windows api 获取字库点阵的问题
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);
MAT2mat2;
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) ;
}
[解决办法]
是不是GetGlyphOutline调用失败了
看看GetGlyphOutline的说明
http://baike.baidu.com/view/1080765.htm
[解决办法]
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.
[解决办法]
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 ;