windows api 获取字库点阵的问题

fulltimeangel 2012-04-26 02:20:21

大家好，我想开发一个windows应用程序，这个程序在绘制的时候从字库中取出一个汉字的位图数据，然后绘制出来。
我查了若干资料，参考一个已有的程序做，未达到理想的效果。我把代码附上，请各位帮忙指点迷津，感谢！

代码如下：

/*---------------------------------------------------------
DEVCAPS1.C -- Device Capabilities Display Program No. 1
(c) Charles Petzold, 1998
---------------------------------------------------------*/

#include <windows.h>
#include "tchar.h"

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

#define NUM 1000
#ifdef UNICODE
#define GetGlyphOutline GetGlyphOutlineW
#else
#define GetGlyphOutline GetGlyphOutlineA
#endif

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("draw line sample1 ") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("draw line sample1 "),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

FIXED FixedFromDouble(double d)
{

long l;

l = (long) (d * 65536L);
return *(FIXED *)&l;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxChar, cxCaps, cyChar,cxClient,cyClient;
TCHAR szBuffer[10],chText;
HDC hdc ;
UINT i,k ;
int j;
PAINTSTRUCT ps ;
TEXTMETRIC tm ;
RECT rcClient;
POINT currentPosition;
POINT apt[NUM];
POINT apt1[4]={0,0,50,200,150,300,400,247};
HFONT hFont,oldFont;
DWORD dwBufSize;

switch (message)
{
case WM_SIZE:
cxClient=LOWORD(lParam);
cyClient=HIWORD(lParam);
return 0;

case WM_CREATE:
hdc = GetDC (hwnd) ;
GetTextMetrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2 ;
cyChar = tm.tmHeight + tm.tmExternalLeading ;
ReleaseDC (hwnd, hdc) ;
return 0 ;

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
hFont=(HFONT)GetStockObject(ANSI_VAR_FONT);
oldFont=(HFONT)SelectObject(hdc,hFont);
MAT2 mat2;
mat2.eM11 = FixedFromDouble(2);
mat2.eM12 = FixedFromDouble(0);
mat2.eM21 = FixedFromDouble(0);
mat2.eM22 = FixedFromDouble(2);

GLYPHMETRICS gm;
//chText=L'泰';
chText =L'泰';
dwBufSize=GetGlyphOutline(hdc,chText,GGO_BITMAP,&gm,0L,NULL,&mat2);
if(dwBufSize>0 && dwBufSize<0xFFFF)
{
//char* lpBuf=NULL;
//lpBuf=(char*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,dwBufSize);

LPBYTE lpBuf=(LPBYTE)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,dwBufSize);

if(lpBuf)
{
GetGlyphOutline(hdc,chText,GGO_BITMAP,&gm,dwBufSize,lpBuf,&mat2);

int nByteCount = ((gm.gmBlackBoxX +31) >> 5) << 2;

for (i = 0; i<gm.gmBlackBoxY; i++)
{
for (j = 0; j<nByteCount; j++)
{
BYTE btCode = lpBuf[i* nByteCount + j];

for (k = 0; k<8; k++)
{

if (btCode & (0x80>>k))
{
SetPixel(hdc,j*8+k,i*1,RGB(244,0,0));
}
else
{
SetPixel(hdc,j*8+k,i*1,RGB(0,0,0));
}

}
}
}
HeapFree(GetProcessHeap(),0,lpBuf);
}
}
SelectObject(hdc,oldFont);
DeleteObject(hFont);
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

...全文

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fulltimeangel 2012-04-27

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13楼和15楼正解，非常感谢

向立天 2012-04-26

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WM_PAINT分支这样修改

case WM_PAINT:

		hdc		= BeginPaint (hwnd, &ps) ;

		hFont	= (HFONT)GetStockObject(DEFAULT_GUI_FONT);

		oldFont=(HFONT)SelectObject(hdc, hFont);

