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:
4@0y$Dv\
Oc A;+}> 一、实现方法
BeFCt; 9\f%+?p 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
pT ]: TRPS 'Sk-L
5 #pragma data_seg("shareddata")
z"D'rHxy HHOOK hHook =NULL; //钩子句柄
Lgr(j60s UINT nHookCount =0; //挂接的程序数目
;fiH=_{us static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
9IfeaoZZ4q static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
so=Ux2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
KcPI,.4{ static int KeyCount =0;
Cg#@JuwHa static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
T'8d|$X #pragma data_seg()
85gdmla@9 ';,Rq9-' 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。
,;%F\<b )b\89F 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:
0*y|k1 I)s~kA.e BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
KdN+$fe*g cKey,UCHAR cMask)
v2K6y|6, {
0vYHx V BOOL bAdded=FALSE;
MeCHn2zwB for(int index=0;index<MAX_KEY;index++){
3+~m 9:9 if(hCallWnd[index]==0){
L>@:Xo@ hCallWnd[index]=hWnd;
Fx!NRY_ HotKey[index]=cKey;
g._`"c HotKeyMask[index]=cMask;
&[#iM0;)W0 bAdded=TRUE;
9lU"m_
QT4 KeyCount++;
&GKtD) break;
V =9 }
jt5:rWB }
a|Yry return bAdded;
CQ;.}=j
, }
|g)/6jG<- //删除热键
;nx? 4f+6h BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
DWXxB {
rP%B#%;S" BOOL bRemoved=FALSE;
sR;^7(f!m for(int index=0;index<MAX_KEY;index++){
3OZu v};k if(hCallWnd[index]==hWnd){
/k_?S? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
md
S`nhb hCallWnd[index]=NULL;
r
P1FM1"M HotKey[index]=0;
GI.=\s HotKeyMask[index]=0;
B QxU~s bRemoved=TRUE;
3{/[gX9 KeyCount--;
))NiX^)8^ break;
<h"07.y }
P,RdYM06 }
#^i.[7p }
:@oy5zib return bRemoved;
,RXfJh }
F4X0DRC,G _DD.#YB</ 7iijATc DLL中的钩子函数如下:
EEI!pi 6C@W6DR3N LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ca6kqh" {
0pW?v:!H BOOL bProcessed=FALSE;
yH<a;@C if(HC_ACTION==nCode)
4+1aW BJ2 {
X6Wj,a if((lParam&0xc0000000)==0xc0000000){// 有键松开
0r/pZ3/ switch(wParam)
U#U' iPy {
^.?5!9U case VK_MENU:
%G43g#pD MaskBits&=~ALTBIT;
P-Up v6J3 break;
8n'"RaLQ8 case VK_CONTROL:
d&G#3}kOb% MaskBits&=~CTRLBIT;
@a]O(S>Ub break;
}<=4A\LZ case VK_SHIFT:
!Zi_4 .(4 MaskBits&=~SHIFTBIT;
Z]^Ooy[pb break;
UB9n7L(@c default: //judge the key and send message
Ms61FmA4 break;
B&},W* p }
{vf4l4J( for(int index=0;index<MAX_KEY;index++){
^1 U<,< if(hCallWnd[index]==NULL)
OL0W'C9oA continue;
*f ;">(`o* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L`6 R {
Oye:V SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9V/:1I0?&0 bProcessed=TRUE;
^hy Y,X }
_*1{fvv0{ }
I[g;p8jr }
@b]?Gg else if((lParam&0xc000ffff)==1){ //有键按下
N*$L#L$* switch(wParam)
V/,@hv`+ {
"tX=^4 case VK_MENU:
BXj]]S2 MaskBits|=ALTBIT;
.?^a|] break;
}@Dgr)*+ case VK_CONTROL:
B\mRHV! MaskBits|=CTRLBIT;
hH3~O`~ break;
G9qN1q~ case VK_SHIFT:
EmFL
%++V MaskBits|=SHIFTBIT;
-:]-g:;/ break;
=ICakh!TO default: //judge the key and send message
;D>*Pzj break;
;&$Nn'~a }
d!z}!
