在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
Zeme`/aBb
p(x1D]#Z[ 一、实现方法
&-8-xw#. ~P]HG;$?n 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
-hG 9 F)E7(Un`8 #pragma data_seg("shareddata")
0'q(XB`i= HHOOK hHook =NULL; //钩子句柄
H%01&u UINT nHookCount =0; //挂接的程序数目
SVg@xu+ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Wy^[4|6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
7>#L static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
~G{$ P'[ static int KeyCount =0;
WnJLX ^; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
I?> - #pragma data_seg()
#)PGQ)( MOqA$b 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
VH7iH|eW W3o}.|] DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
S,"ChR OO !S
w BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
?) ,xZ1" cKey,UCHAR cMask)
n6%jhv9H {
;8;~C" BOOL bAdded=FALSE;
tRUsZl for(int index=0;index<MAX_KEY;index++){
6t7;}t]t if(hCallWnd[index]==0){
>+;
b> hCallWnd[index]=hWnd;
4M0v1`k HotKey[index]=cKey;
ZB^4 (F')H HotKeyMask[index]=cMask;
Pv2nV!X6 bAdded=TRUE;
>Rki[SNb-b KeyCount++;
,$6MM6W;-F break;
JIY ^N9_ }
hyvV%z Z }
V&,<,iNN return bAdded;
5cNzG4z }
qh(-shZ4Du //删除热键
{ ck BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%B {D {
]!tYrSM! BOOL bRemoved=FALSE;
y9G 57D for(int index=0;index<MAX_KEY;index++){
Cj4b]*Q, if(hCallWnd[index]==hWnd){
YAC zznN if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)(ZPSg$/F hCallWnd[index]=NULL;
zy/tQGTr@ HotKey[index]=0;
|{/O)3 HotKeyMask[index]=0;
ILr6W@o5A bRemoved=TRUE;
^pQ;0[9Y0 KeyCount--;
vn%U;} break;
h[`Op#^x3 }
C(t6;&H }
^d5./M8Bd }
7].IT( return bRemoved;
3 ?|; on }
MY<!\4/ aji~brq Acq>M^E3 DLL中的钩子函数如下:
^0ZKHR(}e j=jrzG+` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E'BH7JV {
_@~kYz BOOL bProcessed=FALSE;
FUqhSW if(HC_ACTION==nCode)
<C.$Db&9 {
oIL+@}u7 if((lParam&0xc0000000)==0xc0000000){// 有键松开
qiKtR switch(wParam)
5.K$
X$+7} {
ETWmeMN case VK_MENU:
#PLB$$ MaskBits&=~ALTBIT;
w`#0
Y9O break;
m/F(h-? case VK_CONTROL:
Zz)oMw MaskBits&=~CTRLBIT;
!K^kKP*l break;
NX{-D}1X= case VK_SHIFT:
}Mb'tGW MaskBits&=~SHIFTBIT;
Hj4w
i| break;
x+:,b~Skk default: //judge the key and send message
2wuW5H8w{ break;
KlqJEtO_ }
@8M2'R\ for(int index=0;index<MAX_KEY;index++){
WPp\sIP if(hCallWnd[index]==NULL)
zR JKIm continue;
O->(9k < if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'ZZWH {
vkd<l&zD SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RAuAIiQ bProcessed=TRUE;
d7K17KiC }
!q6V@& }
;pNbKf: }
#2vG_B<M) else if((lParam&0xc000ffff)==1){ //有键按下
! lN a` switch(wParam)
?nGf Wx^ {
%:;[M|. case VK_MENU:
qT>&
v_< MaskBits|=ALTBIT;
>RqT7n8h break;
Jgv>$u case VK_CONTROL:
/2\=sTd MaskBits|=CTRLBIT;
BM$tywC break;
M>H^<N}'A case VK_SHIFT:
xE-`Bb MaskBits|=SHIFTBIT;
&{4Mo,x break;
GoVPo' default: //judge the key and send message
yJ`1},^ break;
rRG\:<a }
f!8m for(int index=0;index<MAX_KEY;index++){
f}ij=Y9 if(hCallWnd[index]==NULL)
bvu<IXX=2 continue;
t5v)6| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8qYGlew, {
U W)&Eky SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
mhkAI@)> bProcessed=TRUE;
@NwM+^ }
k+GK1Yl }
K2o0L5Lke }
[W\atmd" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ecI
2]aKi for(int index=0;index<MAX_KEY;index++){
~rJw$v if(hCallWnd[index]==NULL)
}~~^ZtJ\ continue;
MG5Sn*(C if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
W]Tt8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
XoQk'7"f //lParam的意义可看MSDN中WM_KEYDOWN部分
QRh4f\fY }
nMdN$E }
^5 =E`q". }
