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:
I Z*)
"L`BuAB 一、实现方法
2xiE#l-V2 iOCs%J 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:
p:$kX9mT& 8z7eL>) #pragma data_seg("shareddata")
{dP6fr1z HHOOK hHook =NULL; //钩子句柄
#G?#ot2o UINT nHookCount =0; //挂接的程序数目
BNA1"@9q static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
g.blDOmlc static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
vJct)i static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
M;'GnGFf static int KeyCount =0;
|,S]EHIy static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
W1Fhx` #pragma data_seg()
2A =Y ,UC|[-J 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。
K>LS8,8V ?~T(Cue> 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!x;w7j #`U?,>2q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
T-GvPl9ZJw cKey,UCHAR cMask)
0%;| B {
Anpp`>}N BOOL bAdded=FALSE;
yS:w>xU @< for(int index=0;index<MAX_KEY;index++){
( xzruI5P if(hCallWnd[index]==0){
T][c^K* hCallWnd[index]=hWnd;
OC-d5P
HotKey[index]=cKey;
^_V0irv HotKeyMask[index]=cMask;
[McH l1a bAdded=TRUE;
iRca c[uV KeyCount++;
#Tag"b` break;
xXI WEZA }
]9'F<T= $_ }
Pg`+Q^^6S return bAdded;
Y*Ay=@z=y }
;14Q@yrZ0 //删除热键
nRw.82eK. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
O'^AbO=, {
lX/7 BOOL bRemoved=FALSE;
B-L@ 0gH for(int index=0;index<MAX_KEY;index++){
'qo(GGC M if(hCallWnd[index]==hWnd){
n ~ &ssFC if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[;
$:Lr hCallWnd[index]=NULL;
y?3u6q++ HotKey[index]=0;
)k[XO HotKeyMask[index]=0;
W>?aZv bRemoved=TRUE;
UUtSme KeyCount--;
qzHsqlof break;
.#a7?LUH }
QkTU@T6>o }
+!`$( }
LV0gw" return bRemoved;
<&B]p }
C R't $ntC{a>& eYjF"Aq DLL中的钩子函数如下:
?vF8 y;Jh i!JSEQ_8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
)[&j&AI {
/Jc^XWf BOOL bProcessed=FALSE;
zH~g5xgh if(HC_ACTION==nCode)
"
;8kKR {
LS#_K- if((lParam&0xc0000000)==0xc0000000){// 有键松开
s-&i!d switch(wParam)
QZO<'q`L {
eISHV.QV case VK_MENU:
lD_iIe~c MaskBits&=~ALTBIT;
xs"\c7pC break;
*l0i}"T^_ case VK_CONTROL:
>%_i#|dE> MaskBits&=~CTRLBIT;
f_hG2Sk break;
eB,@oo% case VK_SHIFT:
t)(>E'X
x MaskBits&=~SHIFTBIT;
Ur""&@ break;
+K;%sAZy default: //judge the key and send message
`sRys oW break;
Z yz)`>cB }
{w99~? for(int index=0;index<MAX_KEY;index++){
1JI7P?\B if(hCallWnd[index]==NULL)
vDc&m continue;
Fy_~~nI0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=_2(S 6~ {
)hK;27m4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IueI7A bProcessed=TRUE;
f-}_ }
g%4=T~ }
)f%Q7 }
-N2m|%B else if((lParam&0xc000ffff)==1){ //有键按下
6". v6 switch(wParam)
P$`k*
v {
l W
Lj== case VK_MENU:
elP#s5l4 MaskBits|=ALTBIT;
}iB>3|\ break;
M;@/697G case VK_CONTROL:
TiI3<.a! MaskBits|=CTRLBIT;
\Q,5Ne'o break;
(G{2ec:? case VK_SHIFT:
? ~_h3bHH MaskBits|=SHIFTBIT;
[>kzQYT[ break;
:HN\A4=kc( default: //judge the key and send message
.OF2O} break;
Mj |"+( }
-/6Ms%O for(int index=0;index<MAX_KEY;index++){
{_J1m&/ if(hCallWnd[index]==NULL)
Y2y =
P continue;
JB!KOzw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=Xb:. {
|DoD.?v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
dxWG+S bProcessed=TRUE;
a[V4EX1E }
TbhsOf! }
6C*4' P9> }
eP|hxqM&9 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+}!FP3KgT for(int index=0;index<MAX_KEY;index++){
#TY[\$BHs if(hCallWnd[index]==NULL)
\F),SL continue;
CLY>M`%?+p if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zzyD'n7D SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
uB3Yl=P //lParam的意义可看MSDN中WM_KEYDOWN部分
.?-]+-J?` }
::G0v }