: for(int index=0;index<MAX_KEY;index++){
kuI%0)iZn if(hCallWnd[index]==NULL)
:`X!no; { continue;
nMT"Rp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
WUfPLY_c( {
WJA0 `<~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1[U`,(C1 bProcessed=TRUE;
.W*" C }
xa&5o`>1G }
PN"s^]4 }
oEN^O:9e if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ed\umQ] for(int index=0;index<MAX_KEY;index++){
%K/zVYGm& if(hCallWnd[index]==NULL)
Z!eW_""wp continue;
tQYkH$e`/{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}^a"
>$DU SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
HA# 9y;\ //lParam的意义可看MSDN中WM_KEYDOWN部分
kS)azV }
XcH_Y }
+ _"AF| }
]ur_G`B return CallNextHookEx( hHook, nCode, wParam, lParam );
QHmF,P }
}\Ri:&? HCIS4}lQ 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:
aFf(m- Nfo`Q0\[P BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G.l
~!; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
xk\n F0z N:%
}KAc 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:
Spm7kw 2zN"*Wkn LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
ekV|a1) {
>\s8S}p if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
U9/6F8D1Y1 {
q:a-tdv2 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
d(!g9H SaveBmp();
i[7<l&K] return FALSE;
2M$^|j:[ }
DGrk} …… //其它处理及默认处理
-Ed<Kl }
V
X"!a b2vCr F; sO$X5S C9 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。
G W@g EH~t< 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。
WT_4YM\bz mR3-+dB/ 二、编程步骤
5!V%0EQqw C;jV)hr6P 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";
S(
Vssi|y jBLLx{ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ve&"x Nz< 8%Eemk >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;
Ax{C ^u 7%)KB4(\_ 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;
1wTPT,k u!@(u!Qz 5、 添加代码,编译运行程序。
NR9=V l)K8.(2 三、程序代码
O+ghw1/ < ?{ic2j# ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/O{iL:` #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
b-Xc6f #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
J*nWCL #if _MSC_VER > 1000
1ww#]p`1 #pragma once
}_|qDMk+ #endif // _MSC_VER > 1000
I;GbS` #ifndef __AFXWIN_H__
pr.+r?la] #error include 'stdafx.h' before including this file for PCH
0hv}*NYd #endif
5e|yW0o #include "resource.h" // main symbols
,.,spoV class CHookApp : public CWinApp
2uT"LW/(H {
8D:0Vhx\I public:
D4IP$pAD CHookApp();
oUNuM%g9Dy // Overrides
}[mLtv%& // ClassWizard generated virtual function overrides
b2Oj 1dP1 //{{AFX_VIRTUAL(CHookApp)
Z(wj5;[G public:
HF;$Wf+=J virtual BOOL InitInstance();
~pWV[oUD virtual int ExitInstance();
:N#8|;J1Fl //}}AFX_VIRTUAL
&OXm^f)K //{{AFX_MSG(CHookApp)
#dhce0m // NOTE - the ClassWizard will add and remove member functions here.
y*7{S{9 // DO NOT EDIT what you see in these blocks of generated code !
pSKwXx //}}AFX_MSG
]@wKm1%v DECLARE_MESSAGE_MAP()
5v_vv'~ };
0i4XS*vPv LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
o~`KOe BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
yBkcYHT BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
d3jzGJrU} BOOL InitHotkey();
?, m_q+ BOOL UnInit();
p:?h)'bA< #endif
\PL0-.t, 35 d:r: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ArVW2gL #include "stdafx.h"
U>0~ /o
#include "hook.h"
Qy7 pM8~h #include <windowsx.h>
$i;m9_16 #ifdef _DEBUG
\IX|{]*D #define new DEBUG_NEW
v7b+ #undef THIS_FILE
3{H&{@Q static char THIS_FILE[] = __FILE__;
tb/`*Yl@ #endif
9(pF!}1%\ #define MAX_KEY 100
(;cKv #define CTRLBIT 0x04
c0f8*O4i #define ALTBIT 0x02
JJ4w]Dd4 #define SHIFTBIT 0x01
7!PU}[: #pragma data_seg("shareddata")
+.
tcEbFL HHOOK hHook =NULL;
oZ\zi> Y, UINT nHookCount =0;
]Wg&r Y0 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
z*e`2n#\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
,{Ga7rH*
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`b*x}HP$ static int KeyCount =0;
M~l\rg8 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]=G dAW #pragma data_seg()
r,Tq";N' HINSTANCE hins;
z`:tl7 void VerifyWindow();
F~C7$ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0lLg uBW@ //{{AFX_MSG_MAP(CHookApp)
]6;G# // NOTE - the ClassWizard will add and remove mapping macros here.