$JSC+o(q3# return CallNextHookEx( hHook, nCode, wParam, lParam );
QZa#iL }
P7.8tM2} ~+iJpW 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
PEn^.v@ R^kv!x;h BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*P\_:>bV( BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{s'_zSz p6l@O3 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
TvG:T{jwy !E#.WX LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{1U*:@j {
glX2L~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;Y&?ixx {
XaS_3d //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^PR,TR. SaveBmp();
@ ZPTf>J} return FALSE;
k^\&.63( }
A;`U{7IST …… //其它处理及默认处理
JG4*B|3 }
8+cpNX ` +UMZc y-q?pqt 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
o9d$
4s@/ ;Hp' x_xQ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
TdIFZ[<7 v oS"X
二、编程步骤
GJ_)Cl+5E ~@?-|xLqQ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
zXU{p\;)\ 3U.qN0] 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
"t&k{\$\ 207oEO] 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
qFChZ+3> %
j{pz 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
f>/ 1KV Jl4XE%0 5、 添加代码,编译运行程序。
q/-j`'A_pb "g1;TT:1~ 三、程序代码
+F&]BZ +ENW=N ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
y1My,
?"? #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
b!~%a #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
;C3?Ic #if _MSC_VER > 1000
JJ=is}S| #pragma once
"{"2h>o#D} #endif // _MSC_VER > 1000
ZboJszNb; #ifndef __AFXWIN_H__
nGgc~E$j #error include 'stdafx.h' before including this file for PCH
?JTyNg4< #endif
>d
V@9 #include "resource.h" // main symbols
Vzm+Ew
_ class CHookApp : public CWinApp
h`rjD d {
W&f Py%g
public:
R:^?6f<Z} CHookApp();
+p<R'/ // Overrides
=>%%]0 // ClassWizard generated virtual function overrides
B^Mtj5Oc //{{AFX_VIRTUAL(CHookApp)
:!!`!*!JH public:
>:E-^t% virtual BOOL InitInstance();
Ic!83- virtual int ExitInstance();
B2WX#/lgd //}}AFX_VIRTUAL
rh&Eu qE% //{{AFX_MSG(CHookApp)
L;7mt
4H // NOTE - the ClassWizard will add and remove member functions here.
nKkTnTSa // DO NOT EDIT what you see in these blocks of generated code !
Z M, ^R?e //}}AFX_MSG
iB`]Z@ZC DECLARE_MESSAGE_MAP()
?yeC
j1X };
8\
;G+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
eaP$/U
D? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gc[J.[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
uCS BOOL InitHotkey();
B4&pBiG&f6 BOOL UnInit();
pAmI ]( #endif
u$p|hd
d gdY/RDxn: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
DC7}Xly( #include "stdafx.h"
=U`c
}dhS #include "hook.h"
K"$ky,tU #include <windowsx.h>
bY$!"b~ #ifdef _DEBUG
&YKzK)@ #define new DEBUG_NEW
me^Gk/`Em #undef THIS_FILE
Vho0f<`E static char THIS_FILE[] = __FILE__;
iquGLwJ #endif
v("vUqhx2+ #define MAX_KEY 100
}AYSQ~: #define CTRLBIT 0x04
7Q}@L1A9F, #define ALTBIT 0x02
F|{?GV%hF #define SHIFTBIT 0x01
5B/\vLHg4 #pragma data_seg("shareddata")
FY*0gp HHOOK hHook =NULL;
Jo+C!kc UINT nHookCount =0;
7N=VVD~!b static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Nj8)HR static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
GFkte static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
c&(, static int KeyCount =0;
oe"ShhT static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
4\es@2 q #pragma data_seg()
/loNOutw HINSTANCE hins;
:]hfmWC void VerifyWindow();
1V?)zp BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
a Z,Wa-k //{{AFX_MSG_MAP(CHookApp)
0EU4irMa // NOTE - the ClassWizard will add and remove mapping macros here.