>]l7AZ:, }
EcmyY,w return CallNextHookEx( hHook, nCode, wParam, lParam );
QU^?a~r }
Q!}LtR$ H-Or 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:
{DGnh1 CK RnkTTiV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
83YQ c BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Je;HAhL zRF+D+ 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:
ao)8ie X0gWTs LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
HpTX6}^ {
&$E.rgtg if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Sc3 B*. {
&dI;o$t //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?$rHyI SaveBmp();
+^@6{1 return FALSE;
u}IQ)Ma }
BpZ17"\z …… //其它处理及默认处理
!mRDzr7 }
N"o+;yR v?(9ZY] ^G]H9qY-e 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
cvl1X" /2e,,)4g 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
LuW^Ga"E ?>o|H-R~5Z 二、编程步骤
b&Go'C{p / :@X< 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
F
{T\UX 2XGbqZj 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
{oc7Chv=/H 0ud>oh4WPR 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
?e+$?8l[3 S k&l8" 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;
dX:#KdK @Tg +Kt 5、 添加代码,编译运行程序。
`SSUQ#@ /C)FS?=
三、程序代码
JqYt^,,Q: PFnq:G^L ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
^L;k #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
9,zM.g9Qv #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5!)_"u3 #if _MSC_VER > 1000
=)Q0=!%- #pragma once
mMRdnf!Uid #endif // _MSC_VER > 1000
=3?"s(9 #ifndef __AFXWIN_H__
@ag*zl #error include 'stdafx.h' before including this file for PCH
fnm:Wa|,%| #endif
trC+Etc #include "resource.h" // main symbols
}8cX0mZ1j class CHookApp : public CWinApp
PC}m.tE {
SQd`xbIuL public:
iNAaTU CHookApp();
HfgK0wIi // Overrides
Bpw<{U // ClassWizard generated virtual function overrides
,"W.A //{{AFX_VIRTUAL(CHookApp)
X}gnO83 public:
4C{3>BE virtual BOOL InitInstance();
edy6WzxBcm virtual int ExitInstance();
oPA
[vY //}}AFX_VIRTUAL
fCxF3m(O //{{AFX_MSG(CHookApp)
*PVv=SU // NOTE - the ClassWizard will add and remove member functions here.
+w
pe<T // DO NOT EDIT what you see in these blocks of generated code !
dECH/vJ^ //}}AFX_MSG
HGjGV]N5 DECLARE_MESSAGE_MAP()
:'LG%E:b };
=wy 3h0k^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
^."HD( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
c_r&)8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/Aq):T T BOOL InitHotkey();
{?dW- BOOL UnInit();
`i)&nW)R #endif
|ozlaj uJ! yM;{+ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
wzRIvm{ #include "stdafx.h"
Q5s?/r #include "hook.h"
9w! G #include <windowsx.h>
S(f V ,;Z #ifdef _DEBUG
8?7gyp!k_f #define new DEBUG_NEW
:>t?^r( #undef THIS_FILE
]'/ZSy, static char THIS_FILE[] = __FILE__;
~t~5ctJ@ #endif
mrfc.{`[
#define MAX_KEY 100
>%D=#}8l@ #define CTRLBIT 0x04
An%V>a-[ #define ALTBIT 0x02
~?c}=XL- #define SHIFTBIT 0x01
UUt631 #pragma data_seg("shareddata")
p3NTI /- HHOOK hHook =NULL;
-)Y?1w UINT nHookCount =0;
%Jpb&CEY static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
=!`\=!y static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
>5jHgs# static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[}OL@num static int KeyCount =0;
;#$zHR static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
92k}ON #pragma data_seg()
-~HlME*~f HINSTANCE hins;
[[[QBplJ void VerifyWindow();
{:3XP<hqN BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
`f2m5qTP% //{{AFX_MSG_MAP(CHookApp)
U "qO&;m // NOTE - the ClassWizard will add and remove mapping macros here.
