菜鸟提问：怎样从HBITMAP获得BMP的尺寸？（SDK）

thisisjjjj 2003-09-11 08:54:52

用LoadBitmap获得HBITMAP类型的handle，怎么才能得到BMP的尺寸信息？
我记得尺寸信息记录在一个BITMAPINFO结构里的，但是如何提取呢？

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thisisjjjj 2003-09-11

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GOOD！

结帖

thisisjjjj 2003-09-11

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好象行的通哎，我试试

lshadow 2003-09-11

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BITMAP bm;
HBITMAP hBitmap;
GetObject(hBitmap, sizeof(BITMAP), (LPBYTE)&bm);

这样ok了吧

thisisjjjj 2003-09-11

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恩，怎么得到呢？

lshadow 2003-09-11

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BITMAP结构里有尺寸信息

thisisjjjj 2003-09-11

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我要用SDK完成，不要MFC

lshadow 2003-09-11

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用CBitmap就很简单啊,
有CBitmap::GetBitmap

thisisjjjj 2003-09-11

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晕死了
我要获取尺寸信息啊
干吗又要去设置它？

lshadow 2003-09-11

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就是说如果没有 SetBitmapDimensionEx 过的话，返回值就是0

lshadow 2003-09-11

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GetBitmapDimensionEx
The GetBitmapDimensionEx function retrieves the dimensions of a bitmap. The retrieved dimensions must have been set by the SetBitmapDimensionEx function.

BOOL GetBitmapDimensionEx(
HBITMAP hBitmap, // handle to bitmap
LPSIZE lpDimension // dimensions
);
Parameters
hBitmap
[in] Handle to the bitmap.
lpDimension
[out] Pointer to a SIZE structure to receive the bitmap dimensions.
Return Values
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Windows NT/ 2000: To get extended error information, call GetLastError.

Remarks
The function returns a data structure that contains fields for the height and width of the bitmap, in .01-mm units. If those dimensions have not yet been set, the structure that is returned will have zeroes in those fields

thisisjjjj 2003-09-11

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返回值两个都是0

……
HBITMAP hBitmap = LoadBitmap(......);
……
SIZE SizeOfBitmap;
GetBitmapDimensionEx(hBitmap, &SizeOfBitmap);
……

结果:
SizeOfBitmap.cx = 0
SizeOfBitmap.cy = 0

duqiang2050 2003-09-11

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BOOL GetBitmapDimensionEx(
HBITMAP hBitmap, // handle to bitmap
LPSIZE lpDimension // address of structure receiving dimensions
);

lpDimension是返回值
lpDimension->cx
lpDimension->cy
就是尺寸

thisisjjjj 2003-09-11