help please save value

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hello

please anyone can give me the code mq4 for how i and save value in register and read it

thank you before

 
Topics concerning MT4 and MQL4 have their own section.
In future please post in the correct section.
I have moved your topic to the MQL4 and Metatrader 4 section.

 

What do you mean by “in register”?
     How To Ask Questions The Smart Way. 2004
          Be precise and informative about your problem

 
William Roeder:

What do you mean by “in register”?
     How To Ask Questions The Smart Way. 2004
          Be precise and informative about your problem

thank you for reply i mean regitry keys like same Registry ("HKEY_CURRENT_USER\Software\
 
maria:
thank you for reply i mean regitry keys like same Registry ("HKEY_CURRENT_USER\Software\


to read a "string" from registry key: (replace w/ your registry/key names at below codes)

#import "Advapi32.dll"
int RegOpenKeyExW(uint,string,int,int,int&);
int RegQueryValueExW(uint,string,int,int&,uchar&[],int&);
int RegSetValueExW(uint,string,int,int,string,int);
int RegCloseKey(int);
#import

uchar rgValue[1024];
int KEY_QUERY_VALUE=0x0001,ERROR_SUCCESS=0,hKey=0;
uint HKEY_CURRENT_USER=0x80000001;
string subKey="SOFTWARE\\QtProject\\OrganizationDefaults\\FileDialog";
int res=RegOpenKeyExW(HKEY_CURRENT_USER,subKey,0,KEY_QUERY_VALUE,hKey);
if(res==ERROR_SUCCESS)
 {
  int sz=1024,type=0;
  RegQueryValueExW(hKey,"lastVisited",0,type,rgValue,sz);
  RegCloseKey(hKey);
  ushort usArr[];//convert uchar to ushort-based unicode array
  ArrayResize(usArr,ArraySize(rgValue)/2);
  for(int ii=0; ii<ArraySize(rgValue); ii+=2)
   {
    if(ii!=ArraySize(rgValue)-1)
      usArr[ii/2]=rgValue[ii]+16*rgValue[ii+1];
   }
  string rgStr=ShortArrayToString(usArr);
  Print("string read from registry: ",rgStr);
 }


to write a "string" to registry key: (replace w/ your registry/key names at below codes)

#import "Advapi32.dll"
int RegOpenKeyExW(uint,string,int,int,int&);
int RegQueryValueExW(uint,string,int,int&,uchar&[],int&);
int RegSetValueExW(uint,string,int,int,string,int);
int RegCloseKey(int);
#import

int KEY_SET_VALUE=0x0002,ERROR_SUCCESS=0,hKey=0;
uint HKEY_CURRENT_USER=0x80000001;
string subKey="SOFTWARE\\QtProject\\OrganizationDefaults\\FileDialog";
int res=RegOpenKeyExW(HKEY_CURRENT_USER,subKey,0,KEY_SET_VALUE,hKey);
if(res==ERROR_SUCCESS)
{
 int REG_SZ=1;
 string wrStr="file:///D:/";
 RegSetValueExW(hKey,"lastVisited",0,REG_SZ,wrStr,StringLen(wrStr)*2);
 RegCloseKey(hKey);
 Print("string saved to registry: ",wrStr);
}


please kindly note above codes are ONLY tested and validated at mt4 - ie 32-bit app. 


if you want to port over mt5, ie 64-bit app, above win32 api calls might need to watch out certain "int vs long" migration.

 
Tsungche Kuo:


to read a "string" from registry key: (replace w/ your registry/key names at below codes)


to write a "string" to registry key: (replace w/ your registry/key names at below codes)


please kindly note above codes are ONLY tested and validated at mt4 - ie 32-bit app. 


if you want to port over mt5, ie 64-bit app, above win32 api calls might need to watch out certain "int vs long" migration.

thank you very mach
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