D - imagemagick wrapper?
- Mårten Ask (3/3) Aug 12 2003 Hi,
- Mike Wynn (285/288) Aug 12 2003 here's a templated class lib I wrote to help with dll loading ('cos I li...
- Mårten Ask (25/79) Aug 15 2003 Thanks!
- Mike Wynn (43/136) Aug 15 2003 the compiler only needs to know about the struct layout, this is usually...
Hi, I want to use som functions from the imagemagick C api. How do I do that? How do I call the functions and objects and how do I link with the dll's?
Aug 12 2003
here's a templated class lib I wrote to help with dll loading ('cos I like
the delphi extern "foo.dll"; )
and an example (loads winmm.dll to all access to multimedia timers)
due to D's templateing its a little verbose, but works ...
first make instances of the types of functions you want to import
e.g. `extern (windows) DWORD func();`
instance DynFunc( Windows, DWORD ) noParamReturnsDword;
the declare a func pointer to it (using the template instance)
`<instance>.fp` e.g. ....
noParamReturnsDword.fp myFunc;
// now write a static initialiser to your module to load the dll and get the
function.
// there are two ways to do this both have the same result but its personal
preference which you use
static this()
{
// fp = <template>.require( <dll name>, <func_name> ); // I perfer this
myFunc = I_I_Ldr.require( "foo.dll", "someFuncname" );
// <template>.use( fp, <dll name>, <func_name> );
noParamReturnsDword.use( myFunc, "foo.dll", "someFuncname" );
}
for C fucntions use
instance DynFunc( C, <return_type>, <param1>, <param2> .... ) somename;
if the return type is void due to D templates you can't use
instance DynFunc( C, void, int );
instead you have to use DynProc( C, int );
or DyncProc( C ) => extern(C) void func( void );
to do it manually here the code that loads up and gets a directx d3d
interface from the function
`Direct3DCreate8` in `d3d8.dll`
extern(Windows) alias IDirect3D8 function( UINT ) start_up_fp;
IDirect3D8 loadD3DLibs() {
HMODULE sysModule;
sysModule = LoadLibraryA( "d3d8.dll" ); // load a dll
FARPROC fp = GetProcAddress( sysModule, cast(char*)"Direct3DCreate8" ); //
get a function pointer
assert(fp);
start_up_fp dxfp = cast(start_up_fp)fp;
return dxfp(D3D_SDK_VERSION);
}
failing all that .... use implib to convert the dll to a .lib and just write
the functions as
extern( C ) .....
or extern(Windows) .....
the linker will the link correctly against <foo>.dll if you link against the
created lib file.
"Mårten Ask" <majbritt37 hotmail.com> wrote in message
news:bhb9cs$1eq3$1 digitaldaemon.com...
Hi,
I want to use som functions from the imagemagick C api. How do I do that?
How do I call the functions and objects and how do I link with the dll's?
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end
begin 666 winmm.d
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`
end
Aug 12 2003
Thanks! I haven't had time to try it out yet.. There's still one thing that puzzles me though. Structs. how do I declare that I want a struct from the dll? From the imagemagick api: typedef struct _MagickWand MagickWand; ... extern MagickExport MagickWand *MagickCloneWand(const MagickWand *), *MagickCoalesceImages(MagickWand *), *NewMagickWand(void); ... Obviously I need to declare those functions as 'extern (C) MagickWand NewMagickWand()' but then the compiler complains about not knowing what a MagickWand is. Do I write 'extern (C) struct MagickWand'? Or 'extern (C) typedef MagickWand'? "Mike Wynn" <mike.wynn l8night.co.uk> skrev i meddelandet news:bhbaa0$1ftb$1 digitaldaemon.com...here's a templated class lib I wrote to help with dll loading ('cos I like the delphi extern "foo.dll"; ) and an example (loads winmm.dll to all access to multimedia timers) due to D's templateing its a little verbose, but works ... first make instances of the types of functions you want to import e.g. `extern (windows) DWORD func();` instance DynFunc( Windows, DWORD ) noParamReturnsDword; the declare a func pointer to it (using the template instance) `<instance>.fp` e.g. .... noParamReturnsDword.fp myFunc; // now write a static initialiser to your module to load the dll and getthefunction. // there are two ways to do this both have the same result but itspersonalpreference which you use static this() { // fp = <template>.require( <dll name>, <func_name> ); // I perfer this myFunc = I_I_Ldr.require( "foo.dll", "someFuncname" ); // <template>.use( fp, <dll name>, <func_name> ); noParamReturnsDword.use( myFunc, "foo.dll", "someFuncname" ); } for C fucntions use instance DynFunc( C, <return_type>, <param1>, <param2> .... ) somename; if the return type is void due to D templates you can't use instance DynFunc( C, void, int ); instead you have to use DynProc( C, int ); or DyncProc( C ) => extern(C) void func( void ); to do it manually here the code that loads up and gets a directx d3d interface from the function `Direct3DCreate8` in `d3d8.dll` extern(Windows) alias IDirect3D8 function( UINT ) start_up_fp; IDirect3D8 loadD3DLibs() { HMODULE sysModule; sysModule = LoadLibraryA( "d3d8.dll" ); // load a dll FARPROC fp = GetProcAddress( sysModule, cast(char*)"Direct3DCreate8" );//get a function pointer assert(fp); start_up_fp dxfp = cast(start_up_fp)fp; return dxfp(D3D_SDK_VERSION); } failing all that .... use implib to convert the dll to a .lib and justwritethe functions as extern( C ) ..... or extern(Windows) ..... the linker will the link correctly against <foo>.dll if you link againstthecreated lib file. "Mårten Ask" <majbritt37 hotmail.com> wrote in message news:bhb9cs$1eq3$1 digitaldaemon.com...that?Hi, I want to use som functions from the imagemagick C api. How do I dodll's?How do I call the functions and objects and how do I link with the
