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:
pGGx.&5#82
R|H_F#eVn} 一、实现方法
\:wLUGFl5 b(H)8#C 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:
H@WQO]PA kXbdR #pragma data_seg("shareddata")
7%4@* HHOOK hHook =NULL; //钩子句柄
1
+'HKT} UINT nHookCount =0; //挂接的程序数目
bwAL: static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
& A<Pf.Us static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;F<)BEXC< static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
h8_~ OX static int KeyCount =0;
' ! ls"qo static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
rfNt #pragma data_seg()
gJ>HFid_C Af"vSL 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。
cZ~\jpK >ak53Ij$ 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:
u +OfUBrf v{2Vg BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
^~dvA)bH cKey,UCHAR cMask)
+(<}`!9M* {
~X
-.@k' BOOL bAdded=FALSE;
v+Q#O[ for(int index=0;index<MAX_KEY;index++){
I:aG(8Bi)H if(hCallWnd[index]==0){
wfrWpz=FO hCallWnd[index]=hWnd;
?RD)a`y51 HotKey[index]=cKey;
e?D,=A4mV" HotKeyMask[index]=cMask;
%C[ ;& bAdded=TRUE;
z[wk-a+w KeyCount++;
Kv:ih=? break;
Eqva]
4 }
aJ Du_ }
RFu]vFff return bAdded;
qqYH}%0dz }
BDg6ZI<n //删除热键
k]`3if5> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[]M+(8Z_P {
Uq6..<# BOOL bRemoved=FALSE;
n[/|M for(int index=0;index<MAX_KEY;index++){
%j=,c{`Q if(hCallWnd[index]==hWnd){
s"|N-A=cS if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+6{KrREX) hCallWnd[index]=NULL;
YtrMJ" HotKey[index]=0;
VRoeq { HotKeyMask[index]=0;
G#! j` bRemoved=TRUE;
(Rk g KeyCount--;
w`Dzk.2 break;
A4?_0:< }
&~Q ?k }
>:`Y]6z }
Q=9S?p
M return bRemoved;
UmU=3et<Wj }
y*6r&989 5\tYs=>b< 3;`93TO{ DLL中的钩子函数如下:
U<NpDjc" g5to0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
OX4+1@$tk {
EQ>bwEG BOOL bProcessed=FALSE;
*R>I%?]V3 if(HC_ACTION==nCode)
*#;rp~ {
!`='K
+ if((lParam&0xc0000000)==0xc0000000){// 有键松开
+-#| M|a switch(wParam)
}h>e=< {
)[)-.{q case VK_MENU:
4f"a/(>* MaskBits&=~ALTBIT;
<96ih$5D1 break;
l(zkMR$b8 case VK_CONTROL:
9ffRY,1@ MaskBits&=~CTRLBIT;
nx,67u/Pb break;
N_r*Ig case VK_SHIFT:
>|7&hj$ MaskBits&=~SHIFTBIT;
zT~ GBC-IX break;
bah5 f default: //judge the key and send message
Pwz^{*u] break;
j&Ayk* }
i4!n Oyk for(int index=0;index<MAX_KEY;index++){
(s{%XB:K if(hCallWnd[index]==NULL)
Af0E_ continue;
0tB9X9 :, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Zk}e?Grc {
?#D@e5Wf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2#1FI0,Pa* bProcessed=TRUE;
$X~=M_W }
tQJ@//C\z }
+.\JYH=yEr }
'7'cKp else if((lParam&0xc000ffff)==1){ //有键按下
OG 5n9sx switch(wParam)
&TWO/F+Y {
!,\9,lc case VK_MENU:
n]coqJ MaskBits|=ALTBIT;
8yFD2(# break;
?-\K Vha case VK_CONTROL:
8N-~ .p MaskBits|=CTRLBIT;
L +. K}w break;
_I|wp<R case VK_SHIFT:
S_2I8G^A MaskBits|=SHIFTBIT;
<k^9l6@ break;
WM=kr$/3 default: //judge the key and send message
>o>'@)I?e6 break;
-07(#> }
B{1+0k for(int index=0;index<MAX_KEY;index++){
TJsT .DWW~ if(hCallWnd[index]==NULL)
9f,HjRP continue;
<)n
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#^#)OQq] {
|Be.r{l SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s9`T% pg bProcessed=TRUE;
NK#Dq&W+& }
`(B1 "qRi }
a/)TJv }
S8,+6+_7 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
`O}.