]PnE% // DO NOT EDIT what you see in these blocks of generated code!
:-f"+v //}}AFX_MSG_MAP
'7<@(HO END_MESSAGE_MAP()
,Wp0,>! !\NKu1ta CHookApp::CHookApp()
M]>JI'8 {
N
-]m <z> // TODO: add construction code here,
y{eZrX| // Place all significant initialization in InitInstance
e<p_u)m }
S %"7`xl )pVxp]EI CHookApp theApp;
iK"j@1| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`f^`i~c\ {
n]B)\D+V^ BOOL bProcessed=FALSE;
sv^;nOAc if(HC_ACTION==nCode)
mP)<;gm, {
pr-{/6j6 if((lParam&0xc0000000)==0xc0000000){// Key up
QsmG(1= switch(wParam)
L#e|t0'# {
.~5cNu'#m case VK_MENU:
K6,5C0 MaskBits&=~ALTBIT;
Mdh(Mp(w break;
_OF8D case VK_CONTROL:
2#Au6BvX MaskBits&=~CTRLBIT;
~X;(m<f2 break;
#oYX0wvl case VK_SHIFT:
nDvny0^a MaskBits&=~SHIFTBIT;
>NwrJSx break;
u%O^hcfb default: //judge the key and send message
fxLhVJ"b break;
`,(1' }
%;9eh' for(int index=0;index<MAX_KEY;index++){
ZUyM:$ if(hCallWnd[index]==NULL)
&-+&`h|s continue;
|k'I?:' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jkNZv. )p {
WII_s|YSt% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0 EXAdRR bProcessed=TRUE;
mId{f }
[,5clR=F }
"VWxHRVg4M }
q<JI!n1O else if((lParam&0xc000ffff)==1){ //Key down
/$rS0@p switch(wParam)
(6\A"jey\x {
qc\o>$-:` case VK_MENU:
B>47Ic MaskBits|=ALTBIT;
?=IbiT break;
:B- ,*@EU case VK_CONTROL:
q0y?$XS MaskBits|=CTRLBIT;
q@(N 38D break;
TF^]^XS' case VK_SHIFT:
]-.Q9cjc$q MaskBits|=SHIFTBIT;
nbpN+a% break;
of& vQ default: //judge the key and send message
,iPkx( break;
kd\G> }
`hlyN]L for(int index=0;index<MAX_KEY;index++)
C-6+ZIk4 {
9I RE@c if(hCallWnd[index]==NULL)
iCx'`^HnP continue;
{8jG6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T
|j^ {
k LD)<D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
q>omCk%h bProcessed=TRUE;
nMc-kyl{ }
[1vrv(u> }
&P{%C5?{ }
8'cD K[L if(!bProcessed){
oW+R:2I~O for(int index=0;index<MAX_KEY;index++){
orU4{.e if(hCallWnd[index]==NULL)
Hh@mIusj continue;
rfPJBD{Ve if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
E>V8|Hz; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ta[}k/zW }
L,kF] }
N]=.I }
aVtwpkgZ return CallNextHookEx( hHook, nCode, wParam, lParam );
OQsH,' }
1%=,J'AH )US)-\^ BOOL InitHotkey()
a,tP.Xsl {
gh
0\9;h if(hHook!=NULL){
T@S+5( nHookCount++;
7PvuKAv?k return TRUE;
,,iQG' * }
g{ a0,B/j else
W.CIyGK hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
:D/R if(hHook!=NULL)
FQ 4rA 4 nHookCount++;
3~S~)quwP return (hHook!=NULL);
@O(\TIg }
7vWB=r>5@ BOOL UnInit()
FJ[(dGKeE {
[p(C:rH if(nHookCount>1){
qj/P4 *6E nHookCount--;
/;>EyWW return TRUE;
lk'RWy"pw }
Ar$LA"vu4 BOOL unhooked = UnhookWindowsHookEx(hHook);
l%:_#1?isf if(unhooked==TRUE){
}l2JXf55 nHookCount=0;
]Lh\[@#1f hHook=NULL;
X3>(K1 }
r9U1 O@c return unhooked;
uJ$"2<O }
