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[C++] loading img
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Stylo
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PostPosted: Thu Jan 22, 2009 9:34 am    Post subject: [C++] loading img Reply with quote
how would i load an image to my form in c++?
i know that in C# there's a picture control, but C# != C++ so :\
if some1 can explain me here or link to any good tutorial i'd be grateful
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kitterz
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PostPosted: Thu Jan 22, 2009 9:35 am    Post subject: Re: [C++] loading img Reply with quote
1qaz wrote:
how would i load an image to my form in c++?
i know that in C# there's a picture control, but C# != C++ so :\
if some1 can explain me here or link to any good tutorial i'd be grateful


err add the photo as a resource, and draw it onpaint....though its not the best way...

Edit: There just might be a picture control, but its in MFC

http://www.functionx.com/visualc/applications/displaybitmap.htm
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Stylo
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PostPosted: Thu Jan 22, 2009 9:38 am    Post subject: Reply with quote
like i said i have no experience at this whole process in C++
and i can't get what you're saying so if you could point me to some good tut?

@to your edit: MFC can't help me i never learned it :\ thx anyway
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lurc
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PostPosted: Thu Jan 22, 2009 9:59 am    Post subject: Reply with quote
Well if you want to just make a static control with the style SS_BITMAP then sending the message STM_SETIMAGE. You can load the image using LoadImage. If you don't want to add it from resource you can use the LR_LOADFROMFILE flag.
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Stylo
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PostPosted: Thu Jan 22, 2009 10:36 am    Post subject: Reply with quote
lemme see if i got you straight
i defined a new control (but i wasn't sure about the class name so i put WC_BUTTON)
Code:

btmp = CreateWindowEx(0,WC_BUTTON,0,SS_BITMAP | WS_CHILD | WS_VISIBLE,15,15,200,200,hWnd,(HMENU)BITTT,GetModuleHandle(0),0);

then loaded an image using LoadImage to get the handle to the picture?
Code:

hPic = LoadImage(m_hInstance,"aaa.bmp",IMAGE_BITMAP,155,150,LR_LOADFROMFILE);

and then sent a message to the control to set the image to it
Code:

SendMessage(btmp,STM_SETIMAGE,(WPARAM)IMAGE_BITMAP,(LPARAM)hPic);

and all i get is an empty checkbox square that does nothing Surprised
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lurc
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PostPosted: Thu Jan 22, 2009 10:51 am    Post subject: Reply with quote
Class is WC_STATIC. And you don't even have to store the variable. You can just call it in LPARAM and cast it.
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hcavolsdsadgadsg
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PostPosted: Thu Jan 22, 2009 10:56 am    Post subject: Reply with quote
you can always just do this.

1. Get a handle to whatever you want to draw on. GetDC()
2. Create an offscreen buffer. CreateCompatibleDC()
3. Get a handle to your bitmap. LoadImage()
4. Select the bitmap into your memory DC. SelectObject()
5. Blit that shit. BitBlt()

easy as pie.
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Stylo
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PostPosted: Thu Jan 22, 2009 11:00 am    Post subject: Reply with quote
slovach wrote:
you can always just do this.

1. Get a handle to whatever you want to draw on. GetDC()
2. Create an offscreen buffer. CreateCompatibleDC()
3. Get a handle to your bitmap. LoadImage()
4. Select the bitmap into your memory DC. SelectObject()
5. Blit that shit. BitBlt()

easy as pie.

how would i get a handle to the DC of my bitmap file?
@lurc
it failed again i guess the return value of LoadImage is NULL that's why it fail is something wrong with those parameters?
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hcavolsdsadgadsg
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PostPosted: Thu Jan 22, 2009 11:13 am    Post subject: Reply with quote
1qaz wrote:
slovach wrote:
you can always just do this.

1. Get a handle to whatever you want to draw on. GetDC()
2. Create an offscreen buffer. CreateCompatibleDC()
3. Get a handle to your bitmap. LoadImage()
4. Select the bitmap into your memory DC. SelectObject()
5. Blit that shit. BitBlt()

easy as pie.

how would i get a handle to the DC of my bitmap file?
@lurc
it failed again i guess the return value of LoadImage is NULL that's why it fail is something wrong with those parameters?


