error: Implicit conversion of C pointer type...

I already use this version

Hi, how did you add lib and code in your project.Could paste the definition and function use code ,I'll help you check this problem

this is the screenshot of my project with the line error
www.dropbox.com/s/b7trugukepkoyo8/Scherm...0alle%2015.01.36.png

path is NSString not const char *.Try this.
-(int)PDFOpen:(NSString *)path : (NSString *)pwd
{

[self PDFClose];
PDF_ERR err = 0;
m_doc = [[PDFDoc alloc] init];
err = [m_doc open:path :pwd];

i already try it, i have this error
www.dropbox.com/s/lv9d2ic6aubxlom/Scherm...0alle%2015.16.57.png

Is m_doc define as PDFDoc？