.N]g for(int index=0;index<MAX_KEY;index++){
<6L$:vT_ if(hCallWnd[index]==NULL)
{/0,lic continue;
vW)GUAF[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p6}jCGJ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
oS,<2Z //lParam的意义可看MSDN中WM_KEYDOWN部分
,}FYY66K }
NKd@Kp`, }
PL+fLCk,I }
={L:q8v) return CallNextHookEx( hHook, nCode, wParam, lParam );
`8'T*KU }
[>_(q|A6+ )If[pw@j 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
&*)tqQeQf BTd'bD~EA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
LK:|~UV? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[Q 2t,tQx Vj?.' ( 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
GF/p|I D UN>hJN;c LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
zRE7 w: {
!&'xkw ` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
&aF_y_f\ {
F~l3?3ZV //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?ST}0F00} SaveBmp();
[#R%jLEJ2 return FALSE;
q75F^AvH }
09%eaoW …… //其它处理及默认处理
p6HZ2Q:a }
?pF;{ e&0B4wVAQ zw5~|< 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Le3S;SY& o$-8V:)6d 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。
v\MH;DW^Z >$Fc=~;Ba 二、编程步骤
mML^kgy\N #!`zU4&2 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
IYCKF/2o s)M2Z3>+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
R<U?)8g,h~ 2bxT%xH:g 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
~y|%D; A|>C3S 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
~AE034_N EhD|\WLx! 5、 添加代码,编译运行程序。
yh0|f94m k=~?!+p7 三、程序代码
\W(p )M @`_j't, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
N0qC/da1 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
U/iAP W4U #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6=@n
b3D% #if _MSC_VER > 1000
S|>Up%{n[ #pragma once
I Mv^ 9T: #endif // _MSC_VER > 1000
x1}q!)e #ifndef __AFXWIN_H__
q;>BltU #error include 'stdafx.h' before including this file for PCH
eh`V#%S= #endif
zPw
R1>gL #include "resource.h" // main symbols
mm{U5 class CHookApp : public CWinApp
+I Ze`M%n {
-y\N 9 public:
.nSupTyG CHookApp();
Z956S$gS // Overrides
c^6`"\X^g // ClassWizard generated virtual function overrides
iZSSd{jO //{{AFX_VIRTUAL(CHookApp)
R/Y/#X^b public:
Cir =( virtual BOOL InitInstance();
CMg83 virtual int ExitInstance();
rvmI
8 //}}AFX_VIRTUAL
KOmP-q=6 //{{AFX_MSG(CHookApp)
18n84RkI9 // NOTE - the ClassWizard will add and remove member functions here.
-DuiK:mp // DO NOT EDIT what you see in these blocks of generated code !
*g,?13Q_ //}}AFX_MSG
n5JB'F) DECLARE_MESSAGE_MAP()
NuooA };
cdfll+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
g~y9j88? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
apMYBbC BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
c0qv11,:t BOOL InitHotkey();
r2](~&i2 BOOL UnInit();
a:|4q #endif
bK].qN :te xl //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6>L. )V #include "stdafx.h"
tZ@+18 #include "hook.h"
z1FbW&V #include <windowsx.h>
D}061~zb$ #ifdef _DEBUG
eFnsf}(Iy #define new DEBUG_NEW
k,@J& #undef THIS_FILE
={b
]
static char THIS_FILE[] = __FILE__;
O\LW
8\M #endif
=k*0O_ #define MAX_KEY 100
R`**!ku #define CTRLBIT 0x04
#PrV)en #define ALTBIT 0x02
wr$}AX #define SHIFTBIT 0x01
g_>ZE #pragma data_seg("shareddata")
vW{cBy HHOOK hHook =NULL;
tT8jC:oVa UINT nHookCount =0;
_$'Mx'IC= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
^kl9U+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
cyhD%sB[D9 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>b["T+ static int KeyCount =0;
O9|'8"AF
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
epR~Rlw>2 #pragma data_seg()
AslH
V@K HINSTANCE hins;
L@z !,r, void VerifyWindow();
NDOZ!`LqH BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Uo @NK //{{AFX_MSG_MAP(CHookApp)
psZeu*/r // NOTE - the ClassWizard will add and remove mapping macros here.