*3# RS // DO NOT EDIT what you see in these blocks of generated code!
ZKF
#(G //}}AFX_MSG_MAP
;MH_pE/m END_MESSAGE_MAP()
<Gj]XAoe% avy@)iO7 CHookApp::CHookApp()
on.m
'-s {
KMP[Ledr // TODO: add construction code here,
lXip%6c7
// Place all significant initialization in InitInstance
hka`STK{ }
0w!:YB ,} *0/%R{+S CHookApp theApp;
x\b+B
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
siz:YRur {
aE[:9{<| BOOL bProcessed=FALSE;
kJ"}JRA< if(HC_ACTION==nCode)
vl>_;}W7 {
ks7id[~&iY if((lParam&0xc0000000)==0xc0000000){// Key up
ZmaGp* Wj switch(wParam)
3B5 `Y {
C:ntr=3J case VK_MENU:
so_^%)
gdJ MaskBits&=~ALTBIT;
@r]1;KG break;
1xj w= case VK_CONTROL:
nJR(lXWO MaskBits&=~CTRLBIT;
u85?f break;
f"Kl?IN8 case VK_SHIFT:
6yK"g7 MaskBits&=~SHIFTBIT;
/NUu^ N break;
^ 2LqKo\T default: //judge the key and send message
nVoP:FHH break;
xG:7AGZ$[ }
oH1]-Nl$ for(int index=0;index<MAX_KEY;index++){
n0b{Jg * if(hCallWnd[index]==NULL)
M9Qx F continue;
j"9Zaq_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1O+$"5H {
l
9bg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
PBb'`PV bProcessed=TRUE;
\OVw }
[E;~Y_l }
;Swj`'7 }
Voo_
? else if((lParam&0xc000ffff)==1){ //Key down
N{?Qkkgx switch(wParam)
,U=7#Cf! {
u"-."_ case VK_MENU:
x }i'2 MaskBits|=ALTBIT;
7'RU\0QG break;
)TOKHN case VK_CONTROL:
/vAA]n8 MaskBits|=CTRLBIT;
#K\;)z(? break;
\
m g case VK_SHIFT:
@!mjjeG+1 MaskBits|=SHIFTBIT;
kY#sQz}8 break;
>=YQxm}GJ default: //judge the key and send message
b X4]/4% break;
@T)>akEOt }
YzYj/,?r for(int index=0;index<MAX_KEY;index++)
F32U;fp3 {
0pA>w8 mh if(hCallWnd[index]==NULL)
}0 =gP?.kE continue;
gsVm)mkd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oB%j3aAH {
M7c53fz SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`g'z6~c7n bProcessed=TRUE;
[Y8ot-6 }
hSXZu?/ }
YLid2aF }
Rip[ if(!bProcessed){
_F3=
H]P for(int index=0;index<MAX_KEY;index++){
,S-zY\XB if(hCallWnd[index]==NULL)
Y 016Xg5 continue;
_SqUPTb"u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p1fy)K2{,j SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]Ab$IKY }
g>H\"cUv }
X_#,5t=7 }
"2GssBa return CallNextHookEx( hHook, nCode, wParam, lParam );
pF7S("#R }
&W?
