Pascal (Lazarus/Delphi)
Pascal (Lazarus/Delphi)
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Chilkat Pascal (Lazarus/Delphi) Downloads
program ChilkatDemo;
// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}
uses
{$IFDEF UNIX}
cthreads,
{$ENDIF}
SysUtils,
CkDllLoader,
Chilkat.StringBuilder,
Chilkat.AuthGoogle,
Chilkat.JsonObject,
Chilkat.Rest;
// ---------------------------------------------------------------------------
procedure RunDemo;
var
success: Boolean;
gAuth: TAuthGoogle;
rest: TRest;
bAutoReconnect: Boolean;
sbPath: TStringBuilder;
allFields: string;
jsonResponse: string;
json: TJsonObject;
wasLastModifiedUserMe: Boolean;
width: Integer;
i: Integer;
numParents: Integer;
numOwners: Integer;
numPermissions: Integer;
begin
success := False;
success := True;
// It requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// This example uses a previously obtained access token having permission for the
// Google Drive scope.
gAuth := TAuthGoogle.Create;
gAuth.AccessToken := 'GOOGLE-DRIVE-ACCESS-TOKEN';
rest := TRest.Create;
// Connect using TLS.
// A single REST object, once connected, can be used for many Google Drive REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
bAutoReconnect := True;
success := rest.Connect('www.googleapis.com',443,True,bAutoReconnect);
// Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth);
// ------------------------------------------------------------------------------
// We need to send a GET request like this:
// GET https://www.googleapis.com/drive/v3/files/fileId
// The fileId is part of the path.
sbPath := TStringBuilder.Create;
sbPath.Append('/drive/v3/files/');
// Assume we previously obtained the fileId for the file of interest...
sbPath.Append('0B53Q6OSTWYolbUF6WS1Gei1oalk');
// Indicate that we want ALL possible fields.
// If no fields are indicated, then only the basic fields are returned.
allFields := 'appProperties,capabilities,contentHints,createdTime,description,explicitlyTrashed,fileExtension,folderColorRgb,fullFileExtension,headRevisionId,iconLink,id,imageMediaMetadata,isAppAuthorized,kind,lastModifyingUser,md5Checksum,mimeType,modifiedByMeTime,modifiedTime,name,originalFilename,ownedByMe,owners,parents,permissions,properties,quotaBytesUsed,shared,sharedWithMeTime,sharingUser,size,spaces,starred,thumbnailLink,trashed,version,videoMediaMetadata,viewedByMe,viewedByMeTime,viewersCanCopyContent,webContentLink,webViewLink,writersCanShare';
rest.AddQueryParam('fields',allFields);
jsonResponse := rest.FullRequestNoBody('GET',sbPath.GetAsString());
if (rest.LastMethodSuccess <> True) then
begin
WriteLn(rest.LastErrorText);
Exit;
end;
// A successful response will have a status code equal to 200.
if (rest.ResponseStatusCode <> 200) then
begin
WriteLn('response status code = ' + rest.ResponseStatusCode);
WriteLn('response status text = ' + rest.ResponseStatusText);
WriteLn('response header: ' + rest.ResponseHeader);
WriteLn('response JSON: ' + jsonResponse);
Exit;
end;
// ---------------------------------------------------
// Sample code for parsing this JSON is shown below...
