Reads a tagged string value written by WriteString from the reader object's stream and returns its contents.
function ReadString: string;
__fastcall AnsiString ReadString();
ReadString is a helper method used by other reader methods to read a string at the current reader Position. ReadString first checks the value type (TValueType) by calling the ReadValue method. If the item is a vaString or a vaLString type ReadString calls Read and returns the string. Otherwise it raises an EReadError exception.
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