bF KPV%` // DO NOT EDIT what you see in these blocks of generated code!
jccW8g~
~ //}}AFX_MSG_MAP
@|GeR END_MESSAGE_MAP()
jSFN/C.9h 46zaxcY<! CHookApp::CHookApp()
{IMzR'PN {
b66X])+4jE // TODO: add construction code here,
pq[mM!;#v // Place all significant initialization in InitInstance
4v|/+J6G }
:xw3b)KS 7RP_
^Cr+ CHookApp theApp;
^c\ IZ5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
t>wxK
, {
Lmwh`oOl BOOL bProcessed=FALSE;
nFfCw%T? if(HC_ACTION==nCode)
}91mQ`3 {
Qsntf.fT if((lParam&0xc0000000)==0xc0000000){// Key up
P*PL6UQ switch(wParam)
f^)uK+:. {
3] qlz?5 case VK_MENU:
O&,O:b:@ MaskBits&=~ALTBIT;
fl"y@;;#h break;
9 <KtI7 case VK_CONTROL:
~& 5&s MaskBits&=~CTRLBIT;
Su"_1~/2S break;
lkfFAwnc case VK_SHIFT:
k,7+=.6 MaskBits&=~SHIFTBIT;
vs1Sh?O break;
s3-ktZ@ default: //judge the key and send message
>fye^Tx break;
,w%oSlOu }
z9ShP&^4[ for(int index=0;index<MAX_KEY;index++){
eUkoVr if(hCallWnd[index]==NULL)
JQ_gM._3 continue;
KupMndK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^V}R(gDu}s {
O|Ic[XfLx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x~;EH6$5'/ bProcessed=TRUE;
tHtV[We.: }
/Tj"Fl\h }
<M,H9^l3 }
r.W,-%=bL else if((lParam&0xc000ffff)==1){ //Key down
rh`.$/^ switch(wParam)
Yg)V*%0n {
M%{?\)s case VK_MENU:
g`OOVaB MaskBits|=ALTBIT;
R*@[Pg* break;
jBv$^L case VK_CONTROL:
2 1~7{# MaskBits|=CTRLBIT;
b%;59^4AjD break;
JYd7@Msfc case VK_SHIFT:
b;L>%; MaskBits|=SHIFTBIT;
}E5#X R break;
jRG\C=&(x default: //judge the key and send message
fT3*>^Uv break;
g?~ Tguv }
-k&{nD| for(int index=0;index<MAX_KEY;index++)
m`$>:B {
V+qJrZ,i if(hCallWnd[index]==NULL)
d>, V continue;
lmQ 6X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PDIclIMS'F {
5ttMua <G? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
KO|pJ3 bProcessed=TRUE;
k=7Gr;;l=p }
C,r`I/; }
/u)Rppu }
:B=8_M if(!bProcessed){
R|1xXDLm*E for(int index=0;index<MAX_KEY;index++){
0HR|aqPo if(hCallWnd[index]==NULL)
ck+b/.gw` continue;
gKN}Of@^1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
L"foL SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
XY{:tR_al }
3eTrtCe$ }
ESMG<vW&f }
*J_iXu| return CallNextHookEx( hHook, nCode, wParam, lParam );
'e]HP-Y< }
@ EmGexLPM d9Z&qdxTKq BOOL InitHotkey()
ZCQ<%f {
90s;/y( if(hHook!=NULL){
"#twY|wW nHookCount++;
Cqgk return TRUE;
%f(S'<DhC }
-2\ZzK0tM else
5r4gmy> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
lRDxIuTK if(hHook!=NULL)
i_u
{5 U; nHookCount++;
2L2 VVO return (hHook!=NULL);
mF'-Is }
=3|pHc hJ4 BOOL UnInit()
&Vt2be* {
Ad;S=h8: if(nHookCount>1){
s=N#CE nHookCount--;
S<nP80C return TRUE;
:p<kQ4
