Found the answer myself:
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When I using the followin code:
#import "wininet.dll"
int InternetOpenA(string a0, int a1, string a2, string a3, int a4);#import
The call of InternetOpenA is like:
int abc= InternetOpenA("abcde", 0, "0", "0",268);
It reports that dll calls are not allowed; "wininet.dll' - "InternetOpenA"
I don't know why. Anybody help me with this, please.