		MAT2 mat2;

		mat2.eM11 = FixedFromDouble(2);

		mat2.eM12 = FixedFromDouble(0);

		mat2.eM21 = FixedFromDouble(0);

		mat2.eM22 = FixedFromDouble(2);



		GLYPHMETRICS gm;



		chText =L'A';

		dwBufSize=GetGlyphOutline(hdc, chText, GGO_BITMAP, &gm, 0L, NULL, &mat2);

		if(dwBufSize>0 && dwBufSize<0xFFFF)

		{



			LPBYTE lpBuf=(LPBYTE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwBufSize);



			if(lpBuf)

			{

				GetGlyphOutline(hdc, chText, GGO_BITMAP, &gm, dwBufSize, lpBuf, &mat2);



				int nByteCount = ((gm.gmBlackBoxX +31) >> 5) << 2;



				for (i = 0; i<gm.gmBlackBoxY; i++)

				{

					for (j = 0; j<nByteCount; j++)

					{

						BYTE btCode = lpBuf[i* nByteCount + j];



						for (k = 0; k<8; k++)

						{



							if (btCode & (0x80>>k))

							{   

								SetPixel(hdc,j*8+k,i*1,RGB(244,0,0));

							}

							else

							{

								SetPixel(hdc,j*8+k,i*1,RGB(0,0,0));

							}  



						}

					}

				}

				HeapFree(GetProcessHeap(),0,lpBuf);

			}

		}

		SelectObject(hdc,oldFont);

		DeleteObject(hFont);   

		EndPaint (hwnd, &ps) ;

		return 0 ;

这里注意两个问题
一、如kaizi65535在13楼所说，字体需要是TrueType的
二、你要确定你预获取的字符被你选择的字体所支持

「已注销」 2012-04-26

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[Quote=引用 5 楼的回复:]

单步调试dwBufSize=4294967295;
[/Quote]
dwBufSize是无符号数，换成有符号数这个值不就是-1吗？

没有用过Windows的，只是用过FreeType

kaizi65535 2012-04-26

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GetGlyphOutline
The GetGlyphOutline function retrieves the outline or bitmap for a character in the TrueType font that is selected into the specified device context.

程序中的这两行：hFont=(HFONT)GetStockObject(ANSI_VAR_FONT);
oldFont=(HFONT)SelectObject(hdc,hFont);

其中ANSI_VAR_FONT不是TrueType font

所以改用：DEFAULT_GUI_FONT

DEFAULT_GUI_FONT Default font for user interface objects such as menus and dialog boxes. This is MS Sans Serif. Compare this with SYSTEM_FONT.

zhouzhipen 2012-04-26

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自己做字库吧

fulltimeangel 2012-04-26

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谁帮忙看看问题出在哪里？

fulltimeangel 2012-04-26

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用GetLastError输出错误代码1003

1003 Cannot complete this function. ERROR_CAN_NOT_COMPLETE

fulltimeangel 2012-04-26

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我刚才输出错误代码，输出的错误代码为1003

1003 Cannot complete this function. ERROR_CAN_NOT_COMPLETE

用户　昵称 2012-04-26

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弄点阵字库，将字符显示到dc下，然后扫描dc的颜色就可以了。

fulltimeangel 2012-04-26

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我参考了MSDN,MSDN解释如下：
If GGO_BITMAP, GGO_GRAY2_BITMAP, GGO_GRAY4_BITMAP, GGO_GRAY8_BITMAP, or GGO_NATIVE is specified and the function succeeds, the return value is greater than zero; otherwise, the return value is GDI_ERROR. If one of these flags is specified and the buffer size or address is zero, the return value specifies the required buffer size, in bytes.

If GGO_METRICS is specified and the function fails, the return value is GDI_ERROR.

我刚才测试了一下，果然返回的是GDI_ERROR，我再修改代码试试。

向立天 2012-04-26