Question

DLLENTRY int CCON mfScan (int, int, int, char *, int *);

[DllImport("mflib.dll")]
public static extern int mfScan(int mode, int font, int timeout, string ret_codeline, int ret_maxchars);

I get the below error with this code. It points to test. What can i do ?

 string test = string.Empty;
 int retval = mfScan(32, 2, 5000, test, 100);

www.un.org/Depts/DGACM/index_spanish.htm 试图读写受保护的记忆。这往往表明其他记忆是腐败的。

Answer 1

为此:

[DllImport("mflib.dll")]
public static extern int mfScan(int mode, int font, int timeout, StringBuilder ret_codeline, out int ret_maxchars);

Please note the StringBuilder instead of string, additionally to the out int ret_maxchars. Then ensure the calling convention is correct.

Answer 2

见out int ret_maxchars。

您还应考虑在<代码>上添加。