@sO.g_yM // DO NOT EDIT what you see in these blocks of generated code!
Z@A 1+kUS //}}AFX_MSG_MAP
RE$-{i END_MESSAGE_MAP()
f L?~1i = muY^Fx CHookApp::CHookApp()
Xrn~]P7 {
nzl,y, // TODO: add construction code here,
p:%E>K1< // Place all significant initialization in InitInstance
^
?9
~R" }
!
NEq|Y @$G
K<jl CHookApp theApp;
imQNfNm LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2Jv4l$$;* {
z#
B) b5 BOOL bProcessed=FALSE;
1bs95Fh9Q if(HC_ACTION==nCode)
iO`f{?b {
bYH_U4b if((lParam&0xc0000000)==0xc0000000){// Key up
-v@^6bQVp switch(wParam)
q)zvePO# {
%*=FLtBjo case VK_MENU:
<qx-%6 MaskBits&=~ALTBIT;
C ( ;7*] break;
b6BIDuRb case VK_CONTROL:
YO+d+5 MaskBits&=~CTRLBIT;
q[K)bg{HB break;
m:CpDxzbf case VK_SHIFT:
qChPT :a MaskBits&=~SHIFTBIT;
CP^^ct-C break;
j<?4N*S default: //judge the key and send message
ABGL9;.8 break;
ZVU)@[s }
li^E$9oWC for(int index=0;index<MAX_KEY;index++){
8+F2
!IM if(hCallWnd[index]==NULL)
v8N1fuP} continue;
$hh=-#J8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-+/| {
t[~i})yS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9x<
8(]\ bProcessed=TRUE;
^k=[P }
n\U6oJN }
r$zXb9a|< }
E;0"1
P|S else if((lParam&0xc000ffff)==1){ //Key down
JJXf%o0yq switch(wParam)
<h[^&CY{ {
,0xN#&?Ohh case VK_MENU:
u Rg^: MaskBits|=ALTBIT;
nr;/:[F break;
me" <+6 case VK_CONTROL:
{S!~pn&^Y MaskBits|=CTRLBIT;
T^t`Hp break;
NunT2JP. case VK_SHIFT:
uc8>B&B% MaskBits|=SHIFTBIT;
HtlXbzN%) break;
(aLnbJeJ default: //judge the key and send message
3:S "!F break;
up6LO7drW/ }
9AaixI for(int index=0;index<MAX_KEY;index++)
4 @h6|= {
$MHc4FE[ if(hCallWnd[index]==NULL)
ww*F}}( continue;
Emo]I[<&q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V qf}(3K0 {
seim?LK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w:Vs$, bProcessed=TRUE;
R?R6|4 }
_35?z"0 }
'yqp }
);vU=p"@ if(!bProcessed){
~ nIZg5 for(int index=0;index<MAX_KEY;index++){
ezeGw?/ if(hCallWnd[index]==NULL)
1Cthi[B continue;
Gf>T{Q`,is if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{S c1!2q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
e^fjla5 }
)`a R?_ }
SBA;p7^" }
E#OKeMK return CallNextHookEx( hHook, nCode, wParam, lParam );
@ M-bE= }
}|;n[+ } }T6jQ:?@ BOOL InitHotkey()
BDA\9m^3 {
@ggM5mm if(hHook!=NULL){
F6Ixu_s nHookCount++;
.u)YZN0\ return TRUE;
5UqCRz<,R }
Z|.. hZG else
y g7z?AZ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
=y
ff.3mW\ if(hHook!=NULL)
4CqZvdC nHookCount++;
3ul return (hHook!=NULL);
{^v50d }
(fl2?d5+C BOOL UnInit()
r mhB!Lo {
;X>KP,/r$ if(nHookCount>1){
'
x|B' nHookCount--;
~$5[#\5%G return TRUE;
#t\Oq9}^ }
#"jWPe,d BOOL unhooked = UnhookWindowsHookEx(hHook);
zR:S.e< if(unhooked==TRUE){
3j2}n
o8O nHookCount=0;
H$ v4N8D8I hHook=NULL;
SU1,+7" }
6YN4] return unhooked;
Sx}h$E: }
`8Gwf;P1 LY"/ Q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[}Nfs3IlBw {
GlaWBF# BOOL bAdded=FALSE;
'#XP:nqFkK for(int index=0;index<MAX_KEY;index++){
&*0V!+#6 if(hCallWnd[index]==0){
WWY9U hCallWnd[index]=hWnd;
F4@h}T5) HotKey[index]=cKey;
][9M_. HotKeyMask[index]=cMask;
nt4> 9; bAdded=TRUE;
H7WKnn@ KeyCount++;
t+pI<c^]y break;
~ohW9Z1 }
h0!j ;fn }
5s0H4 ?S return bAdded;
X"R;/tZ S4 }
3Vhm$y%Td joa$Y6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h/X),aK3 {
aJ2-BRn BOOL bRemoved=FALSE;
*`\>J.