I should have said GetDC gets a handle to the DC of the window area.
LoadImage returns a handle of the loaded image.

if LoadImage is returning NULL, call GetLastError, and see what it has to say.
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Stylo
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PostPosted: Thu Jan 22, 2009 12:09 pm    Post subject: Reply with quote
yea i thought about getlaserror but one other thing XD
how would i convert dword value to string so i'd present the error at messagebox?
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FerrisBuellerYourMyHero
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PostPosted: Thu Jan 22, 2009 12:35 pm    Post subject: Reply with quote
Ok I've known how to draw bitmaps, but they can be quite big. And it sucks including them embedded in your app, since it makes it larger.

How can you load a compressed image? such as PNG?

I imagine you have to decompress it and make it into a bitmap in memory. Probably something like that, but I could never figure it out...

Anyone know how to load a PNG image? If your using DirectX it will draw PNG images, so you don't even need to worry about decompressing it or anything, its all handled for you.

But if your not using DirectX, what do you use?

Anyway 1qaz, I made you an example application. The project was made in MSVC++ 2008, but the method will still work in whatever compiler you use...

It shows how to load a bitmap and draw it on your application (with the bitmap being in the same folder as your exe)

And also how to embed it as a resource, then load it from the resource and draw it that way...

Its not a bad way to do it, if your bitmap image is small, but for larger images it would be nice to be able to load PNG Wink

The code is like this:

Code:

hImage = ez.image(hwnd, 1, 1, 200); //hwnd, x, y, id

   //Loading bitmap from file in the same folder method
   //hBitmap = LoadImageA(0, "GGkilla.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

   //Loading bitmap from resource method
   hBitmap = LoadImageW(hInstance, MAKEINTRESOURCE(102), IMAGE_BITMAP, 0, 0, 0);

   SendMessage(hImage, STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hBitmap);



ez.image just calls CreateWindowEx like this:

Code:

return CreateWindowExA(0, "STATIC", 0, WS_CHILD | WS_VISIBLE | SS_BITMAP, x, y, 0, 0, h, (HMENU)id, hInst, 0);


width and height don't matter, since your image width and height is what it will show once you set the image...

for the resource way, I just manually make a rsrc.rc and resource.h...

rsrc.rc
Code:

#include "resource.h"

IDI_BITMAP   BITMAP   "GGkilla.bmp"


resource.h
Code:

#define IDI_BITMAP         102


note: when your doing the resource way the image has to be in the same folder as where your source files are, for MSVC++ thats ProjectName\ProjectName

Wink

1qaz wrote:
yea i thought about getlaserror but one other thing XD
how would i convert dword value to string so i'd present the error at messagebox?


Code:


char* dbg = new char[260];

sprintf(dbg, "dword value = %u", dwordvalue);
MessageBoxA(0, dbg, "DWORD VALUE:", 0);

delete[] dbg;



the %u should be different depending on how you want to display the value, %u is unsigned integer, %i is signed integer, %X or %x for hex, etc... look up sprintf for more help...

The Extension 'zip' was deactivated by an board admin, therefore this Attachment is not displayed.

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Stylo
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PostPosted: Thu Jan 22, 2009 12:48 pm    Post subject: Reply with quote
wow looks grate thx a lot
i'll take a closer look at it tomorrow i gtg to sleep really tired |-]
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crayzbeef
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PostPosted: Thu Jan 22, 2009 4:38 pm    Post subject: Reply with quote
Or just use a library like SDL to load images. Much easier and faster.
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hcavolsdsadgadsg
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PostPosted: Thu Jan 22, 2009 9:52 pm    Post subject: Reply with quote
Code:

#include <Windows.h>

int main(){
   BITMAP bm   = { 0 };

   HDC hdc      = GetDC(NULL);
   HDC   hdcMem   = CreateCompatibleDC(hdc);
   HANDLE hbm   = LoadImage(NULL, "C:\\Users\\Fake\\Desktop\\New Bitmap Image.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

   SelectObject(hdcMem, (HGDIOBJ)hbm);
   GetObject(hbm, sizeof(bm), &bm);

   for(;;){
      BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
      Sleep(10);
   }

//fuck cleaning up resources, way too lazy right now.

   return 0;
}


GDI is rad.
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HomerSexual
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PostPosted: Fri Jan 23, 2009 5:58 am    Post subject: Reply with quote
crayzbeef wrote:
Or just use a library like SDL to load images. Much easier and faster.


why would you load a whole library like SDL just for loading an image when you can do the same thing faster using win32? I dont get it, is it just easier? I dont see anyway it could be faster if you are using a raw method.

sure, it's great for portable games and direct graphics, but isn't it slightly overkill for just loading an image?
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