hCr J"
U!j BOOL InitHotkey()
o_?A^u {
>qci$ if(hHook!=NULL){
uY:u[ nHookCount++;
*7K)J8kq return TRUE;
1VB{dgr }
0ae}!LO else
\g:Bg%43h hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
gkld}t*U if(hHook!=NULL)
&I?d(Z=:\ nHookCount++;
kRB2J3Nt. return (hHook!=NULL);
%-3wR@ }
!\|L(Paf BOOL UnInit()
;\gHFG} {
]t;bCD6* if(nHookCount>1){
Te@=8-u- nHookCount--;
fe7DS)U return TRUE;
zwdi$rM5 }
9FmX^t$T BOOL unhooked = UnhookWindowsHookEx(hHook);
qrY]tb^K if(unhooked==TRUE){
d5 U+]g nHookCount=0;
?o_D#gG* hHook=NULL;
ThYHVJ[; }
CChCxB return unhooked;
;(;{~1~ }
pF'M z+X DN: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~jM!8]= {
e18}`<tW- BOOL bAdded=FALSE;
!f*t9 I9Q for(int index=0;index<MAX_KEY;index++){
Cm[^+.=I if(hCallWnd[index]==0){
HsAKz]Mq hCallWnd[index]=hWnd;
E(0 [/N~ HotKey[index]=cKey;
j/w*2+&v HotKeyMask[index]=cMask;
Q#sLIZ8= bAdded=TRUE;
laGIu0s{ KeyCount++;
xkmqf7w break;
q|kkdK|N/Y }
g:fzf>oQ>p }
H(ds return bAdded;
~19&s~ }
O"f|gc)GLz THz=_L6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
IW- BY =C {
K)TMr"j\ BOOL bRemoved=FALSE;
NEcE-7aT for(int index=0;index<MAX_KEY;index++){
zn/b\X/ if(hCallWnd[index]==hWnd){
Q5/BEUkC if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
k{.`=j hCallWnd[index]=NULL;
>kG: MJj HotKey[index]=0;
zM++Z* HotKeyMask[index]=0;
17@#"uT0 bRemoved=TRUE;
5/4q}U3 KeyCount--;
*)um^O break;
QHbjZJ
N }
AOR(1Qyo }
E~eSHJ(oR7 }
p^9u8T4l1 return bRemoved;
LLW
xzu!< }
-%>.Z1uj ql%]t~HR0 void VerifyWindow()
'A#F< x {
_U`1BmTC2 for(int i=0;i<MAX_KEY;i++){
UeN+}`!l if(hCallWnd
!=NULL){ <#No t1R
if(!IsWindow(hCallWnd)){ f>jAu;S
hCallWnd=NULL; 7Un5Y[FZo
HotKey=0; _J-3{a
HotKeyMask=0; `T~~yM)q
KeyCount--; rd!4u14
} g;t>jgX
} G|.5.FK^
} Yp8GW1@
} Nk&$b
Zh3hCxXa
BOOL CHookApp::InitInstance() ahx*Ti/e
{ GHR,KB7 xM
AFX_MANAGE_STATE(AfxGetStaticModuleState()); D?}K|z LQ
hins=AfxGetInstanceHandle(); EmubpUS;
InitHotkey(); H\@@iK=
return CWinApp::InitInstance(); ahqsbNu1
} j;_
>,\
A"R5Fd%6pc
int CHookApp::ExitInstance() Q:sw*7"F
{ 6qkMB|@Ix
VerifyWindow(); $(ei<cAV
UnInit();
9ld'SB:#
return CWinApp::ExitInstance(); */E5<DO
} =U_O;NC
}='1<~0
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file UsBtk
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j5]6CG_
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l[Rl:k!
#if _MSC_VER > 1000 0ntf%#2{
#pragma once = ,^eQZR:
#endif // _MSC_VER > 1000 3v7*@(y
Cz]NSG 5
class CCaptureDlg : public CDialog >r~!'Pd!
{ gQ~X;'
// Construction :;u?TFCRx
public: mQy!*0y
BOOL bTray; Y> f 6
BOOL bRegistered; C6cEt5
BOOL RegisterHotkey(); BaUcmF2Q
UCHAR cKey; B|(M xR6m
UCHAR cMask; cR"?EQ] `N
void DeleteIcon(); wSd o7Lb
void AddIcon(); QocR)aN=+
UINT nCount; Fi_JF;
void SaveBmp(); 2fv`O
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0N(o)WRv
// Dialog Data Kzz]ZO*3
//{{AFX_DATA(CCaptureDlg) !e0~|8
enum { IDD = IDD_CAPTURE_DIALOG }; yttIA/
CComboBox m_Key; tf_<w?~
BOOL m_bControl; J'no{3Ktz
BOOL m_bAlt; d-sK{ZC"y
BOOL m_bShift; |Wzdu2T
CString m_Path; ^E349c-|
CString m_Number; %^ z##7^
//}}AFX_DATA j`pX2S
// ClassWizard generated virtual function overrides -OPJB:7Z
//{{AFX_VIRTUAL(CCaptureDlg) hd)HJb-aR
public: L!
