path and add a.dll at the enf of the existing data. How to check if the registry value has the dll name which i want to add.

What I have tried:

i have tried using the combination of if and comparetext but didn't succeed

推荐答案

如果要检查密钥是否存在并读取当前值，则必须使用 Pascal Scripting [ ^ ]在 [Code] [ ^ ]部分。但是，这个请求您熟悉Inno Setup使用的Pascal脚本。



从注册表中读取字符串值的函数是RegQueryStringValue [ ^ ]。然后，您可以使用 Pos 字符串函数来检查该值是否包含特定子字符串或使用 CompareText / CompareStr 比较完整的字符串。



未经测试的例子：

If you want to check if the key exists and read the current value, you must use Pascal Scripting[^] in the [Code][^] section. However, this requires that you become familiar with the Pascal scripting used by Inno Setup.

The function to read a string value from the registry is RegQueryStringValue[^]. You can then for example use the Pos string function to check if the value contains a specific substring or use CompareText / CompareStr to compare complete strings.

Untested example:

var
  Value, LowerValue: String;
  Search: Integer;
begin
  if RegQueryStringValue(HKEY_LOCAL_MACHINE, 'SOFTWARE\xxx\yyy', 'KEYNAME', Value) then
  begin
    LowerValue := Lowercase(Value);
    Search := Pos('c:\x\y\z.dll', LowerValue);
    if (Search = 0) then
    begin
       Value := Value + ';C:\x\y\z.dll';
       RegWriteStringValue(HKEY_LOCAL_MACHINE, 'SOFTWARE\xxx\yyy', 'KEYNAME', Value);
    end;
  else
    RegWriteStringValue(HKEY_LOCAL_MACHINE, 'SOFTWARE\xxx\yyy', 'KEYNAME', 'C:\x\y\z.dll');
  end;
end;

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