MT4/MQ4: Test if string blank

[[Deleted]]

How can I test of a string is blank?

For example:

if( !empty(MyString) ) {
 Alert("This string is not blank."); 
} 

[phi nuts]

hknight:

How can I test of a string is blank?

For example:

if( !empty(MyString) ) {
 Alert("This string is not blank."); 
} 

 

if (MyString == "")  Alert("This string is blank."); 

[William Roeder]

string NULLstring; // An un-initialized use will result in a error

string EmptyString = "";  // a zero length string

string BlankString = " "; // a one character string containing a single blank.

if (MyString == "")  Alert("This string is blank empty."); 

[Brian Branch]

string EmptyString;

// Returns true
EmptyString == NULL;