DK2,
virtual BOOL PreTranslateMessage(MSG* pMsg); tj=l!
protected: zs@xw@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }*s%|!{H
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MeXGE
//}}AFX_VIRTUAL 380M&Guh
// Implementation cas5
protected: T0=%RID%=
HICON m_hIcon; \>@QJ
// Generated message map functions c1L0#L/F6"
//{{AFX_MSG(CCaptureDlg) oz[:
T3oE>
virtual BOOL OnInitDialog(); `bx}!;{lx
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z),@YJU"z
afx_msg void OnPaint(); 8C(@a[V
afx_msg HCURSOR OnQueryDragIcon(); 5fqQ;r
virtual void OnCancel(); "hi)p9 _cR
afx_msg void OnAbout(); HE0@`(mCpa
afx_msg void OnBrowse(); 98x&2(N
afx_msg void OnChange(); d iG kwKj
//}}AFX_MSG jdWA)N}kDG
DECLARE_MESSAGE_MAP() dZ"w2ho
};
ROc)LCA
#endif #2\
0#HN
xpjv@P
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aHdXlmL
#include "stdafx.h" 3(n+5~{e
#include "Capture.h" ? <"H Io
#include "CaptureDlg.h" s2rwFj8 |
#include <windowsx.h> qkk!1W
#pragma comment(lib,"hook.lib") ?z$^4u3
#ifdef _DEBUG vjz*B$
#define new DEBUG_NEW Gl@}b\TB
#undef THIS_FILE OELh6R
static char THIS_FILE[] = __FILE__; ~M!s0jT
#endif ]= nM|e
#define IDM_SHELL WM_USER+1 Sdn4y(&TP
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Td"_To@jd
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /3mt=1/~{B
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aH!2zC\:T
class CAboutDlg : public CDialog py8)e7gX=
{ ZN `D!e6
public: pX~X{JTaL)
CAboutDlg();
ndCHWhi
// Dialog Data *[SOz)
//{{AFX_DATA(CAboutDlg) PUJkC
enum { IDD = IDD_ABOUTBOX }; Nxd<#p
//}}AFX_DATA { *&Wc Os
// ClassWizard generated virtual function overrides y.PsC '
//{{AFX_VIRTUAL(CAboutDlg) rE[:j2HF
protected: n?=d)[]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B{ptP4As-
//}}AFX_VIRTUAL ljw(cUM
// Implementation N&]GPl0
protected: /+g9C(['
//{{AFX_MSG(CAboutDlg) ?wpS
//}}AFX_MSG /3`(Ki{
Q
DECLARE_MESSAGE_MAP() 8'}D/4MUr
}; pDloew
,6iXl ch
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U6/$CH<pe
{ 9nrmz>es|-
//{{AFX_DATA_INIT(CAboutDlg) Y"dUxv1Ap
//}}AFX_DATA_INIT X}@'FxIF
} 4u.Fy<+@4M
c> }fy
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &}q;,"
{ 6*uWRjt
CDialog::DoDataExchange(pDX); e"@Ag:r@a
//{{AFX_DATA_MAP(CAboutDlg) Un.u{$po
//}}AFX_DATA_MAP W#@Mx
} I"5VkeIx
ZqK1|/\
rh
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6hX[5?}
//{{AFX_MSG_MAP(CAboutDlg) {/E_l
// No message handlers CqkY_z
//}}AFX_MSG_MAP ~p* \|YC
END_MESSAGE_MAP() s=BJ7iU_68
Y:-O/X
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^0fe:ac;
: CDialog(CCaptureDlg::IDD, pParent) Y$\c_#/]
{ RP1sQ6$
//{{AFX_DATA_INIT(CCaptureDlg) [42EqVR
m_bControl = FALSE; )' 3V4Z&
m_bAlt = FALSE; % r>v^1Vo
m_bShift = FALSE; "k'P
#v{f
m_Path = _T("c:\\"); lc8zF5
m_Number = _T("0 picture captured."); V[RsSZx
=
nCount=0; dtDT^~
bRegistered=FALSE; zHu w[
bTray=FALSE; \zMx~-2oN
//}}AFX_DATA_INIT 5dXDL~/2p