for(int index=0;index<MAX_KEY;index++){
,30&VW## if(hCallWnd[index]==hWnd){
3Z`oI#-x if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
UOq$88sr hCallWnd[index]=NULL;
c=7L)w:I HotKey[index]=0;
yjr!8L:m HotKeyMask[index]=0;
_3`{wzMA bRemoved=TRUE;
b2z~C{l KeyCount--;
";Lpf]< break;
he/FtkU }
{8E
hC/= }
KzhldMJ^zq }
@wB$qd;v return bRemoved;
%Dy a- }
K }r%OOn0 Ek84yme# void VerifyWindow()
W}KtB1J
{
.n"aQ@! for(int i=0;i<MAX_KEY;i++){
gB?#T if(hCallWnd
!=NULL){ .
a~J.0co
if(!IsWindow(hCallWnd)){ sLCL\dWT
hCallWnd=NULL; _m@QeO'yh
HotKey=0; K'y;j~`-
HotKeyMask=0; jn]{|QZ
KeyCount--; )@Ly{cw
} Iu%S><'+
} CFVe0!\
} &a O3N
} #[2]B8NZ
b"p,~{
BOOL CHookApp::InitInstance() 7Rq;V=2YV
{ ($]y*|Obn
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9NVe>\s_
hins=AfxGetInstanceHandle(); fAJQ8nb{@]
InitHotkey(); '9-8_;
return CWinApp::InitInstance(); .F9>|Xx[
} D\>CEBt
S&9{kt|BI
int CHookApp::ExitInstance() sz_|py?0
{ `_<K#AG Ai
VerifyWindow(); V\Rbnvq
UnInit(); >0{{loqq
return CWinApp::ExitInstance(); ;/$zBr`'
} z!eY=G'
faThXq8B
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gVk_<;s
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +oeO0
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w$pBACX
#if _MSC_VER > 1000 &c0U\G|j
#pragma once ZY=x$($f
#endif // _MSC_VER > 1000 UT+B*?,h
/9;)zI
class CCaptureDlg : public CDialog m>~%.
(/x
{ cs,%Zk.xjw
// Construction F+|zCEc
public: CpO!xj+
BOOL bTray; uEH&]M>d_
BOOL bRegistered; Rm{S,
BOOL RegisterHotkey(); EG2NE,,r
UCHAR cKey; eQNo'cz
UCHAR cMask; _yumUk-QW
void DeleteIcon(); Em-88=XO
void AddIcon(); $#1i@dI
UINT nCount; <S%M*j
void SaveBmp(); -Y{P"!p0
CCaptureDlg(CWnd* pParent = NULL); // standard constructor nUD)G<v
// Dialog Data NFv9%$l-
//{{AFX_DATA(CCaptureDlg) ]_@5LvI
enum { IDD = IDD_CAPTURE_DIALOG };
W& w-yZ
CComboBox m_Key; pX+ `qxF\
BOOL m_bControl;
r1)Og
BOOL m_bAlt; R6*:Us0\FJ
BOOL m_bShift; Pqi>,c<&mL
CString m_Path; 3w#kvtDVm
CString m_Number; +-1t]`9k4
//}}AFX_DATA #toKT_
// ClassWizard generated virtual function overrides 1
@tVfn}
//{{AFX_VIRTUAL(CCaptureDlg) Y[#i(5w
public: H0_hQ:K
virtual BOOL PreTranslateMessage(MSG* pMsg); eo4;?z
protected: 9=89)TrY
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /w$<0hH#'8
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); y7txIe!<5
//}}AFX_VIRTUAL
Q47Rriw
// Implementation +v{<<
protected: ]z;%%'gW6
HICON m_hIcon; p=V (_
// Generated message map functions vE^Hk!^
//{{AFX_MSG(CCaptureDlg) L]I)E`s
virtual BOOL OnInitDialog(); " P c"{w
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %s6|w=.1
afx_msg void OnPaint(); y4^6I$M7V
afx_msg HCURSOR OnQueryDragIcon(); y".uu+hL`
virtual void OnCancel(); l
2y_Nz-;
afx_msg void OnAbout(); Zqc+PO3lw