}
X0WNpt&h BOOL unhooked = UnhookWindowsHookEx(hHook);
PW%1xHLfk if(unhooked==TRUE){
MBB5wj nHookCount=0;
PK6*}y hHook=NULL;
@P:R~m2 }
4.|-m.a return unhooked;
S
Pn8\2Cj }
=4tO0 F aFp_P? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~uI**{ {
{'h_'Y`bOQ BOOL bAdded=FALSE;
;1W6"3t-Y for(int index=0;index<MAX_KEY;index++){
$Z;B QJVH if(hCallWnd[index]==0){
d/{Q
t hCallWnd[index]=hWnd;
53
@oP HotKey[index]=cKey;
(*,8KLV_i HotKeyMask[index]=cMask;
7DtIVMiK bAdded=TRUE;
$PSY:Zz KeyCount++;
Q.,DZp break;
(0i'Nb" }
n%/i:Whs }
ImIqD&a-h return bAdded;
1^C|k(t }
_>Pk8~m iJdP>x BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H9RGU~q4s[ {
jfUJ37zNZr BOOL bRemoved=FALSE;
b5j*xZv
for(int index=0;index<MAX_KEY;index++){
I>A^I if(hCallWnd[index]==hWnd){
]gu1# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#{!O,`qD hCallWnd[index]=NULL;
-(*nSD9 HotKey[index]=0;
vwKw?Z0%J HotKeyMask[index]=0;
[O2h-` bRemoved=TRUE;
+YTx
KeyCount--;
#?9Q{0e break;
<uZPqi|| }
*z0K%@M }
cd!|Ne>fe }
.nEs:yn return bRemoved;
Is13: }
]pnYvXf>! v~"Ef_` void VerifyWindow()
k6@b| {
J58#$NC
`' for(int i=0;i<MAX_KEY;i++){
o{V#f_o if(hCallWnd
!=NULL){ bM"fk&
if(!IsWindow(hCallWnd)){ 2MuO*.9D
hCallWnd=NULL; ga-{!$b*
HotKey=0; tBseqS3<
HotKeyMask=0; OX+hZ<y
KeyCount--; 6lsL^]7
} *>k!hq;j
} $A`xhh[
} !.EcP=S
} )1f+ld%R
o/cr{>"N
BOOL CHookApp::InitInstance() nq'M?c#E
{ R:A'&;S
AFX_MANAGE_STATE(AfxGetStaticModuleState()); I!0JG`&
hins=AfxGetInstanceHandle(); HA!t$[_Ve
InitHotkey(); 0Uw
^FcW
return CWinApp::InitInstance(); WSLy}@`Vx
} :uo[&&c
EKuSnlTXba
int CHookApp::ExitInstance() IIxJqGN:
{ ExCM<$,
VerifyWindow(); WL l_'2h
UnInit(); T~X41d\
return CWinApp::ExitInstance(); q#NR32byF
} p<KIF>rf|
=_
y\Y@J
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %c X"#+e
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >,"sHm}l%
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d&jjWlHgEN
#if _MSC_VER > 1000 BwxnDe G)
#pragma once _A 2Lv]vfV
#endif // _MSC_VER > 1000 jWvtv ng
B'}"AC"
class CCaptureDlg : public CDialog +8AvTSgX%
{ *Y%Jl
o
// Construction n 'K6vW3
public: ~c*
UAowS
BOOL bTray; T%(C-Quh
BOOL bRegistered;
6Y1J2n"
BOOL RegisterHotkey(); :CaTP% GW
UCHAR cKey; ZenPw1 -
UCHAR cMask; S`iR9{+&
void DeleteIcon(); !>n|c$=;qk
void AddIcon(); #Fs|f3-@
UINT nCount; &[_ZXVva~
void SaveBmp(); P~RhUKfd
CCaptureDlg(CWnd* pParent = NULL); // standard constructor -7%X]
// Dialog Data ^ve14mbF#.
//{{AFX_DATA(CCaptureDlg) %d;<2b0
enum { IDD = IDD_CAPTURE_DIALOG }; ]^K;goQv
CComboBox m_Key; *HE^1IEl
BOOL m_bControl; L8&D(wh/f
BOOL m_bAlt; 8>N wCjN
BOOL m_bShift; gnLn7?