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j
:$Ruy
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .s8u?1b
} IB%Hv]
'n dXM
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Fd(o8z8Q
{ %~$coZY^
CDialog::DoDataExchange(pDX); %%h0 H[5*
//{{AFX_DATA_MAP(CCaptureDlg) YM<F7tp4
DDX_Control(pDX, IDC_KEY, m_Key); J7Y lmi
DDX_Check(pDX, IDC_CONTROL, m_bControl); Bl1^\[#
DDX_Check(pDX, IDC_ALT, m_bAlt); 4u}jkd$]*
DDX_Check(pDX, IDC_SHIFT, m_bShift); o_@6R"|
DDX_Text(pDX, IDC_PATH, m_Path); >5c38D7k)
DDX_Text(pDX, IDC_NUMBER, m_Number); jM'(Qa
//}}AFX_DATA_MAP C=zc6C,
} XRx^4]c
id:6O+\
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iR39lOr
//{{AFX_MSG_MAP(CCaptureDlg) \>N"{T
ON_WM_SYSCOMMAND() L2}p<?f
ON_WM_PAINT() L+N;mI8
ON_WM_QUERYDRAGICON() 5`QN<4?%
ON_BN_CLICKED(ID_ABOUT, OnAbout) .jK,6't^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %SKJ#b
ON_BN_CLICKED(ID_CHANGE, OnChange) og)f?4
//}}AFX_MSG_MAP U3OXO1
END_MESSAGE_MAP() L[aA4`
3^-yw`
BOOL CCaptureDlg::OnInitDialog() 1}XESAX;0
{ u|EHe"V"
CDialog::OnInitDialog(); kBr?Q
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G'c6%;0)
ASSERT(IDM_ABOUTBOX < 0xF000); <<~swN
CMenu* pSysMenu = GetSystemMenu(FALSE); &++tp5
if (pSysMenu != NULL) FL?Ndy"I
{ y??^[ sB
CString strAboutMenu; q2}6lf,J
K
strAboutMenu.LoadString(IDS_ABOUTBOX); jk9/EmV*r
if (!strAboutMenu.IsEmpty()) cOrFe;8-.
{ GX,)~Syw*
pSysMenu->AppendMenu(MF_SEPARATOR); v~`'!N8
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {O"N2W
} oF {u
} -(1GmU5v(
SetIcon(m_hIcon, TRUE); // Set big icon O&@pi-=o
SetIcon(m_hIcon, FALSE); // Set small icon |:)ARH6l#
m_Key.SetCurSel(0); .0b4"0~T6
RegisterHotkey(); ?
e<D +
CMenu* pMenu=GetSystemMenu(FALSE); rcU*6`IWA
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ''3b[<
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dk[MT'DV
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); aYrbB#
return TRUE; // return TRUE unless you set the focus to a control 6)j/"9oY
} qfS
]vc_N
*)xjMTJ%
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;tG@ 6
{ lSK<LytB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) r$<4_*
{ * G0I2
CAboutDlg dlgAbout; -]!zj#&
dlgAbout.DoModal(); F7lzc)
} Qf.]Mw?Bm
else 3#Qek2
{ uB>OS1=
CDialog::OnSysCommand(nID, lParam); 6X[Mn2wYW
} rGUu K0L&
} pZV=Co3!I
MYMg/>f[
void CCaptureDlg::OnPaint() :=e"D;5
{ :V
ZXI#([
if (IsIconic()) Z,JoxK2"
{ E9~}%&
CPaintDC dc(this); // device context for painting PCs`aVZ
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H%G|8,4
// Center icon in client rectangle hyVBQhk
int cxIcon = GetSystemMetrics(SM_CXICON); %pBc]n@_
int cyIcon = GetSystemMetrics(SM_CYICON); 4ZCD@C
CRect rect; >&D}^TMYY
GetClientRect(&rect); Xcw6mpLt
int x = (rect.Width() - cxIcon + 1) / 2; NGL,j\(~7
int y = (rect.Height() - cyIcon + 1) / 2; @*^%^ P
// Draw the icon hzV= 7
dc.DrawIcon(x, y, m_hIcon); ?my2dd,|
} )=5,S~IT
else rPUk%S
{ J e.%-7f