afx_msg void OnBrowse(); UB|f{7~&
afx_msg void OnChange(); i!@L`h!rw
//}}AFX_MSG t ]7>' U
DECLARE_MESSAGE_MAP() sFqZ@t}~
}; ;Z\jX[H
#endif % V/J6
]W-l1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file P33x/#VVE
#include "stdafx.h" u(S~V+<@Z
#include "Capture.h" v `9IS+Z
#include "CaptureDlg.h" 2&S*> (
#include <windowsx.h> n(\5Z&
#pragma comment(lib,"hook.lib") X!KjRP\\
#ifdef _DEBUG sluR@[l
#define new DEBUG_NEW -Zh`h8gX
#undef THIS_FILE GcmN40
static char THIS_FILE[] = __FILE__; `}Ssc-A
#endif 6&5p3G{%0
#define IDM_SHELL WM_USER+1 }J$Q
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x'tYf^Va28
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n$i}r\
so
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c&vY0/ [
class CAboutDlg : public CDialog &W)Lzpx8c
{ 96x0'IsaG
public: apPn>\O
CAboutDlg(); c4E=qgP
// Dialog Data cD{I*t$
//{{AFX_DATA(CAboutDlg) Y5M>&}N
enum { IDD = IDD_ABOUTBOX }; }%Dsy2:y
//}}AFX_DATA BuII|j
// ClassWizard generated virtual function overrides Nz %{T
//{{AFX_VIRTUAL(CAboutDlg) ~ x-
R78'
protected: ;& ny< gQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M[Lj N
//}}AFX_VIRTUAL z'GYU=
// Implementation xj~5/)XX|X
protected: H48`z'o
//{{AFX_MSG(CAboutDlg) :f<3`x'
//}}AFX_MSG ]U.1z
DECLARE_MESSAGE_MAP() Au(zvgP
}; 8(J&_7u
\x\_I1|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
*(5y;1KU
{ !B_i~Rmg
//{{AFX_DATA_INIT(CAboutDlg) ,R_ KLd
//}}AFX_DATA_INIT xFvDKW)_X7
} 7m3|2Qv
T>,3V:X
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +MU|XT_5|6
{ aUUr&yf_L
CDialog::DoDataExchange(pDX); ;dgxeP;mp
//{{AFX_DATA_MAP(CAboutDlg) #
Un>g4>Rh
//}}AFX_DATA_MAP :I*G tq
} 7) aitDD
AvnK?*5!@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) MW*@fl<@?M
//{{AFX_MSG_MAP(CAboutDlg) +c$]Q-(
// No message handlers uSh!A
//}}AFX_MSG_MAP GAG=4g
END_MESSAGE_MAP() QwPLy O
.4DX/~F
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~7a(KJgvd"
: CDialog(CCaptureDlg::IDD, pParent) GZXBzZ}
{ BBnW0vAZ*
//{{AFX_DATA_INIT(CCaptureDlg) =g|e-XC
m_bControl = FALSE; t-7^deG'/n
m_bAlt = FALSE; +s?0yH-%p
m_bShift = FALSE; _' KJ:3e
m_Path = _T("c:\\"); /3`#ldb%}
m_Number = _T("0 picture captured."); ) inhPd
nCount=0; FaS}$-0
bRegistered=FALSE; ti$d.Kc(
bTray=FALSE; p!5=1$
//}}AFX_DATA_INIT {nTQc2T?;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,Yx"3i,
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
L7oLV?k
} jzCSxuZ7O
2
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U,Py+c6
{ Teq1VK3Hr
CDialog::DoDataExchange(pDX); CFdR4vuEI
//{{AFX_DATA_MAP(CCaptureDlg) a![x^@nF
DDX_Control(pDX, IDC_KEY, m_Key); =xzDpn>f
DDX_Check(pDX, IDC_CONTROL, m_bControl); z/09~Hc
DDX_Check(pDX, IDC_ALT, m_bAlt); D L0jA/f
DDX_Check(pDX, IDC_SHIFT, m_bShift); ti6\~SY
