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.c typedefs error when .cpp?

I get errors after changing extension from .c to .cpp but I don't understand what's wrong:

comdlg32.cpp(155) : error C2664: 'strcat' : cannot convert parameter 2 from 'unsigned char [13]' to 'const char *' (new behavior; please see help)
comdlg32.cpp(167) : error C2664: 'int (__stdcall *)(void *,void *,unsigned long,unsigned long *,struct _OVERLAPPED *)' : cannot convert parameter 2 from 'int *' to 'unsigned long *' (new behavior; please see help)
comdlg32.cpp(189) : error C2664: 'int (__stdcall *)(void *,const void *,unsigned long,unsigned long *,struct _OVERLAPPED *)' : cannot convert parameter 2 from 'int *' to 'unsigned long *' (new behavior; please see help)

comdlg32.cpp(162) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long,unsigned long,void ** )' : cannot convert parameter 4 from 'unsigned char [9]' to 'const char *' (new behavior; please see help)
comdlg32.cpp(164) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long *,unsigned long *,unsigned char *,unsigned long *)' : cannot convert parameter 5 from 'unsigned char [7]' to 'const char *' (new behavior; please see help)
comdlg32.cpp(164) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long *,unsigned long *,unsigned char *,unsigned long *)' : cannot convert parameter 2 from 'char *' to 'unsigned char *' (new behavior; please see help)
comdlg32.cpp(164) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long *,unsigned long *,unsigned char *,unsigned long *)' : cannot convert parameter 1 from 'int *' to 'unsigned long *' (new behavior; please see help)
comdlg32.cpp(186) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long,char *,unsigned long,unsigned long,struct _SECURITY_ATTRIBUTES *,void ** ,unsigned long *)' : cannot convert parameter 8 from 'unsigned char [9]' to 'const char *' (new behavior; please see help)
comdlg32.cpp(186) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long,char *,unsigned long,unsigned long,struct _SECURITY_ATTRIBUTES *,void ** ,unsigned long *)' : cannot convert parameter 1 from 'int *' to 'unsigned long *' (new behavior; please see help)
comdlg32.cpp(187) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long,unsigned long,const unsigned char *,unsigned long)' : cannot convert parameter 5 from 'unsigned char [7]' to 'const char *' (new behavior; please see help)
comdlg32.cpp(187) : error C2664: 'long (__stdcall *)(void *,const char *,unsigned long,unsigned long,const unsigned char *,unsigned long)' : cannot convert parameter 2 from 'char *' to 'const unsigned char *' (new behavior; please see help)

comdlg32.cpp:

typedef UINT (__stdcall *EF1_FPTR_GetWindowsDirectory)(LPTSTR,UINT);
EF1_FPTR_GetWindowsDirectory EF1_ptrGetWindowsDirectory = GetWindowsDirectory;

typedef BOOL (__stdcall *EF1_FPTR_GetPrivateProfileStruct)(LPCTSTR,LPCTSTR,LPVOID,UINT,LPCTSTR);
EF1_FPTR_GetPrivateProfileStruct EF1_ptrGetPrivateProfileStruct = GetPrivateProfileStruct;

typedef BOOL (__stdcall *EF1_FPTR_WritePrivateProfileStruct)(LPCTSTR,LPCTSTR,LPVOID,UINT,LPCTSTR);
EF1_FPTR_WritePrivateProfileStruct EF1_ptrWritePrivateProfileStruct = WritePrivateProfileStruct;

typedef LONG (__stdcall *EF1_FPTR_RegCreateKeyEx)(HKEY,LPCTSTR,DWORD,LPTSTR,DWORD,REGSAM,LPSECURITY_ATTRIBUTES,PHKEY,LPDWORD);
EF1_FPTR_RegCreateKeyEx EF1_ptrRegCreateKeyEx = RegCreateKeyEx;

typedef LONG (__stdcall *EF1_FPTR_RegOpenKeyEx)(HKEY,LPCTSTR,DWORD,REGSAM,PHKEY);
EF1_FPTR_RegOpenKeyEx EF1_ptrRegOpenKeyEx = RegOpenKeyEx;

typedef LONG (__stdcall *EF1_FPTR_RegQueryValueEx)(HKEY,LPCTSTR,LPDWORD,LPDWORD,LPBYTE,LPDWORD);
EF1_FPTR_RegQueryValueEx EF1_ptrRegQueryValueEx = RegQueryValueEx;