CDialog::OnPaint(); -a`PW
} nk.j7tu
} FfpP<(4
eiJ~1HX)
HCURSOR CCaptureDlg::OnQueryDragIcon() {jOV8SVL
{ GFfZ TA
return (HCURSOR) m_hIcon; 3fd?xhWbN
} 7;3;8Q FX
$9rQ w1#e
void CCaptureDlg::OnCancel() J|.n bSE
{ qj1Fj
if(bTray) 1dl(`=^X
DeleteIcon(); aU?HIIA
CDialog::OnCancel(); &\L\n}i-
} Bh5z4
2f0qfF
void CCaptureDlg::OnAbout() HJ0Rcw%
{ a2SXg A
CAboutDlg dlg; :]uz0s`>
dlg.DoModal(); Wo+^R%K'4
} /y[zOT6
"/0Vvy _|
void CCaptureDlg::OnBrowse() L7PMam
{ W_RN@O
CString str; ,lb >
BROWSEINFO bi; ^2\-zX!bt
char name[MAX_PATH]; ,?(U4pzX
ZeroMemory(&bi,sizeof(BROWSEINFO)); V|j{#;
bi.hwndOwner=GetSafeHwnd(); .M( [n-
bi.pszDisplayName=name; *_H^]wNJG
bi.lpszTitle="Select folder"; v%E~sX&CG
bi.ulFlags=BIF_RETURNONLYFSDIRS; ykD-L^}
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4`'V%)M
if(idl==NULL) M%v 6NxN
return; o[B"J96b
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O~4Q:#^c
str.ReleaseBuffer(); /0(c-Dv
m_Path=str; ^Fg!.X_
if(str.GetAt(str.GetLength()-1)!='\\') oz&RNB.K
m_Path+="\\"; e {805^X}
UpdateData(FALSE); X3R:^ff\
} +Y"HbNz
ra}t#Xt`
void CCaptureDlg::SaveBmp() EFzPt?l
{ 8)XAdAr
CDC dc; {ug*
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Zy=DY
CBitmap bm; 6!Uk c'r
int Width=GetSystemMetrics(SM_CXSCREEN); ()(^B}VK
int Height=GetSystemMetrics(SM_CYSCREEN); 0 LQ%tn
bm.CreateCompatibleBitmap(&dc,Width,Height); CS\8ej}y
CDC tdc; |u_fVQj
tdc.CreateCompatibleDC(&dc); d5#z\E??
CBitmap*pOld=tdc.SelectObject(&bm); XVzsqi*Z
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CG]/.
tdc.SelectObject(pOld); 7=a=@D[
BITMAP btm; 4azqH;i
bm.GetBitmap(&btm); lQ!(lPh
DWORD size=btm.bmWidthBytes*btm.bmHeight; ~ugH2jiB
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y
lhKP;
BITMAPINFOHEADER bih; bA\(oD+:
bih.biBitCount=btm.bmBitsPixel; xwa@h}\#
bih.biClrImportant=0; 46gDoSS
bih.biClrUsed=0; u-@;Q<v$
bih.biCompression=0; NS){D7T
bih.biHeight=btm.bmHeight; z C7 b
bih.biPlanes=1; 7}puj%JS
/
bih.biSize=sizeof(BITMAPINFOHEADER); tu6<>
bih.biSizeImage=size; <6.?:Jj
bih.biWidth=btm.bmWidth; 4P}d/w?'KL
bih.biXPelsPerMeter=0; y/;DA=
bih.biYPelsPerMeter=0; R#4f_9e<Z
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Mw|lEctN0
static int filecount=0; hp$1c
CString name; p
Cgm!t?/
name.Format("pict%04d.bmp",filecount++); 0y3C
/>a
name=m_Path+name; DqA$%b
yyE
BITMAPFILEHEADER bfh; FYIz_GTk
bfh.bfReserved1=bfh.bfReserved2=0; GC7W7B
bfh.bfType=((WORD)('M'<< 8)|'B'); yi*EE%
bfh.bfSize=54+size; hCob^o
bfh.bfOffBits=54; lu;gmWz
CFile bf; *3rp
g
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ gf70 O>E
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )WsR
8tk
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -%TwtO<$']
bf.WriteHuge(lpData,size); -q&7q
bf.Close(); X/FR e[R
nCount++; G6p R?K+
} V)]lca
GlobalFreePtr(lpData); z?W kHQ9
if(nCount==1) \|6Q]3l
m_Number.Format("%d picture captured.",nCount); K6s tkDhb
else h>ZU67-