DDX_Text(pDX, IDC_PATH, m_Path); "A\.`*6
DDX_Text(pDX, IDC_NUMBER, m_Number); S
ykblP37
//}}AFX_DATA_MAP 7u8HcHl
} wV\;,(<x=%
`
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zGKDH=Yy ;
//{{AFX_MSG_MAP(CCaptureDlg)
i=67
ON_WM_SYSCOMMAND()
Z|zyO-
ON_WM_PAINT() *a}NRf}W
ON_WM_QUERYDRAGICON() %g1{nGah
ON_BN_CLICKED(ID_ABOUT, OnAbout) P=v 0|Y*q|
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oJ|8~:)
ON_BN_CLICKED(ID_CHANGE, OnChange) S-)mv'Al'F
//}}AFX_MSG_MAP ?M2#fD]e
END_MESSAGE_MAP() pbg[\UJyd
}<?1\k
BOOL CCaptureDlg::OnInitDialog() rzmd`)g
{ Vf?+->-?{
CDialog::OnInitDialog(); nT
UKA
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bpq2TgFj
ASSERT(IDM_ABOUTBOX < 0xF000); 1O" Mo
CMenu* pSysMenu = GetSystemMenu(FALSE); ERSo&8
if (pSysMenu != NULL) 00s&<EM
{ /JaCbT?*T
CString strAboutMenu; fwvPh&U&
strAboutMenu.LoadString(IDS_ABOUTBOX); qf7:Q?+.|
if (!strAboutMenu.IsEmpty()) L0ZgxG3:g
{ _3_d;j#G U
pSysMenu->AppendMenu(MF_SEPARATOR); 8S;]]*cD~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); BI9~%dm
} `dB!Ia|
} aDJ\%
SetIcon(m_hIcon, TRUE); // Set big icon w7n6@"q
SetIcon(m_hIcon, FALSE); // Set small icon kz4d"bTb
m_Key.SetCurSel(0); GE+%V7
RegisterHotkey(); @WcK<Qho
CMenu* pMenu=GetSystemMenu(FALSE); z\iz6-\&y
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y6LoPJ
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D$k<<dvv
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q_p!;3
return TRUE; // return TRUE unless you set the focus to a control }jj@A !N
} #ma#oWqF }
@8[3]<
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) S;0,UgB1
{ *.g0;\HF
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8<z]rLQw?%
{ 6U{&`8C
CAboutDlg dlgAbout; Z<j(ZVO
dlgAbout.DoModal(); R-xWZRl>
} }%j@%Ep[
else u_0&`zq
{ d'1L#`?
CDialog::OnSysCommand(nID, lParam); )ZkQWiP-
} %m8;Lh-X
} Vwj^h
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void CCaptureDlg::OnPaint() tx-HY<
{ t?[|oz:v
if (IsIconic()) 7nh,j <~;2
{ 4AI\'M"d
CPaintDC dc(this); // device context for painting JaC
=\\B
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); < 8yv(
// Center icon in client rectangle u&Ze$z
int cxIcon = GetSystemMetrics(SM_CXICON); G]q1_q4P1?
int cyIcon = GetSystemMetrics(SM_CYICON); ]6wo]nV[P
CRect rect; &"bcI7uGT
GetClientRect(&rect); 5w:
int x = (rect.Width() - cxIcon + 1) / 2; }F=+*-SYZ
int y = (rect.Height() - cyIcon + 1) / 2; 2FHWOy
/N@
// Draw the icon sP1wO4M?{
dc.DrawIcon(x, y, m_hIcon); Aj`zT'
} bv&A)h"S
else R(dVE\u
{ 2t h\%
CDialog::OnPaint(); u(ep$>[F#_
} oObm5e*Z
} YmP`Gg#>p
p"9a`/
HCURSOR CCaptureDlg::OnQueryDragIcon() xA;o3Or
{ ;lqtw]4v
return (HCURSOR) m_hIcon; cnm&oC 6
} :[#g_*G@p
*%JncK'
void CCaptureDlg::OnCancel() 'I|A*rO
{ Y,O)"6ev
if(bTray) K/;FP'.