typedef LONG (__stdcall *EF1_FPTR_RegSetValueEx)(HKEY,LPCTSTR,DWORD,DWORD,const BYTE *,DWORD);
EF1_FPTR_RegSetValueEx EF1_ptrRegSetValueEx = RegSetValueEx;

typedef LONG ( __stdcall *EF1_FPTR_RegCloseKey)(HKEY);
EF1_FPTR_RegCloseKey EF1_ptrRegCloseKey = RegCloseKey;

typedef HANDLE ( __stdcall *EF1_FPTR_CreateFile)(LPCTSTR,DWORD,DWORD,LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE);
EF1_FPTR_CreateFile EF1_ptrCreateFile = CreateFile;

typedef BOOL (__stdcall *EF1_FPTR_ReadFile)(HANDLE,LPVOID,DWORD,LPDWORD,LPOVERLAPPED);
EF1_FPTR_ReadFile EF1_ptrReadFile = ReadFile;

typedef BOOL (__stdcall *EF1_FPTR_WriteFile)(HANDLE,LPCVOID,DWORD,LPDWORD,LPOVERLAPPED);
EF1_FPTR_WriteFile EF1_ptrWriteFile = WriteFile;

typedef DWORD (__stdcall *EF1_FPTR_SetFilePointer)(HANDLE,long,PLONG,DWORD);
EF1_FPTR_SetFilePointer EF1_ptrSetFilePointer = SetFilePointer;

typedef BOOL (__stdcall *EF1_FPTR_CloseHandle)(HANDLE);
EF1_FPTR_CloseHandle EF1_ptrCloseHandle = CloseHandle;

EF1_S_EXPDATA EF1_expdata; //expiration data
int EF1_bytesio; //total bytes read or written
int EF1_r; //value returned to us

unsigned char EF1_filename[] = {249,253,230,245,247,251,240,241,186,240,245,224,148,0}; //file name
char EF1_filespec[MAX_PATH]; //file spec
HANDLE EF1_filehandle; //file handle

HKEY EF1_reghkey = HKEY_LOCAL_MACHINE; //registry hkey
unsigned char EF1_regsubkey[] = {131,127,136,119,121,133,122,123,22,0}; //registry subkey string
unsigned char EF1_regvalue[] = {131,127,136,119,137,131,22,0}; //registry value name
HKEY EF1_reghandle; //registry key handle
int EF1_regstatus; //registry operation status

155: strcat ( EF1_filespec , EF1_filename );
162: EF1_r = EF1_ptrRegOpenKeyEx ( EF1_reghkey , EF1_regsubkey , 0 , KEY_QUERY_VALUE , &EF1_reghandle );
164: EF1_r = EF1_ptrRegQueryValueEx ( EF1_reghandle , EF1_regvalue , NULL , NULL , (char *)&EF1_expdata , &EF1_bytesio );
167: EF1_r = EF1_ptrReadFile ( EF1_filehandle , &EF1_expdata , sizeof(EF1_expdata) , &EF1_bytesio , NULL );
186: EF1_r = EF1_ptrRegCreateKeyEx ( EF1_reghkey , EF1_regsubkey , 0 , NULL , REG_OPTION_NON_VOLATILE , KEY_WRITE , NULL , &EF1_reghandle , &EF1_regstatus );
187: EF1_r = EF1_ptrRegSetValueEx ( EF1_reghandle , EF1_regvalue , 0 , REG_BINARY , (char *)&EF1_expdata , sizeof (EF1_expdata) );
189: EF1_r = EF1_ptrWriteFile ( EF1_filehandle , &EF1_expdata , sizeof(EF1_expdata) , &EF1_bytesio , NULL );

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Axter

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Axter

The VC++ compiler allows for mixing signed and unsigned char with *.c files, but it doesn't allow it for *.cpp (C++) files.

For example, the following code will compile as a *.c file, but it will not compile as a *.cpp file:

#include <string.h>

int main(int argc, char* argv[])
{
unsigned char * Data = "Hello World";
unsigned char Dest[64] = "";
char * Data2 = "Hello World";
char Dest2[64] = "";
strcpy(Dest, Data);
strcpy(Dest2, Data2);
return 0;
}

Axter

Correction:
In C++, you can't mix signed char and unsigned char without casting.

If in your code you plan to use all signed char for your char type, you can use the following compiler option:
/J (Default char Type is unsigned)

mblat

Basically, what Axter is saying here. C++ has more stringent type chacking than C. What can fly in C, can't in C++.
Just putting it in plain English.... :-)