m_Number.Format("%d pictures captured.",nCount); =\)76xC20
UpdateData(FALSE); T[kS;-x
} &"DD&87N%
{Zo*FZcaX
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B/dJj#
{ 9qm'qx
if(pMsg -> message == WM_KEYDOWN) "rHPcp"m
{ $ZlzS`XF7
if(pMsg -> wParam == VK_ESCAPE) zQoJ8i>
return TRUE; R~BFZF>:
if(pMsg -> wParam == VK_RETURN) _7<G6q2(
return TRUE; {EJ+
} FTu<$`!1L
return CDialog::PreTranslateMessage(pMsg); &Z%'xAOGR
} *1h@Jb34
0u
bf]Z
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SK5__Ix
{ )3^#CD
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d(^3S>V|q
SaveBmp(); ~h$
H@&5
return FALSE; .F3~eas
} VVqpzDoXG
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oxLO[js
CMenu pop; x LGMN)@r
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4iY
<7l8
CMenu*pMenu=pop.GetSubMenu(0); Rp
!Rzl<
pMenu->SetDefaultItem(ID_EXITICON); lL&p?MUp
CPoint pt; <7o@7r'0
GetCursorPos(&pt); 83F]d+n
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u.2^t:A
if(id==ID_EXITICON) h<i.Z7F;tj
DeleteIcon(); 2=$ F*B>9
else if(id==ID_EXIT) )h1 `?q:5
OnCancel(); (zw.?ADPCT
return FALSE; tR(L>ZG{
} vy5I#q(k
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Up*6K =Tny
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V o%GO9b;
AddIcon(); = Q"(9[Az
return res; O^IS:\JX&
} 3
<Zo{;
y1#QP3'Z1
void CCaptureDlg::AddIcon() 2[Xe:)d
{ 06I(01M1
NOTIFYICONDATA data; USH>`3
data.cbSize=sizeof(NOTIFYICONDATA); +1Pu29B0
CString tip; G$s=P
tip.LoadString(IDS_ICONTIP); g_?bWm4br
data.hIcon=GetIcon(0); ,irc=0M(
data.hWnd=GetSafeHwnd(); 4"eeEs h
strcpy(data.szTip,tip); hA+;eXy/
data.uCallbackMessage=IDM_SHELL; +f,I$&d.V
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; r@ba1*y0
data.uID=98; BJjx y0+
Shell_NotifyIcon(NIM_ADD,&data); Pt7C/
qM/
ShowWindow(SW_HIDE); 1~vv<`-
bTray=TRUE; ZVz*1]}
} *}Rd%'
n"<'F4r
void CCaptureDlg::DeleteIcon() X
[;n149o
{ Tvw(Sq};
NOTIFYICONDATA data; y2Vc[o(NP
data.cbSize=sizeof(NOTIFYICONDATA); yppXecFJ
data.hWnd=GetSafeHwnd(); 2>.>q9J(
data.uID=98; l#a*w
Shell_NotifyIcon(NIM_DELETE,&data); Pz-=Eq
ShowWindow(SW_SHOW); wD SSgk
SetForegroundWindow(); i~tps
ShowWindow(SW_SHOWNORMAL); ]#dZLm_
bTray=FALSE; q,]57s
} MT<3OKo?:
0p=
void CCaptureDlg::OnChange() X:W}S/
{ r]&&*:
RegisterHotkey(); <n0j'P>1
} :KsBJ>2ck
4}Hf"L[ l
BOOL CCaptureDlg::RegisterHotkey() Co`:D
{ X
iM{YZ`B
UpdateData(); q[+V6n`Z5
UCHAR mask=0; W |+&K0M
UCHAR key=0; SpZmwa #\
if(m_bControl) g$mqAz<
mask|=4; %Gm4,+8P3o
if(m_bAlt) WiFZY*iu5
mask|=2; >k(AQW5?
if(m_bShift) y|YhDO
mask|=1; =GLMdhD]
key=Key_Table[m_Key.GetCurSel()]; s_76)7
if(bRegistered){ K\$z,}0
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,J'@e+jV
bRegistered=FALSE; qb5IpI{U
} #e6x_o|
cMask=mask; nG"Ae8r
cKey=key; }:+P{
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a!:R_P}7
return bRegistered; Ls NJ3oy
} /7C%m:
E5$uvxCI
四、小结 ;MjOs&1f0K
fwaM ;YN_
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。