DeleteIcon(); x <^vJ1
CDialog::OnCancel(); {3=\x
} (yk^%
#E`-b9Q
void CCaptureDlg::OnAbout() sjOyg!e
{ (P;z*
"q
CAboutDlg dlg; <1tFwC|4BJ
dlg.DoModal(); [t55Kz*cD
} sW)C6 #
>Lo 0,b$
void CCaptureDlg::OnBrowse() &IGTCTBP
{ bSmF"H0cP
CString str; FY%v \`@1*
BROWSEINFO bi; i3I'n*
char name[MAX_PATH]; XGE:ZVpW
ZeroMemory(&bi,sizeof(BROWSEINFO)); tqLn A
bi.hwndOwner=GetSafeHwnd(); j?Ki<MD1
bi.pszDisplayName=name; [; M31b3
bi.lpszTitle="Select folder"; [u[`!L=
bi.ulFlags=BIF_RETURNONLYFSDIRS; f$a%&X6"-
LPITEMIDLIST idl=SHBrowseForFolder(&bi); k)D:lpxv
if(idl==NULL) @vWC "W
return; Ui6f>0?
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (uG.s %I
str.ReleaseBuffer(); QF/A-[V
m_Path=str; 3nt&Sf
if(str.GetAt(str.GetLength()-1)!='\\') wCiDvHF5+C
m_Path+="\\"; et";*EZJX
UpdateData(FALSE); ,<$6-3sC-
} A:Z$i5%'
}J}a;P4
void CCaptureDlg::SaveBmp() c-z2[a8
{ -L>\ 58`
CDC dc; WN9<
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %=x|.e@J
CBitmap bm; Ojj:YLlY>
int Width=GetSystemMetrics(SM_CXSCREEN); z)Xf6&
int Height=GetSystemMetrics(SM_CYSCREEN); )'8DK$.
bm.CreateCompatibleBitmap(&dc,Width,Height); }^uUw&
CDC tdc; &Im{p7gf!b
tdc.CreateCompatibleDC(&dc); WrhC
q6
CBitmap*pOld=tdc.SelectObject(&bm); Zd@'s.,J
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IuDg-M[
tdc.SelectObject(pOld); Q g=k@
BITMAP btm; ? lC.
Pq
bm.GetBitmap(&btm); zmkqqiDp_
DWORD size=btm.bmWidthBytes*btm.bmHeight; @AUx%:}0Y:
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 6U;pYWht
BITMAPINFOHEADER bih; iorKS+w"
bih.biBitCount=btm.bmBitsPixel; ,j
wU\xo`C
bih.biClrImportant=0; [ P\3XSR
bih.biClrUsed=0; ]T\K-;i
bih.biCompression=0; evf){XhT;n
bih.biHeight=btm.bmHeight; F\!;}z
bih.biPlanes=1; ?&Si P-G
bih.biSize=sizeof(BITMAPINFOHEADER); @`2<^-r\
bih.biSizeImage=size; N#{d_v^H?d
bih.biWidth=btm.bmWidth; LXj2gsURu%
bih.biXPelsPerMeter=0; >nmby|XtW
bih.biYPelsPerMeter=0; E",s]
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5)4*J.
static int filecount=0; *leQd^47
CString name; 3/8o)9f.
name.Format("pict%04d.bmp",filecount++); DQW^;Ls
name=m_Path+name; m`C(y$8fU
BITMAPFILEHEADER bfh; V x1C4
bfh.bfReserved1=bfh.bfReserved2=0; vPEL'mw/3#
bfh.bfType=((WORD)('M'<< 8)|'B'); [0CoQ5:d?&
bfh.bfSize=54+size; b)@%gS\F
bfh.bfOffBits=54; GL&ri!,
CFile bf; 7k{Oae\$
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]d?`3{h9LD
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); flTK
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pc&/'zb
bf.WriteHuge(lpData,size); vC~];!^
bf.Close(); 8r / ]Q
nCount++; xdp!'1n."g
} |RwpIe8~
GlobalFreePtr(lpData); p,}-8#K[
if(nCount==1) ^_3idLE
m_Number.Format("%d picture captured.",nCount); x!bFbi#!"