aD:+,MZ XU54skN BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
n#R!`*[ {
+l#2u#e BOOL bAdded=FALSE;
G@;aqe[dB for(int index=0;index<MAX_KEY;index++){
Mu%'cwp$ if(hCallWnd[index]==0){
8,=$>@u hCallWnd[index]=hWnd;
o]j* HotKey[index]=cKey;
$OO[C={v[ HotKeyMask[index]=cMask;
ppYz~ {"r bAdded=TRUE;
Il642#Gh KeyCount++;
D'&LwU,o break;
(AS%P? }
4>W`XH }
MoA{ /{ return bAdded;
e'`oisJU?q }
Y `{U45 q}!4b'z^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6IX!9I\sT {
7-dwr?j7 BOOL bRemoved=FALSE;
BAhC-;B#R for(int index=0;index<MAX_KEY;index++){
M Q6Y^,B if(hCallWnd[index]==hWnd){
,y >Na{@Y if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@K/Ia!Lw hCallWnd[index]=NULL;
YJy*OS_& HotKey[index]=0;
9NT;^K^I HotKeyMask[index]=0;
=
` ^jz} bRemoved=TRUE;
LWI~m2 KeyCount--;
1mX*0> break;
DHAWUS6 }
W)#`4a^xj7 }
qkIU>b,B }
u!i5Q return bRemoved;
nqBuC }
cC4T3]4l' @K9T )p] void VerifyWindow()
R+K[/AA {
c&++[ for(int i=0;i<MAX_KEY;i++){
- -G1H if(hCallWnd
!=NULL){ ?@1'WD t
if(!IsWindow(hCallWnd)){ nR7\ o(!
hCallWnd=NULL; wLtTC4D
HotKey=0; ca=e_sg
HotKeyMask=0; (5> ibe
KeyCount--; Ro<kp8
} q}5A^QX
} K(gj6SrjV
} V5B-S.i@
} o(P:f)B
Nj0)/)<r+
BOOL CHookApp::InitInstance() =@2V#X]M*
{ _
^{Ep/ME=
AFX_MANAGE_STATE(AfxGetStaticModuleState()); [R4x[36Zp
hins=AfxGetInstanceHandle();
qR qy
InitHotkey(); S F>D:$a
return CWinApp::InitInstance(); C t)MvZ
} CWp1)%0=
W[Bu&?h$
int CHookApp::ExitInstance() %K"%Qm=Tl
{ CeTr%j
VerifyWindow(); G+uiZ(p>
UnInit(); [.X%:H+
return CWinApp::ExitInstance(); &._!)al
} }&DB5M
%v[Kk-d
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hZ<btN.y5
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vC:b?0s #(
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d|]O<]CG_
#if _MSC_VER > 1000 4_+Pv6
#pragma once [+g@@\X4
#endif // _MSC_VER > 1000 }4SSo)Uv/
jJZsBOW[8
class CCaptureDlg : public CDialog pFTlhj)1
{ 7Zt\G-QV
// Construction lGUV(D
public: R*Z]
BOOL bTray; AwUc{h l<
BOOL bRegistered; >&QH{!(
BOOL RegisterHotkey(); PuCDsojclh
UCHAR cKey; *ldMr{s<R
UCHAR cMask; vQ"s
void DeleteIcon(); KC:4
void AddIcon();
YX`=M
UINT nCount; O}_a3>1DY
void SaveBmp(); _AYC|R|
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]"Y%M'
// Dialog Data ~9r!m5ws
//{{AFX_DATA(CCaptureDlg) [!@oRK=~
enum { IDD = IDD_CAPTURE_DIALOG }; >}b6J7_
CComboBox m_Key; MJ,ZXJXs
BOOL m_bControl; {Y91vXTz7
BOOL m_bAlt; T_?nd T2
BOOL m_bShift; .3<IOtD=
CString m_Path; .l+~)$
CString m_Number; ZuvPDW%
//}}AFX_DATA $[iT~B$
// ClassWizard generated virtual function overrides dAr)%RZ
//{{AFX_VIRTUAL(CCaptureDlg) ZQ~myqx,+L
public: R
pI<]1
virtual BOOL PreTranslateMessage(MSG* pMsg); {Mr~%y4
protected: [OZ=iz.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C`n9/[,#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); F|?'9s*;6G
//}}AFX_VIRTUAL F`0c?)
