C# compile errors in unsafe code

Question

Compiling a VS 2010 c# project (.NET 4.0, any CPU, allow unsafe code = checked) we are getting a variety of compile errors as below:

Operator '*' cannot be applied to operands of type 'System.IntPtr' and 'int'
Constant value '325486741' cannot be converted to a 'int' (use 'unchecked' syntax to override)
Cannot convert type 'string' to 'char*'
Cannot implicitly convert type 'long' to 'byte*'. An explicit conversion exists (are you missing a cast?)
Invalid expression term 'ref'

All these are occurring in 'unsafe' methods.

How to resolve these ?

user541686 · Accepted Answer · 2010-12-15 07:49:16Z

2

We'd need to see your code, but I'd say that the "unsafe" part is irrelevant to the errors, since those seem to be problems with casting and such.

Here's some info that might help:

Try casting to an int or long first.

Constant value '325486741' cannot be converted to a 'int' (use 'unchecked' syntax to override)

Try using unchecked((int)variable).

Try using:

 fixed (char* pChar = my_string) { ... }

Cannot implicitly convert type 'long' to 'byte*'. An explicit conversion exists (are you missing a cast?)

Try casting: byte* pB = (byte*)value;

I can't say much about this one without the code.

answered Dec 15, 2010 at 7:49

user541686

213k133 gold badges564 silver badges935 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

it was using fixed (char* mystr = ((char*) mydata)). removing (char*) made this error go atleast. thnx.

Constant value '-1' cannot be converted to a 'uint' (use 'unchecked' syntax to override) ((uint) (-1)) >> ((10 - i) << 5)

Invalid expression ')' for int i = ((ref int) myPtr) myPtr is of type byte*

What about : Operator '+' cannot be applied to operands of type 'byte*' and 'byte*'

Well, you can't add two byte* s... what was your intention?

|