THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED
On 23/05/2003 at 02:28, xxxxxxxx wrote:
Yes, this is a problem with all global memory allocations. The runtime allocates global objects before the C4DOS connection has been initialized.
This isn't official advice yet, but what I did in one of my own plugins that needed global objects was to modify the internal glue of the API in c4d_pmain.cpp.
You have to modify pmain.cpp like this:
// this is the "glue" to C4D...
// please modify only if you know exactly what you are doing...
#ifdef WIN32
#include <windows.h>
#endif
#include "c4d_plugin.h"
#ifdef __MAC
#ifdef __cplusplus
extern "C" {
#endif
extern void __sinit(void);
extern void __destroy_global_chain(void);
#define C4D_MAIN LONG c4d_main(LONG action, void* p1, void* p2, void* p3)
C4D_MAIN;
#ifdef __cplusplus
}
#endif
#else
#ifdef __PC
#ifdef __cplusplus
extern "C" {
#endif
#define C4D_MAIN LONG __declspec(dllexport) c4d_main(LONG action, void* p1, void* p2, void* p3)
C4D_MAIN;
/*BOOL APIENTRY DllMain(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)
{
<remove>
}*/
extern BOOL APIENTRY _CRT_INIT(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
static HINSTANCE g_hinstDLL;
static LPVOID g_lpReserved;
BOOL APIENTRY DllMainCRTStartup( HINSTANCE hinst, DWORD reason, LPVOID reserved )
{
g_hinstDLL = hinst;
g_lpReserved = reserved;
return TRUE;
}
#ifdef __cplusplus
}
#endif
#else
#error "Unsupported OS"
#endif
#endif
LONG InitOS(void *p);
CHAR path_storage[1024];
C4D_MAIN //(LONG action, void* p1, void* p2, void* p3)
{
static LONG init_count = 0;
LONG i;
CHAR *c;
switch (action)
{
case C4DPL_INIT_VERSION:
return C4DPL_VERSION;
case C4DPL_INIT_SYS:
init_count += 1;
if (init_count == 1)
{
if (InitOS(p1) < 7500) return C4DPL_ERROR_VERSION;
#ifdef __PC
_CRT_INIT(g_hinstDLL, DLL_PROCESS_ATTACH, g_lpReserved);
#endif
#ifdef __MAC
__sinit();
#endif
if (!p3) return C4DPL_ERROR_VERSION;
for (i = 0, c = (CHAR* )p3; c[i]; i++) path_storage[i] = c[i];
path_storage[i] = 0;
}
return 1;
case C4DPL_MESSAGE:
if (!PluginMessage((LONG)p1,p2)) return C4DPL_ERROR;
return 1;
case C4DPL_INIT:
return PluginStart();
case C4DPL_END:
init_count -= 1;
if (init_count == 0)
{
PluginEnd();
void FreeResource();
FreeResource();
#ifdef __PC
_CRT_INIT(g_hinstDLL, DLL_PROCESS_DETACH, g_lpReserved);
#endif
#ifdef __MAC
__destroy_global_chain();
#endif
}
return 1;
default:
break;
}
return C4DPL_ERROR;
}
One also must add /ENTRY:DllMainCRTStartup to the linker options to make it link.
This way you defer the call to _CRT_INIT(), which allocates all globals, until after the C4DPL_INIT_SYS message.
Note: I have used and tested this myself, but there's no guarantee that it is 100 % safe, or that it will work with future versions. I'll remind the programmers to look into this again so that the above can perhaps be incorporated into official future versions.
Afaik it only affects PC though, since the Mac part already has its _sinit() where I added _CRT_INIT() above. So that is yes, with the mod you're safe on both Mac and PC.