// Implementation +K%pxuVh
protected: f{Fe+iPc
HICON m_hIcon; qC1U&b#MVx
// Generated message map functions ;DD>k bd
//{{AFX_MSG(CCaptureDlg) /Pn.)Lxfl
virtual BOOL OnInitDialog(); sQ}%7BMK
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3`k[!!
afx_msg void OnPaint(); 8.CKH4h
afx_msg HCURSOR OnQueryDragIcon(); yYToiW *
virtual void OnCancel(); ')5L_$
afx_msg void OnAbout(); #_?TIY:h
afx_msg void OnBrowse(); jefNiEE[
afx_msg void OnChange(); z0 2}&^Zzk
//}}AFX_MSG H5Ux.]y
DECLARE_MESSAGE_MAP() 8Y\OCwO
}; kxm:g)`=[
#endif IAP/G5'Q
O:;OR'N9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o)tKH@`vE
#include "stdafx.h" q*[!>\Z8
#include "Capture.h" ]D LZ&5pv
#include "CaptureDlg.h" K
lli$40
#include <windowsx.h> K[uY+!'1
#pragma comment(lib,"hook.lib") j9URl$T:
#ifdef _DEBUG X<~k =qwA
#define new DEBUG_NEW N^h|h
#undef THIS_FILE SqXy;S@
static char THIS_FILE[] = __FILE__; <E>7>ZL
#endif K/vxzHSl
#define IDM_SHELL WM_USER+1 eC6>yD6D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m7r j>X Y
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GS
;HtUQ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -uA 3Y
class CAboutDlg : public CDialog #y=ZP:{:t
{ |*^8~u3J"
public: @up&q
CAboutDlg(); ;w`sz.
// Dialog Data I %|@3=Yc
//{{AFX_DATA(CAboutDlg) 9ZDVy7m\i-
enum { IDD = IDD_ABOUTBOX }; nnt8 sf@\
//}}AFX_DATA #K=b%;>
// ClassWizard generated virtual function overrides c ]>DI&$;J
//{{AFX_VIRTUAL(CAboutDlg) {y,nFxLq
protected: XkPv*%Er8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8P,l>HA
//}}AFX_VIRTUAL F:M>z=
// Implementation 2E$^_YT
C
protected: 5>k>L*5J
//{{AFX_MSG(CAboutDlg) )]%e
//}}AFX_MSG [34zh="o
DECLARE_MESSAGE_MAP() :KEq<fEI
}; 3A-*vaySV
sYGR-:K
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a9[mZVMgUK
{ gUl1CH&
//{{AFX_DATA_INIT(CAboutDlg) `-VG ?J
//}}AFX_DATA_INIT NW
z9C=y
} :qxm !P
B@-|b
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;0IvF#SJ(.
{ Le*`r2
CDialog::DoDataExchange(pDX); .iFViVZC
//{{AFX_DATA_MAP(CAboutDlg) 5XDgs|8
//}}AFX_DATA_MAP -*?p F_*w
} 'X9AG6K1
E W`W~h[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K[kds`
//{{AFX_MSG_MAP(CAboutDlg)
6DB0ni
// No message handlers 7 0_}S*T
//}}AFX_MSG_MAP '=VH6@vZ_'
END_MESSAGE_MAP() z&O#v9.NE|
%NNj9Bl<VV
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^w.]Hd2
: CDialog(CCaptureDlg::IDD, pParent) 7%e1cI
{ Uo~T'mA"
//{{AFX_DATA_INIT(CCaptureDlg) kd yAl,
m_bControl = FALSE; mjbTy"}"
m_bAlt = FALSE; xA92C
m_bShift = FALSE; 6,X+1EXY
m_Path = _T("c:\\"); 'xIyGDe
m_Number = _T("0 picture captured."); cS4DN
nCount=0; x|8^i6xB
bRegistered=FALSE; .46#`4av
bTray=FALSE; vv+km +
//}}AFX_DATA_INIT }MP>]8Aq
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]Ko^G_Rm
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )IHG6}<
} ["u#{>(X
58: :h.:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~(P&g7u
{ 09'oz*v{#
CDialog::DoDataExchange(pDX); 30s; }
//{{AFX_DATA_MAP(CCaptureDlg) D93gH1z
DDX_Control(pDX, IDC_KEY, m_Key); =J](.78
DDX_Check(pDX, IDC_CONTROL, m_bControl); Q^L)
Vp"
DDX_Check(pDX, IDC_ALT, m_bAlt); 3f"C!l]Xu
DDX_Check(pDX, IDC_SHIFT, m_bShift); +
~"5!
