GetObjectType function

If the function succeeds, the return value indicates the object type. The possible values are:

#define OBJ_PEN                1
#define OBJ_BRUSH              2
#define OBJ_DC                 3
#define OBJ_METADC             4
#define OBJ_METAFILE           5
#define OBJ_PAL                6
#define OBJ_FONT               7
#define OBJ_BITMAP             8
#define OBJ_REGION             9
#define OBJ_METAFILEPICT      10
#define OBJ_TEXT              11
#define OBJ_SPARE0            12
#define OBJ_SPARE1            13
#define OBJ_SPARE2            14
#define OBJ_SPARE3            15
#define OBJ_SPARE4            16
#define OBJ_SPARE5            17
#define OBJ_SPARE6            18
#define OBJ_SPARE7            19
#define OBJ_SPARE8            20

On failure, the return value is zero. Use GetLastError for extended error information.

Remarks

• The function works with any GDI object that can be selected into a device context.
• For object types OBJ_FONT, OBJ_PEN, and OBJ_BRUSH, the handle can be created by functions such as CreateFont, CreatePen, and CreateSolidBrush, respectively.
• Do not call DeleteObject on a stock object (e.g., GetStockObject(SYSTEM_FONT)).

Example: Determine if a handle is a bitmap.

#include <windows.h>
#include <stdio.h>

int main()
{
    HBITMAP hbmp = (HBITMAP)LoadImage(NULL, L"sample.bmp", IMAGE_BITMAP, 0, 0,
                                      LR_LOADFROMFILE | LR_CREATEDIBSECTION);
    if (!hbmp) { printf("Failed to load bitmap\n"); return 1; }

    int type = GetObjectType(hbmp);
    if (type == OBJ_BITMAP)
        printf("Handle is a bitmap.\n");
    else
        printf("Handle is not a bitmap (type=%d).\n", type);

    DeleteObject(hbmp);
    return 0;
}