else ?KpHvf'
m_Number.Format("%d pictures captured.",nCount); !o~% F5|t
UpdateData(FALSE); V1Dwh@iS
} (:E_m|00;
y
%Get
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W>eJGZ<
{ b_-ESs]g
if(pMsg -> message == WM_KEYDOWN) +<6L>ZAL
{ E&V"z^qs_
if(pMsg -> wParam == VK_ESCAPE) ~PaD _W#xP
return TRUE; 'qQ 5K
o
if(pMsg -> wParam == VK_RETURN) e/lfT?J\
return TRUE; '1;Q'-/J
} aWek<Y~+
return CDialog::PreTranslateMessage(pMsg); @uz&]~+`
} yCkfAx8]
'-3AWBWI1
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !> b>"\b
{ i`7{q~d=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ iaXNf
])?
SaveBmp(); K"Vv=
return FALSE; o!L1Qrh
} `;WiTE)&)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z `O.JE
CMenu pop; /%}+FMj
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3B/ GcltfM
CMenu*pMenu=pop.GetSubMenu(0); QE}S5#_"
pMenu->SetDefaultItem(ID_EXITICON); /,$;xt-J35
CPoint pt; gbwKT`N*
GetCursorPos(&pt); DbJ:KQ!*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .g DWv
if(id==ID_EXITICON) 4][m!dsU
DeleteIcon(); t5N@z
else if(id==ID_EXIT) 84)$ CA+NX
OnCancel(); 3v;o`Em&
return FALSE; ??12
J#
} ~\4l*$3(^
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )v;>6(
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ('Wo#3b$
AddIcon(); )u ]J`.OA
return res; & S_gNa
} ZH/^``[.
{"!V&}
void CCaptureDlg::AddIcon() +l@H[r;$
{ B)/X:[
NOTIFYICONDATA data; kW\=Z1\#
data.cbSize=sizeof(NOTIFYICONDATA); ?XL [[vyr
CString tip; Ya*lq!
u
tip.LoadString(IDS_ICONTIP); lxj_(Uo
data.hIcon=GetIcon(0); nH}api^0A
data.hWnd=GetSafeHwnd(); b>;>*'e
strcpy(data.szTip,tip); QE84l
data.uCallbackMessage=IDM_SHELL; (G<"nnjK
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rmpJG|(
data.uID=98; LSlaz
Shell_NotifyIcon(NIM_ADD,&data); x,IU]YW@
ShowWindow(SW_HIDE); #rMMOu9r2
bTray=TRUE; |xQG
} :Gqyj_|<
9=@j]g|
void CCaptureDlg::DeleteIcon() [Ua4{3#
{
dKDtj:
NOTIFYICONDATA data; -liVYI2s
data.cbSize=sizeof(NOTIFYICONDATA); EAxg>}'1j
data.hWnd=GetSafeHwnd(); 1QtT*{zm$F
data.uID=98; }Xyu"P
Shell_NotifyIcon(NIM_DELETE,&data); w7p%6m
ShowWindow(SW_SHOW); XV1#/@H;
SetForegroundWindow(); y;Q_8|,F
ShowWindow(SW_SHOWNORMAL); /:>qhRFJA:
bTray=FALSE; (*7edc"F
} P~redX=t@
]8ua>1XS
void CCaptureDlg::OnChange() E:xpma1Qf
{ nf+8OH7
RegisterHotkey(); $EW31R5h<s
} ].]yqD4P
(`GO@
BOOL CCaptureDlg::RegisterHotkey() v3[Z]+ ]
{ gg'lb{oG
UpdateData(); 9X,dV7 yW
UCHAR mask=0; Y oNg3
UCHAR key=0; T
nAd!
if(m_bControl) d]VL(&
mask|=4; \hQ[5>
if(m_bAlt) cZ\#074u/
mask|=2; wX8T;bo&
if(m_bShift) ~/Aw[>_;
mask|=1; Qc\JUm]
key=Key_Table[m_Key.GetCurSel()]; ':!w%& \
if(bRegistered){ 6hXL`A&},
DeleteHotkey(GetSafeHwnd(),cKey,cMask); y`:}~nUdT
bRegistered=FALSE; T9KzVxHp5
} '[I_Iu#,
cMask=mask; 8HX(1nNj}
cKey=key; )+wBS3BC
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9H2^4D8
return bRegistered; YoGnk^$
} `j(\9j ok
QUb#;L@okn
四、小结 n%I%Kbw
!1C3{
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。