CString m_Path; ?n]FNjd
CString m_Number; |~K(F<;j
//}}AFX_DATA oM,- VUr
// ClassWizard generated virtual function overrides Izo! rC
//{{AFX_VIRTUAL(CCaptureDlg) _1|$P|$P.
public: WUEHB
virtual BOOL PreTranslateMessage(MSG* pMsg); \Q&,ISO\
protected: %8mm Hh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +E5=$`
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); h*w6/ZL1
//}}AFX_VIRTUAL ? \m3~6y
// Implementation S1bAu
<
protected: *Zbuq8>
HICON m_hIcon; G[Tl%w
// Generated message map functions cozXb$bBY
//{{AFX_MSG(CCaptureDlg) gU1 #`r>[)
virtual BOOL OnInitDialog(); CO^Jz
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cCiI{
afx_msg void OnPaint(); rmd;\)#*`
afx_msg HCURSOR OnQueryDragIcon(); P)6lu8zQ
virtual void OnCancel(); t6lE#<xZV;
afx_msg void OnAbout(); n~g LPHY
afx_msg void OnBrowse(); idc4Cf+4
afx_msg void OnChange(); A\QJLWBv^$
//}}AFX_MSG 7:Ztuc]
DECLARE_MESSAGE_MAP() ?=Db@97
}; O#eZ<hNV
#endif p
&(OZJT
|L::bx(
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j9R6ta3\l
#include "stdafx.h" #sB,1"
#include "Capture.h" bRo|uJ:d
#include "CaptureDlg.h" %Mn.e a
#include <windowsx.h> 1n=_y o
#pragma comment(lib,"hook.lib") L":bI&V?:
#ifdef _DEBUG _P7tnXww
#define new DEBUG_NEW 1S:|3W
#undef THIS_FILE SJ?)%[(T
static char THIS_FILE[] = __FILE__; #VGjCEeU
#endif b]Z@^<_E
#define IDM_SHELL WM_USER+1 A??@AP[7M
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }#`:Qb \U
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @f1*eo5f
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V[;M&=,"
class CAboutDlg : public CDialog y\c"b-lQX
{ ,Zf
9RM
public: o[\HOe~;
CAboutDlg(); p9qKLJ*.C
// Dialog Data $m| V :/
//{{AFX_DATA(CAboutDlg) v;EQ, NL
enum { IDD = IDD_ABOUTBOX }; <a^Oj LLU
//}}AFX_DATA Di5(9]o2
// ClassWizard generated virtual function overrides [A2`]CE<@
//{{AFX_VIRTUAL(CAboutDlg) (Ddp|a"b
protected: .12aUXo(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support </"4 zD|
//}}AFX_VIRTUAL $_;e>*+x
// Implementation 1wj:aD?g
protected: If-_?wZe
//{{AFX_MSG(CAboutDlg) T7*wS#z)h
//}}AFX_MSG !#yq@2QX
DECLARE_MESSAGE_MAP() &1|?BZv
}; K>/%X!RW
\2C`<h$fN
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
_D,
;MB&7
{ NjuiD].
//{{AFX_DATA_INIT(CAboutDlg) R^#@lI~
//}}AFX_DATA_INIT OE`X<h4r
} =aG xg57
-yAQ
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vH[47Cv G5
{ Nw_@A8-r
CDialog::DoDataExchange(pDX); G}d-(X
//{{AFX_DATA_MAP(CAboutDlg) m#!=3P7T
//}}AFX_DATA_MAP YB( Gk;]
} Qdk6Qubi!
v`PY>c6~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *Zk>2<^R
//{{AFX_MSG_MAP(CAboutDlg) :[l\@>H1tX
// No message handlers .Ajzr8P
//}}AFX_MSG_MAP R`8@@}
END_MESSAGE_MAP() Guw}=l--YR
)cJ#-M2
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }_'IE1bA
: CDialog(CCaptureDlg::IDD, pParent) G6 0S|d
{ YwEpy(}hJm
//{{AFX_DATA_INIT(CCaptureDlg) X2sH E
m_bControl = FALSE; 2}6%qgnT-
m_bAlt = FALSE; 1c4/}3*
m_bShift = FALSE;
-fI`3#
m_Path = _T("c:\\"); uN*KHE+h
m_Number = _T("0 picture captured."); BR`ygrfe
nCount=0; JuR"J1MY
bRegistered=FALSE; 9m2, qr|
bTray=FALSE; "ww|&-W9
//}}AFX_DATA_INIT >SF Uy\3
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Bq\F?zk<
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z4%uN|V
} yF}OfK?0f
K7knK
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Kb#4ILA
{ {PP9$>4`l
CDialog::DoDataExchange(pDX); &F:IIo7
//{{AFX_DATA_MAP(CCaptureDlg) {6;9b-a]
DDX_Control(pDX, IDC_KEY, m_Key); h0--B]f@
DDX_Check(pDX, IDC_CONTROL, m_bControl); g,tjm(
DDX_Check(pDX, IDC_ALT, m_bAlt); RcG0 8p.)