DDX_Text(pDX, IDC_PATH, m_Path); \/ErPi=g
DDX_Text(pDX, IDC_NUMBER, m_Number); AotCX7T2T
//}}AFX_DATA_MAP #.H}r6jqs
} X3<K 1/<
P;73Hr[E#
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h$>wv`
//{{AFX_MSG_MAP(CCaptureDlg) onwjn+"&
ON_WM_SYSCOMMAND() l-<`m#/v
ON_WM_PAINT() Sm)u9
ON_WM_QUERYDRAGICON() V7EQ4Om:It
ON_BN_CLICKED(ID_ABOUT, OnAbout) TN\|fzj
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KFU%DU G
ON_BN_CLICKED(ID_CHANGE, OnChange) TkRmV6'w
//}}AFX_MSG_MAP ziiwxx_
END_MESSAGE_MAP() \9`#]#1bx5
-\4zwIH
BOOL CCaptureDlg::OnInitDialog() Br!9x{q*
{ k2r3dO@q
CDialog::OnInitDialog(); Q,gLi\siI
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4jX3lq|
ASSERT(IDM_ABOUTBOX < 0xF000); /,2rjJ#b
CMenu* pSysMenu = GetSystemMenu(FALSE); z8"7u/4v{
if (pSysMenu != NULL) .fp&MgiQ
{ I`T1Pll
CString strAboutMenu; XRxj W
strAboutMenu.LoadString(IDS_ABOUTBOX); Wpr
,jN8b
if (!strAboutMenu.IsEmpty()) BEUK}T K4
{ BRzfic:e
pSysMenu->AppendMenu(MF_SEPARATOR); :5b0np!
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); GSi>l,y'
} j/KO|iNL2
} 6@V~0DG
SetIcon(m_hIcon, TRUE); // Set big icon /&^W#U$4
SetIcon(m_hIcon, FALSE); // Set small icon "g0(I8
m_Key.SetCurSel(0); cE\>f8 I
RegisterHotkey(); g<wRN#B
CMenu* pMenu=GetSystemMenu(FALSE); <CZgQ\Mt
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wNYg$d0M
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T^:fn-S}=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); > 'i
return TRUE; // return TRUE unless you set the focus to a control ok{!+VCB5
} %%JMb=!%2
fQdK]rLj
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Zsx3/}
{ GpI!J}~m
if ((nID & 0xFFF0) == IDM_ABOUTBOX) b~w=v_[(I
{ iM]o"qOQm
CAboutDlg dlgAbout; _>yoX
dlgAbout.DoModal(); (Un_!)
} 'e!J06
else _S`o1^Ad
{ .iHn5SGA
CDialog::OnSysCommand(nID, lParam); ._PzYE|m2
} :O= \<t
} :j^FJ@2_
`5~3G2T
void CCaptureDlg::OnPaint() AUe# RP
{ n6<V+G)T
if (IsIconic()) .(CP. d
{ {{yZ@>o6
CPaintDC dc(this); // device context for painting Zd:Taieh@
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `bjizS'^
// Center icon in client rectangle bm% $86
int cxIcon = GetSystemMetrics(SM_CXICON); x[3A+
int cyIcon = GetSystemMetrics(SM_CYICON); DA&?e~L&H
CRect rect; m3<+yz$!r
GetClientRect(&rect); 36.N>G,
int x = (rect.Width() - cxIcon + 1) / 2; Iw<i@=V
int y = (rect.Height() - cyIcon + 1) / 2; C3NdE_E
// Draw the icon ^-z=`>SrS"
dc.DrawIcon(x, y, m_hIcon); VVP:w%yW
} ]X Z-o>+,
else {gbn/{
{ 7R!5,Js+
CDialog::OnPaint(); ={>Lrig:l
} svf|\p>]H
} ,\2:/>2
M-V&X&?j
HCURSOR CCaptureDlg::OnQueryDragIcon() 9o*,P,j'}
{ D,qu-k[jMI
return (HCURSOR) m_hIcon; >9e(.6&2XZ
} 1K,1X(0rL8
}v:jncp
void CCaptureDlg::OnCancel() .