Aug 15 2003
"Mike Wynn" <mike.wynn l8night.co.uk> "Mårten Ask" <majbritt37 hotmail.com> wrote in message news:bhjaf3$348$1 digitaldaemon.com...Thanks! I haven't had time to try it out yet.. There's still one thing that puzzles me though. Structs. how do I declare that I want a struct from the dll? From the imagemagick api:the compiler only needs to know about the struct layout, this is usually in the c header some times you will find typedef struct _foo { } * ApiToken; either way the dll does not "export" the struct layout. if the dll contains a struct then I assume its struct foo { int a; } extern (C) foo in_dll; I've only every used "getProcAddress" or implicit linking I'm not sure what VC++/Windows does with dll's contain data too, guess I better read some docs might be useful!! read on about how to declare the struct;typedef struct _MagickWand MagickWand; ... extern MagickExport MagickWand *MagickCloneWand(const MagickWand *), *MagickCoalesceImages(MagickWand *), *NewMagickWand(void);you need to know what the _MagicWand struct looks like .. also note the use of align. struct Foo { align(1): byte a, b; int missaligned; }; struct Foo2 { align(4): byte a, b; int aligned; align(1): byte c; int offby1; }; (the default for D and C is to align items at their size (works on CISC and RISC then)) only the functions need to be extern(C) etc extern(C) : Foo * getFooFromFoo2( Foo2* ); Foo* getContext(); etc... asfaik (Walter correct me here if I'm wrong) the only time making a struct, alias or typedef as extern(CONV) is if it contains a pointer to func that you want to have that calling convention. although is does help document the code to have extern(C) struct MyStruct { align(4): int a, b, c, d; } (implies that its for use with extern(C) funcs).... Obviously I need to declare those functions as 'extern (C) MagickWand NewMagickWand()' but then the compiler complains about not knowing what a MagickWand is. Do I write 'extern (C) struct MagickWand'? Or 'extern (C) typedef MagickWand'? "Mike Wynn" <mike.wynn l8night.co.uk> skrev i meddelandet news:bhbaa0$1ftb$1 digitaldaemon.com...likehere's a templated class lib I wrote to help with dll loading ('cos Ithe delphi extern "foo.dll"; ) and an example (loads winmm.dll to all access to multimedia timers) due to D's templateing its a little verbose, but works ... first make instances of the types of functions you want to import e.g. `extern (windows) DWORD func();` instance DynFunc( Windows, DWORD ) noParamReturnsDword; the declare a func pointer to it (using the template instance) `<instance>.fp` e.g. .... noParamReturnsDword.fp myFunc; // now write a static initialiser to your module to load the dll and getthefunction. // there are two ways to do this both have the same result but itspersonalpreference which you use static this() { // fp = <template>.require( <dll name>, <func_name> ); // I perfer this myFunc = I_I_Ldr.require( "foo.dll", "someFuncname" ); // <template>.use( fp, <dll name>, <func_name> ); noParamReturnsDword.use( myFunc, "foo.dll", "someFuncname" ); } for C fucntions use instance DynFunc( C, <return_type>, <param1>, <param2> .... ) somename; if the return type is void due to D templates you can't use instance DynFunc( C, void, int ); instead you have to use DynProc( C, int ); or DyncProc( C ) => extern(C) void func( void ); to do it manually here the code that loads up and gets a directx d3d interface from the function `Direct3DCreate8` in `d3d8.dll` extern(Windows) alias IDirect3D8 function( UINT ) start_up_fp; IDirect3D8 loadD3DLibs() { HMODULE sysModule; sysModule = LoadLibraryA( "d3d8.dll" ); // load a dll FARPROC fp = GetProcAddress( sysModule, cast(char*)"Direct3DCreate8" );//get a function pointer assert(fp); start_up_fp dxfp = cast(start_up_fp)fp; return dxfp(D3D_SDK_VERSION); } failing all that .... use implib to convert the dll to a .lib and justwritethe functions as extern( C ) ..... or extern(Windows) ..... the linker will the link correctly against <foo>.dll if you link againstthecreated lib file. "Mårten Ask" <majbritt37 hotmail.com> wrote in message news:bhb9cs$1eq3$1 digitaldaemon.com...that?Hi, I want to use som functions from the imagemagick C api. How do I dodll's?How do I call the functions and objects and how do I link with the
Aug 15 2003