DDX_Check(pDX, IDC_SHIFT, m_bShift); 8
;d$54
b
DDX_Text(pDX, IDC_PATH, m_Path); V]OmfPve
DDX_Text(pDX, IDC_NUMBER, m_Number); z<sg0K8z63
//}}AFX_DATA_MAP G'2#9<c*
} K;?,FlH
(s<Dd2&.H
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) k(>h^
//{{AFX_MSG_MAP(CCaptureDlg) #4MBoN(3
ON_WM_SYSCOMMAND() Q)m4_+,d
ON_WM_PAINT() yzw mT
ON_WM_QUERYDRAGICON() nkxzk$
ON_BN_CLICKED(ID_ABOUT, OnAbout) Q?ahr~qo
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) FMNm,O]
ON_BN_CLICKED(ID_CHANGE, OnChange) OaJB=J%
//}}AFX_MSG_MAP 0nn okN^
END_MESSAGE_MAP() @2pu^k^
T{V/+RM
BOOL CCaptureDlg::OnInitDialog() m }a|FS
{ mK+IEZV<3
CDialog::OnInitDialog(); 3!Sp0P
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xq-17HKs
ASSERT(IDM_ABOUTBOX < 0xF000); Qy<[7
CMenu* pSysMenu = GetSystemMenu(FALSE); q)H1pwxD
if (pSysMenu != NULL) R1nJUOE4w^
{ \!(
CString strAboutMenu; 3iw{SEY
strAboutMenu.LoadString(IDS_ABOUTBOX); }I3gU
if (!strAboutMenu.IsEmpty()) #-pc}Y|<
{ mRB
pSysMenu->AppendMenu(MF_SEPARATOR); ]k9)G*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4}_O`Uxh
} `D9]*c
!mO
} 6KD `oUx
SetIcon(m_hIcon, TRUE); // Set big icon T\Uek-(
SetIcon(m_hIcon, FALSE); // Set small icon 91Uj}n%
m_Key.SetCurSel(0); .sQ=;w/ZA
RegisterHotkey(); GN KF&M
CMenu* pMenu=GetSystemMenu(FALSE); $P1O>x>LIL
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); bSVlk`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &/Ro lIHF
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U4 13?Pe
return TRUE; // return TRUE unless you set the focus to a control V9ssH87#
} SQeRSz8bK4
ypJ".
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >A0k 8T
{ P&Pj>!T5
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :4^\3~i1X
{ J8Yd1.Qj
CAboutDlg dlgAbout; o)OUWGjb/K
dlgAbout.DoModal(); GTHkY*
} e</$ s
else Fg Lrb#
{ _fZZ_0\Q
CDialog::OnSysCommand(nID, lParam); WK="J6K5
} w.&1%X(k
} ',GS#~
4t)%<4
void CCaptureDlg::OnPaint() %pXAeeSY`;
{ <C9 XX~
if (IsIconic()) [F5h
{ ""s]zNF}
CPaintDC dc(this); // device context for painting `vc
"Q/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b)9'bJRvU
// Center icon in client rectangle S(\9T1DVe
int cxIcon = GetSystemMetrics(SM_CXICON); z,{<Nm7&F
int cyIcon = GetSystemMetrics(SM_CYICON); Q5%#^ZdsTd
CRect rect; wH~kTU2br
GetClientRect(&rect); " R8KQj
int x = (rect.Width() - cxIcon + 1) / 2; ['%69dPh
int y = (rect.Height() - cyIcon + 1) / 2; xoOJauSX1
// Draw the icon
-Ij&
dc.DrawIcon(x, y, m_hIcon); rHP%0f9:
} V7TVt,-3
else u*qV[y5Bl
{ tgjr&G}a@0
CDialog::OnPaint(); _z[#}d;k
} P ~PIMkt
} o[H{(f1%
%F kMv
HCURSOR CCaptureDlg::OnQueryDragIcon() v\`9;QV5
{ p-+K4
return (HCURSOR) m_hIcon; 8EVgoJ.
} BL 3gKx.'
a,78l@d(
void CCaptureDlg::OnCancel() TNQP"9[?