// ---------------------------------------------------
// A successful response looks like this:
// {
// "kind": "drive#file",
// "id": "0B53Q6OSTWYolbUF6WS1Gei1oalk",
// "name": "penguins.jpg",
// "mimeType": "image/jpeg",
// "starred": false,
// "trashed": false,
// "explicitlyTrashed": false,
// "parents": [
// "0B53Q6OSTWYola296ODZUSm5GYU0"
// ],
// "spaces": [
// "drive"
// ],
// "version": "672",
// "webContentLink": "https://docs.google.com/a/chilkatcloud.com/uc?id=0B53Q6OSTWYolbUF6WS1Gei1oalk&export=download",
// "webViewLink": "https://drive.google.com/a/chilkatcloud.com/file/d/0B53Q6OSTWYolbUF6WS1Gei1oalk/view?usp=drivesdk",
// "iconLink": "https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png",
// "thumbnailLink": "https://lh5.googleusercontent.com/uIV1dJdc8vsAQzaaIInpc9AV55AcdHhpM7fQeI2RN2qbCSnhjK9IDdNQAOTtkvjS9ZObqw=s220",
// "viewedByMe": true,
// "viewedByMeTime": "2016-10-08T12:38:02.258Z",
// "createdTime": "2016-10-08T12:38:02.258Z",
// "modifiedTime": "2016-10-08T12:38:02.258Z",
// "modifiedByMeTime": "2016-10-08T12:38:02.258Z",
// "owners": [
// {
// "kind": "drive#user",
// "displayName": "Matthew Smith",
// "me": true,
// "permissionId": "08366696655122259092",
// "emailAddress": "support@chilkatcloud.com"
// }
// ],
// "lastModifyingUser": {
// "kind": "drive#user",
// "displayName": "Matthew Smith",
// "me": true,
// "permissionId": "08366696655122259092",
// "emailAddress": "support@chilkatcloud.com"
// },
// "shared": false,
// "ownedByMe": true,
// "capabilities": {
// "canEdit": true,
// "canComment": true,
// "canShare": true,
// "canCopy": true,
// "canReadRevisions": true
// },
// "viewersCanCopyContent": true,
// "writersCanShare": true,
// "permissions": [
// {
// "kind": "drive#permission",
// "id": "08366696655122259092",
// "type": "user",
// "emailAddress": "support@chilkatcloud.com",
// "role": "owner",
// "displayName": "Matthew Smith"
// }
// ],
// "originalFilename": "penguins.jpg",
// "fullFileExtension": "jpg",
// "fileExtension": "jpg",
// "md5Checksum": "9d377b10ce778c4938b3c7e2c63a229a",
// "size": "777835",
// "quotaBytesUsed": "777835",
// "headRevisionId": "0B53Q6OSTWYolUUlHVFhHdFlXQ0R1aHZuT0tORTVzc2h5NnZjPQ",
// "imageMediaMetadata": {
// "width": 1024,
// "height": 768,
// "rotation": 0,
// "time": "2009:03:12 13:48:35"
// },
// "isAppAuthorized": false
// }
// Iterate over each file in the response and show the name, id, and mimeType.
json := TJsonObject.Create;
json.Load(jsonResponse);
// Show the full JSON response.
json.EmitCompact := False;
WriteLn(json.Emit());
WriteLn('-');
// Demonstrate how to get pieces of information:
WriteLn('Original Filename: ' + json.StringOf('originalFilename'));
wasLastModifiedUserMe := json.BoolOf('lastModifyingUser.me');
WriteLn('Was Last Modified by Me: ' + wasLastModifiedUserMe);
// Assuming this is an image file...
width := json.IntOf('imageMediaMetadata.width');
WriteLn('Image Width: ' + width);
// Iterate over parents...
numParents := json.SizeOfArray('parents');
i := 0;
while i < numParents do
begin
json.I := i;
WriteLn('Parent ' + i + ': ' + json.StringOf('parents[i]'));
i := i + 1;
end;
// Iterate over owners...
numOwners := json.SizeOfArray('owners');
i := 0;
while i < numOwners do
begin
json.I := i;
WriteLn('Owner ' + i + ': kind=' + json.StringOf('owners[i].kind') + ' displayName=' + json.StringOf('owners[i].displayName'));
i := i + 1;
end;
// Iterate over permissions...
numPermissions := json.SizeOfArray('permissions');
i := 0;
while i < numPermissions do
begin
json.I := i;
WriteLn('Permission ' + i + ': kind=' + json.StringOf('permissions[i].kind') + ' id=' + json.StringOf('permissions[i].id'));
i := i + 1;
end;
gAuth.Free;
rest.Free;
sbPath.Free;
json.Free;
end;
// ---------------------------------------------------------------------------
begin
try
RunDemo;
except
on E: Exception do
WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
end;
WriteLn;
{$IFDEF MSWINDOWS}
WriteLn('Press Enter to exit...');
ReadLn;
{$ENDIF}
end.