\
{ kVK/9dy-F
if(bTray) 2_vbT!_
DeleteIcon(); U8qtwA9t
CDialog::OnCancel(); evkH05+;W
} w}Uhd,
+6wiOHB`
void CCaptureDlg::OnAbout() Wjhvxk
{ &nBa=Enf
CAboutDlg dlg;
9$`lIy@B
dlg.DoModal(); H"ZZ.^"5FV
} *HEuorl
>D201&*G%
void CCaptureDlg::OnBrowse() L|bwZ,M=}?
{ q[`j`8YY!R
CString str; fd-q3_f
BROWSEINFO bi; OO[F E3F
char name[MAX_PATH]; -'~LjA(
ZeroMemory(&bi,sizeof(BROWSEINFO)); <! )**
bi.hwndOwner=GetSafeHwnd(); M%jPH
bi.pszDisplayName=name; Y"A/^]
bi.lpszTitle="Select folder"; UfS%71l.$
bi.ulFlags=BIF_RETURNONLYFSDIRS; p+)Y Tzzc
LPITEMIDLIST idl=SHBrowseForFolder(&bi); #9K-7je;j
if(idl==NULL) ME'|saP
return; _6ay-u
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RV@*c4KvO+
str.ReleaseBuffer(); lz1wO5%h
m_Path=str; "*G.EiLq
if(str.GetAt(str.GetLength()-1)!='\\') mZd ,
9
m_Path+="\\"; Kq i4hK
UpdateData(FALSE); AU2i%Q!
} cM&{+el
E[Cb|E
void CCaptureDlg::SaveBmp() |4'Y/re
{ YnLErJ
CDC dc; \hCH>*x<
dc.CreateDC("DISPLAY",NULL,NULL,NULL); +TXX$)3%
CBitmap bm; K tNY_&xd
int Width=GetSystemMetrics(SM_CXSCREEN); )7h$G-fe
int Height=GetSystemMetrics(SM_CYSCREEN); rRFhGQq1m
bm.CreateCompatibleBitmap(&dc,Width,Height); D_vbSF)
CDC tdc; B(M6@1m_
tdc.CreateCompatibleDC(&dc); ..rOsg{
CBitmap*pOld=tdc.SelectObject(&bm);
"~'b
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g) -bW+]q
tdc.SelectObject(pOld); _3ZYtmn.
BITMAP btm; >$4d7.^hb/
bm.GetBitmap(&btm); !"Oh36
DWORD size=btm.bmWidthBytes*btm.bmHeight; :0h_K
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G37U6PuZi
BITMAPINFOHEADER bih; `]%|f
bih.biBitCount=btm.bmBitsPixel; i>(e}<i
bih.biClrImportant=0; wiiCd
bih.biClrUsed=0; ti#7(^j
bih.biCompression=0; -\C!I
bih.biHeight=btm.bmHeight; i-6Z"b{
bih.biPlanes=1; I'LnI*
bih.biSize=sizeof(BITMAPINFOHEADER); 1')%`~
bih.biSizeImage=size; '3g[]M@M
bih.biWidth=btm.bmWidth; "s{5O>
bih.biXPelsPerMeter=0; <u2 }i<#
bih.biYPelsPerMeter=0; NU0g07"
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); '*3h!lW1.
static int filecount=0; kBffF@{
CString name; j:VbrR
name.Format("pict%04d.bmp",filecount++); b9l;a+]d
name=m_Path+name; fZoHf\B]{
BITMAPFILEHEADER bfh; ^0 -:G6H
bfh.bfReserved1=bfh.bfReserved2=0; :5{wf Am
bfh.bfType=((WORD)('M'<< 8)|'B'); _fKou2$yz
bfh.bfSize=54+size; MjU6/pO}L
bfh.bfOffBits=54; _ jsK}- \
CFile bf; .hifsB~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Om5Y|v"*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s=;uc]9g
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u?}(P_9
bf.WriteHuge(lpData,size); b}"N`,0dO
bf.Close(); }|pwz
nCount++; R#I0|;q4|p
} 5rU[Tir
GlobalFreePtr(lpData); OOo3G~2r
if(nCount==1) #~
)IJ
m_Number.Format("%d picture captured.",nCount); V{!J-nO
else *+#8mA(
m_Number.Format("%d pictures captured.",nCount); ,=[?yJy
UpdateData(FALSE); `9BROZnq
} o6uJyCO
~GZY 5HF
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ):[7E(F=
{ o{y9r{~A
if(pMsg -> message == WM_KEYDOWN) z62;cv
{ j3{D^|0bP
if(pMsg -> wParam == VK_ESCAPE) yjF1}SQ
return TRUE; 7Mg=b%IYs
if(pMsg -> wParam == VK_RETURN) ci?qT,&
return TRUE; 0|{u{w@!`
}
@fl-3q
return CDialog::PreTranslateMessage(pMsg); ~
Q. 7VDz
} xwq+j "
=ACVE;L?