{ s}pIk.4ot!
if(bTray) D1nq2GwS
DeleteIcon(); w,R[C\#J
CDialog::OnCancel(); P;pl,~
} 2< hAa9y
e[Abp~@M1
void CCaptureDlg::OnAbout() =TqQbadp
{ yjJ5P`j]
CAboutDlg dlg;
^xPmlS;X
dlg.DoModal(); p _d:eZ
} erO>1 ,4S
GWvH[0
void CCaptureDlg::OnBrowse() 9}z0J
{ L. ]$6Q0
CString str; XT;u<aJs
BROWSEINFO bi; o!Rd ^
char name[MAX_PATH]; fvb=#58N_
ZeroMemory(&bi,sizeof(BROWSEINFO)); tl'n->G>v
bi.hwndOwner=GetSafeHwnd(); C{2xHd/*
bi.pszDisplayName=name; m! U9m
bi.lpszTitle="Select folder"; oA1a /[#
bi.ulFlags=BIF_RETURNONLYFSDIRS; w1;hy"zPsj
LPITEMIDLIST idl=SHBrowseForFolder(&bi); )G7=G+e;
if(idl==NULL) :W@#) 1=
return; Kt0(gQOr0
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?'"X"@r5
str.ReleaseBuffer(); 7mm1P9Z
m_Path=str; f-nz{U
if(str.GetAt(str.GetLength()-1)!='\\') Y'e eA 2O
m_Path+="\\"; \p%3vRwS%p
UpdateData(FALSE); sZ?mP;Q
} @,XSs
2 1PFR:lP7
void CCaptureDlg::SaveBmp()
Mkq( T[)
{ ~n}k\s~|4
CDC dc; +{]xtQB=,{
dc.CreateDC("DISPLAY",NULL,NULL,NULL); H~ u[3LQz
CBitmap bm; 6=N`wi
int Width=GetSystemMetrics(SM_CXSCREEN); :rP#I#,7w
int Height=GetSystemMetrics(SM_CYSCREEN); >[6{LAe~hp
bm.CreateCompatibleBitmap(&dc,Width,Height); ?bw4~
CDC tdc; KR"M/#
tdc.CreateCompatibleDC(&dc); ~ H6r.:]
CBitmap*pOld=tdc.SelectObject(&bm); !z{-?o/
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z4 E|Ai
tdc.SelectObject(pOld); id?h >g
BITMAP btm; >hH0Q5aL
bm.GetBitmap(&btm); jmg!Ml
DWORD size=btm.bmWidthBytes*btm.bmHeight; @*
il3h,
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~zHg[X*
BITMAPINFOHEADER bih; >c-fI$]
bih.biBitCount=btm.bmBitsPixel; @xc',I
bih.biClrImportant=0; :R.&`4=X
bih.biClrUsed=0; (RtueEb.~E
bih.biCompression=0; rWh6RYd<T
bih.biHeight=btm.bmHeight; Q?AmOo-a
bih.biPlanes=1; N$[$;Fm:
bih.biSize=sizeof(BITMAPINFOHEADER); lgpW@g
bih.biSizeImage=size; _bD/D!|
bih.biWidth=btm.bmWidth; ~afg)[(
bih.biXPelsPerMeter=0; ddVa.0Z!<
bih.biYPelsPerMeter=0; G^"Vo x4
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KN"S?i]X
static int filecount=0; T;L>P[hNn
CString name; wM_c48|d
name.Format("pict%04d.bmp",filecount++); hXGwP4
name=m_Path+name; /*Qq[C
BITMAPFILEHEADER bfh; *-s,.
F+c
bfh.bfReserved1=bfh.bfReserved2=0; OiDhJ
bfh.bfType=((WORD)('M'<< 8)|'B'); 8>/Q1(q0
bfh.bfSize=54+size; #P#-xz
bfh.bfOffBits=54; 1
y}2+Kk
CFile bf; ! Q<>3xZ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "7>>I D
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +h_ !0dG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wv^rS^~
bf.WriteHuge(lpData,size); 4.RG4Jq
bf.Close(); ~XeFOMq
nCount++; *Ei|fe$sa
} PA w-6;
GlobalFreePtr(lpData); _7DkS}NJs
if(nCount==1) CQ;]J=|<_
m_Number.Format("%d picture captured.",nCount); A8A~!2V
else ;6
+}z~
m_Number.Format("%d pictures captured.",nCount); .Wi{lt
UpdateData(FALSE); a^5^gId5l!
} A[WV'!A,
ceGa([#!\_
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e4FM} z[
{ 1y^K/.5-
if(pMsg -> message == WM_KEYDOWN) )6~1 ^tD
{ d3^OEwe
if(pMsg -> wParam == VK_ESCAPE) rw)kAe31
return TRUE; 0ult7s}
if(pMsg -> wParam == VK_RETURN) '&;yT[
return TRUE; aQ j*KMc
} rwIeqV{:
return CDialog::PreTranslateMessage(pMsg); fA48(0p
} fri0XxF
mW%?>Z1=>d
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 22(*J<
{ BK,sc'b
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l<(Y_PE:
SaveBmp(); ~7!7\i,Y8\
return FALSE; v&FF|)$
} yk2 !8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 97!>%d[0
CMenu pop; z'p:gv]
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l8K5k:XCU3
CMenu*pMenu=pop.GetSubMenu(0); 27ckdyQx
pMenu->SetDefaultItem(ID_EXITICON); X}P$emr7
CPoint pt; KNgH|5Pb
GetCursorPos(&pt); EliTFxp
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Cc?TSZ8[
if(id==ID_EXITICON) \8OO)98'
DeleteIcon(); -)!>M>=s
else if(id==ID_EXIT) Ch
)dLPz@
OnCancel(); .ut{,(5
return FALSE; j<%])
} 2fIRlrA$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (eCFWmO
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) bU 63X={
AddIcon(); !2:3MbtR
return res; iAMtejw
} }G$]LWgQx
yz+, gLY
void CCaptureDlg::AddIcon() ~#\i!I;RY}
{ 6pE :A@
NOTIFYICONDATA data; ^0W(hA
data.cbSize=sizeof(NOTIFYICONDATA); 52zGJ I*
CString tip; zm9TvoC%}
tip.LoadString(IDS_ICONTIP); CBf7]n0H
data.hIcon=GetIcon(0); CLKov\U\
data.hWnd=GetSafeHwnd(); CGw--`#\
strcpy(data.szTip,tip); pO<-.,
data.uCallbackMessage=IDM_SHELL; 6) \dBOz
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !0/z>#b
data.uID=98; }W)=@t
Shell_NotifyIcon(NIM_ADD,&data); Q Z8QQ`*S
ShowWindow(SW_HIDE); 6)]f6p&e
bTray=TRUE; gJ2
H=#M
}
(kTXP_
64Gi8|P
void CCaptureDlg::DeleteIcon() 1-I
Swd'u
{ *5%*|>
NOTIFYICONDATA data; D}Ilyk_uUw
data.cbSize=sizeof(NOTIFYICONDATA); F="z]C;u
data.hWnd=GetSafeHwnd(); V%HS\<$h
data.uID=98; 'k&?DZ!
Shell_NotifyIcon(NIM_DELETE,&data); gM;}#>6
ShowWindow(SW_SHOW); XM
Vq-8B0
SetForegroundWindow(); [AEBF2OIv
ShowWindow(SW_SHOWNORMAL); TY;U2.Ud
bTray=FALSE; NCA{H^CL
} -U2mfW
sPNfbCOz
void CCaptureDlg::OnChange() (g :p5Rl
{ +V v+K(lh$
RegisterHotkey(); dTEJ=d40
} F>|9 52
{gf>*
BOOL CCaptureDlg::RegisterHotkey() Mj0Cat=
{ d&:H&o)T!
UpdateData(); >Pe:I
UCHAR mask=0; P#GD?FUc
UCHAR key=0; AZFWuPJo
if(m_bControl) >e5zrgV
mask|=4; Q 882B1H
if(m_bAlt) r
-f
mask|=2; 0rMqWP
if(m_bShift) .")b?#K
mask|=1; o%(bQV-T
key=Key_Table[m_Key.GetCurSel()]; /L)
9tt.
if(bRegistered){ MQcE6)
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5{>0eFzG
bRegistered=FALSE; 0yof u
} L9IGK<
cMask=mask; ~] =?b)B
cKey=key; ||TtNH
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [h}K$q
return bRegistered; vW.%[]
} %u]6KrG18b
#t71U a
四、小结 EHf)^]Z
sV0Z
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。