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 24z< gO
{ &tg&5_
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FG.em
SaveBmp(); F9,DrB,B{
return FALSE; ,Y/ g2
4R
} !:q/Ye3.
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,X`)ct
CMenu pop; 6">+
~
G
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,g2ij
CMenu*pMenu=pop.GetSubMenu(0); xLK<W"%0
pMenu->SetDefaultItem(ID_EXITICON); V3^&oe%
CPoint pt; ,F,X
,
GetCursorPos(&pt); m}7iTDJR9
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hhCrUn"
if(id==ID_EXITICON)
EK6:~
DeleteIcon(); Bu#VMkchJ
else if(id==ID_EXIT) wAf\|{Vn
OnCancel(); qVH1}9_
return FALSE; .\)U@L~
} &m-PC(W+
LRESULT res= CDialog::WindowProc(message, wParam, lParam); E87Ww,z8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tMf}
AddIcon(); 3=aQG'B
return res; MygfT[_
} jIC_[
%C|n9*
void CCaptureDlg::AddIcon() '"SEw
w
{ l`#4KCL(
NOTIFYICONDATA data; pKpUXfQu
data.cbSize=sizeof(NOTIFYICONDATA); X-K=!pET
CString tip; wn/_}]T
tip.LoadString(IDS_ICONTIP); M
l Jo`d
data.hIcon=GetIcon(0); g?z/2zKR
data.hWnd=GetSafeHwnd(); 1v.c 6~
strcpy(data.szTip,tip); Rwz0poG`WG
data.uCallbackMessage=IDM_SHELL; *U&0<{|T
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :~Wrf8UQ
data.uID=98; L^@'q6*}
Shell_NotifyIcon(NIM_ADD,&data); oX30VfT
ShowWindow(SW_HIDE); 5z7U1:
bTray=TRUE; gOSJM1Mr3
} ME46V6[LX]
=P't(<
void CCaptureDlg::DeleteIcon() zv0l,-o
{ Yc_8r+;(
NOTIFYICONDATA data; p<2L.\6"
data.cbSize=sizeof(NOTIFYICONDATA); ,,%i;
data.hWnd=GetSafeHwnd(); gQ Fjr_IS#
data.uID=98; 7%Gwc?[x
Shell_NotifyIcon(NIM_DELETE,&data); Xg|B \\
ShowWindow(SW_SHOW); J:CXW%\ <q
SetForegroundWindow(); 1OCeN%4]Qk
ShowWindow(SW_SHOWNORMAL); o<BOYrS
bTray=FALSE; ?!A7rb/tj
} YIoQL}pX
Z}mLLf E
void CCaptureDlg::OnChange() #U!
_U+K
{ ,(d)Qg
RegisterHotkey(); Wbr|_W
} !t$'AoVBq
r`W)0oxD
BOOL CCaptureDlg::RegisterHotkey() EofymAi%
{ >,gg5<F-E
UpdateData(); x@P y>f2
UCHAR mask=0; $PTP/^
UCHAR key=0; m0ER@BXRn
if(m_bControl) {o_X`rgrL
mask|=4; _=_Px@<Q
if(m_bAlt) ,k )w6)
mask|=2; U}yW<#$+
if(m_bShift) I`-8Air5f
mask|=1; 5na~@-9p
key=Key_Table[m_Key.GetCurSel()]; Uc7mOa}4
if(bRegistered){ S?1AFI9{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); xST8|H
bRegistered=FALSE; 5D\f8L
} ?pr9f5
cMask=mask; IUE~_7
cKey=key; j9eTCJqB
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -+(jq>t
return bRegistered; [#-b8Cu
} @L<*9sLWh
7Ri46Tkt
四、小结 Xe6w|
~
{E'@MU
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。